mirror of https://github.com/postgres/postgres
Gene Selkov's SEG datatype (GiST example code)
This commit is contained in:
Tom Lane
parent
9892ddf5ee
commit
a3694b420f
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#
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# $Header: /cvsroot/pgsql/contrib/seg/Makefile,v 1.1 2000/12/11 20:40:33 tgl Exp $
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#
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subdir = contrib/seg
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top_builddir = ../..
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include $(top_builddir)/src/Makefile.global
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# override libdir to install shlib in contrib not main directory
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libdir := $(libdir)/contrib
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# shared library parameters
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NAME= seg
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SO_MAJOR_VERSION= 1
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SO_MINOR_VERSION= 0
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override CPPFLAGS += -I$(srcdir)
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OBJS= seg.o segparse.o segscan.o buffer.o
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all: all-lib $(NAME).sql
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# Shared library stuff
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include $(top_srcdir)/src/Makefile.shlib
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segparse.c segparse.h: segparse.y
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$(YACC) -d $(YFLAGS) -p seg_yy $<
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mv -f y.tab.c segparse.c
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mv -f y.tab.h segparse.h
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segscan.c: segscan.l
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ifdef FLEX
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$(FLEX) $(FLEXFLAGS) -Pseg_yy -o'$@' $<
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else
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@$(missing) flex $< $@
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endif
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$(NAME).sql: $(NAME).sql.in
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sed -e 's:MODULE_PATHNAME:$(libdir)/$(shlib):g' < $< > $@
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.PHONY: submake
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submake:
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$(MAKE) -C $(top_builddir)/src/test/regress pg_regress
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# against installed postmaster
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installcheck: submake
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$(top_builddir)/src/test/regress/pg_regress seg
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# in-tree test doesn't work yet (no way to install my shared library)
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#check: all submake
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# $(top_builddir)/src/test/regress/pg_regress --temp-install \
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# --top-builddir=$(top_builddir) seg
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check:
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@echo "'make check' is not supported."
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@echo "Do 'make install', then 'make installcheck' instead."
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install: all installdirs install-lib
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$(INSTALL_DATA) $(srcdir)/README.$(NAME) $(docdir)/contrib
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$(INSTALL_DATA) $(NAME).sql $(datadir)/contrib
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installdirs:
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$(mkinstalldirs) $(docdir)/contrib $(datadir)/contrib $(libdir)
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uninstall: uninstall-lib
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rm -f $(docdir)/contrib/README.$(NAME) $(datadir)/contrib/$(NAME).sql
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clean distclean maintainer-clean: clean-lib
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rm -f segparse.c segparse.h segscan.c
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rm -f y.tab.c y.tab.h $(OBJS) $(NAME).sql
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# things created by various check targets
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rm -rf results tmp_check log
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rm -f regression.diffs regression.out regress.out run_check.out
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ifeq ($(PORTNAME), win)
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rm -f regress.def
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endif
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depend dep:
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$(CC) -MM $(CFLAGS) *.c >depend
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ifeq (depend,$(wildcard depend))
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include depend
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endif
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This directory contains the code for the user-defined type,
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SEG, representing laboratory measurements as floating point
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intervals.
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RATIONALE
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=========
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The geometry of measurements is usually more complex than that of a
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point in a numeric continuum. A measurement is usually a segment of
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that continuum with somewhat fuzzy limits. The measurements come out
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as intervals because of uncertainty and randomness, as well as because
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the value being measured may naturally be an interval indicating some
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condition, such as the temperature range of stability of a protein.
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Using just common sense, it appears more convenient to store such data
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as intervals, rather than pairs of numbers. In practice, it even turns
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out more efficient in most applications.
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Further along the line of common sense, the fuzziness of the limits
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suggests that the use of traditional numeric data types leads to a
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certain loss of information. Consider this: your instrument reads
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6.50, and you input this reading into the database. What do you get
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when you fetch it? Watch:
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test=> select 6.50 as "pH";
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pH
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---
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6.5
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(1 row)
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In the world of measurements, 6.50 is not the same as 6.5. It may
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sometimes be critically different. The experimenters usually write
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down (and publish) the digits they trust. 6.50 is actually a fuzzy
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interval contained within a bigger and even fuzzier interval, 6.5,
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with their center points being (probably) the only common feature they
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share. We definitely do not want such different data items to appear the
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same.
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Conclusion? It is nice to have a special data type that can record the
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limits of an interval with arbitrarily variable precision. Variable in
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a sense that each data element records its own precision.
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Check this out:
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test=> select '6.25 .. 6.50'::seg as "pH";
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pH
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------------
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6.25 .. 6.50
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(1 row)
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FILES
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=====
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Makefile building instructions for the shared library
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README.seg the file you are now reading
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buffer.c global variables and buffer access utilities
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shared between the parser (segparse.y) and the
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scanner (segscan.l)
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buffer.h function prototypes for buffer.c
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seg.c the implementation of this data type in c
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seg.sql.in SQL code needed to register this type with postgres
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(transformed to seg.sql by make)
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segdata.h the data structure used to store the segments
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segparse.y the grammar file for the parser (used by seg_in() in seg.c)
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segscan.l scanner rules (used by seg_yyparse() in segparse.y)
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seg-validate.pl a simple input validation script. It is probably a
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little stricter than the type itself: for example,
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it rejects '22 ' because of the trailing space. Use
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as a filter to discard bad values from a single column;
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redirect to /dev/null to see the offending input
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sort-segments.pl a script to sort the tables having a SEG type column
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INSTALLATION
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============
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To install the type, run
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make
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make install
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For this to work, make sure that:
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. the seg source directory is in the postgres contrib directory
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. the user running "make install" has postgres administrative authority
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. this user's environment defines the PGLIB and PGDATA variables and has
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postgres binaries in the PATH.
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This only installs the type implementation and documentation. To make the
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type available in any particular database, do
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psql -d databasename < seg.sql
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If you install the type in the template1 database, all subsequently created
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databases will inherit it.
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To test the new type, after "make install" do
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make installcheck
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If it fails, examine the file regression.diffs to find out the reason (the
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test code is a direct adaptation of the regression tests from the main
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source tree).
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SYNTAX
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======
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The external representation of an interval is formed using one or two
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floating point numbers joined by the range operator ('..' or '...').
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Optional certainty indicators (<, > and ~) are ignored by the internal
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logics, but are retained in the data.
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Grammar
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-------
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rule 1 seg -> boundary PLUMIN deviation
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rule 2 seg -> boundary RANGE boundary
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rule 3 seg -> boundary RANGE
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rule 4 seg -> RANGE boundary
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rule 5 seg -> boundary
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rule 6 boundary -> FLOAT
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rule 7 boundary -> EXTENSION FLOAT
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rule 8 deviation -> FLOAT
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Tokens
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------
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RANGE (\.\.)(\.)?
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PLUMIN \'\+\-\'
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integer [+-]?[0-9]+
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real [+-]?[0-9]+\.[0-9]+
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FLOAT ({integer}|{real})([eE]{integer})?
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EXTENSION [<>~]
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Examples of valid SEG representations:
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--------------------------------------
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Any number (rules 5,6) -- creates a zero-length segment (a point,
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if you will)
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~5.0 (rules 5,7) -- creates a zero-length segment AND records
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'~' in the data. This notation reads 'approximately 5.0',
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but its meaning is not recognized by the code. It is ignored
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until you get the value back. View it is a short-hand comment.
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<5.0 (rules 5,7) -- creates a point at 5.0; '<' is ignored but
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is preserved as a comment
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>5.0 (rules 5,7) -- creates a point at 5.0; '>' is ignored but
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is preserved as a comment
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5(+-)0.3
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5'+-'0.3 (rules 1,8) -- creates an interval '4.7..5.3'. As of this
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writing (02/09/2000), this mechanism isn't completely accurate
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in determining the number of significant digits for the
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boundaries. For example, it adds an extra digit to the lower
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boundary if the resulting interval includes a power of ten:
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template1=> select '10(+-)1'::seg as seg;
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seg
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---------
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9.0 .. 11 -- should be: 9 .. 11
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Also, the (+-) notation is not preserved: 'a(+-)b' will
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always be returned as '(a-b) .. (a+b)'. The purpose of this
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notation is to allow input from certain data sources without
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conversion.
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50 .. (rule 3) -- everything that is greater than or equal to 50
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.. 0 (rule 4) -- everything that is less than or equal to 0
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1.5e-2 .. 2E-2 (rule 2) -- creates an interval (0.015 .. 0.02)
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1 ... 2 The same as 1...2, or 1 .. 2, or 1..2 (space is ignored).
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Because of the widespread use of '...' in the data sources,
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I decided to stick to is as a range operator. This, and
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also the fact that the white space around the range operator
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is ignored, creates a parsing conflict with numeric constants
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starting with a decimal point.
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Examples of invalid SEG input:
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------------------------------
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.1e7 should be: 0.1e7
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.1 .. .2 should be: 0.1 .. 0.2
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2.4 E4 should be: 2.4E4
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The following, although it is not a syntax error, is disallowed to improve
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the sanity of the data:
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5 .. 2 should be: 2 .. 5
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PRECISION
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=========
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The segments are stored internally as pairs of 32-bit floating point
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numbers. It means that the numbers with more than 7 significant digits
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will be truncated.
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The numbers with less than or exactly 7 significant digits retain their
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original precision. That is, if your query returns 0.00, you will be
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sure that the trailing zeroes are not the artifacts of formatting: they
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reflect the precision of the original data. The number of leading
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zeroes does not affect precision: the value 0.0067 is considered to
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have just 2 significant digits.
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USAGE
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=====
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The access method for SEG is a GiST (gist_seg_ops), which is a
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generalization of R-tree. GiSTs allow the postgres implementation of
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R-tree, originally encoded to support 2-D geometric types such as
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boxes and polygons, to be used with any data type whose data domain
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can be partitioned using the concepts of containment, intersection and
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equality. In other words, everything that can intersect or contain
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its own kind can be indexed with a GiST. That includes, among other
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things, all geometric data types, regardless of their dimensionality
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(see also contrib/cube).
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The operators supported by the GiST access method include:
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[a, b] << [c, d] Is left of
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The left operand, [a, b], occurs entirely to the left of the
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right operand, [c, d], on the axis (-inf, inf). It means,
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[a, b] << [c, d] is true if b < c and false otherwise
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[a, b] >> [c, d] Is right of
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[a, b] is occurs entirely to the right of [c, d].
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[a, b] >> [c, d] is true if b > c and false otherwise
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[a, b] &< [c, d] Over left
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The segment [a, b] overlaps the segment [c, d] in such a way
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that a <= c <= b and b <= d
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[a, b] &> [c, d] Over right
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The segment [a, b] overlaps the segment [c, d] in such a way
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that a > c and b <= c <= d
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[a, b] = [c, d] Same as
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The segments [a, b] and [c, d] are identical, that is, a == b
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and c == d
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[a, b] @ [c, d] Contains
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The segment [a, b] contains the segment [c, d], that is,
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a <= c and b >= d
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[a, b] @ [c, d] Contained in
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The segment [a, b] is contained in [c, d], that is,
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a >= c and b <= d
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Although the mnemonics of the following operators is questionable, I
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preserved them to maintain visual consistency with other geometric
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data types defined in Postgres.
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Other operators:
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[a, b] < [c, d] Less than
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[a, b] > [c, d] Greater than
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These operators do not make a lot of sense for any practical
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purpose but sorting. These operators first compare (a) to (c),
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and if these are equal, compare (b) to (d). That accounts for
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reasonably good sorting in most cases, which is useful if
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you want to use ORDER BY with this type
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There are a few other potentially useful functions defined in seg.c
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that vanished from the schema because I stopped using them. Some of
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these were meant to support type casting. Let me know if I was wrong:
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I will then add them back to the schema. I would also appreciate
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other ideas that would enhance the type and make it more useful.
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For examples of usage, see sql/seg.sql
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NOTE: The performance of an R-tree index can largely depend on the
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order of input values. It may be very helpful to sort the input table
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on the SEG column (see the script sort-segments.pl for an example)
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CREDITS
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=======
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My thanks are primarily to Prof. Joe Hellerstein
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(http://db.cs.berkeley.edu/~jmh/) for elucidating the gist of the GiST
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(http://gist.cs.berkeley.edu/). I am also grateful to all postgres
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developers, present and past, for enabling myself to create my own
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world and live undisturbed in it. And I would like to acknowledge my
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gratitude to Argonne Lab and to the U.S. Department of Energy for the
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years of faithful support of my database research.
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------------------------------------------------------------------------
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Gene Selkov, Jr.
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Computational Scientist
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Mathematics and Computer Science Division
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Argonne National Laboratory
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9700 S Cass Ave.
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Building 221
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Argonne, IL 60439-4844
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selkovjr@mcs.anl.gov
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/* This module defines the parse buffer and routines for setting/reading it */
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#include "postgres.h"
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#include "utils/elog.h"
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static char * PARSE_BUFFER;
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static char * PARSE_BUFFER_PTR;
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static unsigned int PARSE_BUFFER_SIZE;
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static unsigned int SCANNER_POS;
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void set_parse_buffer( char* s );
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void reset_parse_buffer( void );
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int read_parse_buffer( void );
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char * parse_buffer( void );
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char * parse_buffer_ptr( void );
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unsigned int parse_buffer_curr_char( void );
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unsigned int parse_buffer_size( void );
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unsigned int parse_buffer_pos( void );
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extern void seg_flush_scanner_buffer(void); /* defined in segscan.l */
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void set_parse_buffer( char* s )
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{
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PARSE_BUFFER = s;
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PARSE_BUFFER_SIZE = strlen(s);
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if ( PARSE_BUFFER_SIZE == 0 ) {
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elog(ERROR, "seg_in: can't parse an empty string");
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}
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PARSE_BUFFER_PTR = PARSE_BUFFER;
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SCANNER_POS = 0;
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}
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void reset_parse_buffer( void )
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{
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PARSE_BUFFER_PTR = PARSE_BUFFER;
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SCANNER_POS = 0;
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seg_flush_scanner_buffer();
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}
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int read_parse_buffer( void )
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{
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int c;
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/*
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c = *PARSE_BUFFER_PTR++;
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SCANNER_POS++;
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*/
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c = PARSE_BUFFER[SCANNER_POS];
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if(SCANNER_POS < PARSE_BUFFER_SIZE)
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SCANNER_POS++;
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return c;
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}
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char * parse_buffer( void )
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{
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return PARSE_BUFFER;
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}
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unsigned int parse_buffer_curr_char( void )
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{
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return PARSE_BUFFER[SCANNER_POS];
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}
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char * parse_buffer_ptr( void )
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{
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return PARSE_BUFFER_PTR;
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}
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unsigned int parse_buffer_pos( void )
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{
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return SCANNER_POS;
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}
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unsigned int parse_buffer_size( void )
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{
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return PARSE_BUFFER_SIZE;
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}
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@ -0,0 +1,8 @@
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extern void set_parse_buffer( char* s );
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extern void reset_parse_buffer( void );
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extern int read_parse_buffer( void );
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extern char * parse_buffer( void );
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extern char * parse_buffer_ptr( void );
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extern unsigned int parse_buffer_curr_char( void );
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extern unsigned int parse_buffer_pos( void );
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extern unsigned int parse_buffer_size( void );
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File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,42 @@
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#!/usr/bin/perl
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$integer = '[+-]?[0-9]+';
|
||||
$real = '[+-]?[0-9]+\.[0-9]+';
|
||||
|
||||
$RANGE = '(\.\.)(\.)?';
|
||||
$PLUMIN = q(\'\+\-\');
|
||||
$FLOAT = "(($integer)|($real))([eE]($integer))?";
|
||||
$EXTENSION = '<|>|~';
|
||||
|
||||
$boundary = "($EXTENSION)?$FLOAT";
|
||||
$deviation = $FLOAT;
|
||||
|
||||
$rule_1 = $boundary . $PLUMIN . $deviation;
|
||||
$rule_2 = $boundary . $RANGE . $boundary;
|
||||
$rule_3 = $boundary . $RANGE;
|
||||
$rule_4 = $RANGE . $boundary;
|
||||
$rule_5 = $boundary;
|
||||
|
||||
|
||||
print "$rule_5\n";
|
||||
while (<>) {
|
||||
# s/ +//g;
|
||||
if ( /^($rule_1)$/ ) {
|
||||
print;
|
||||
}
|
||||
elsif ( /^($rule_2)$/ ) {
|
||||
print;
|
||||
}
|
||||
elsif ( /^($rule_3)$/ ) {
|
||||
print;
|
||||
}
|
||||
elsif ( /^($rule_4)$/ ) {
|
||||
print;
|
||||
}
|
||||
elsif ( /^($rule_5)$/ ) {
|
||||
print;
|
||||
}
|
||||
else {
|
||||
print STDERR "error in $_\n";
|
||||
}
|
||||
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,361 @@
|
|||
-- Create the user-defined type for 1-D floating point intervals (seg)
|
||||
--
|
||||
BEGIN TRANSACTION;
|
||||
|
||||
CREATE FUNCTION seg_in(opaque)
|
||||
RETURNS opaque
|
||||
AS 'MODULE_PATHNAME'
|
||||
LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION seg_out(opaque)
|
||||
RETURNS opaque
|
||||
AS 'MODULE_PATHNAME'
|
||||
LANGUAGE 'c';
|
||||
|
||||
CREATE TYPE seg (
|
||||
internallength = 12,
|
||||
input = seg_in,
|
||||
output = seg_out
|
||||
);
|
||||
|
||||
COMMENT ON TYPE seg IS
|
||||
'floating point interval ''FLOAT .. FLOAT'', ''.. FLOAT'', ''FLOAT ..'' or ''FLOAT''';
|
||||
|
||||
--
|
||||
-- External C-functions for R-tree methods
|
||||
--
|
||||
|
||||
-- Left/Right methods
|
||||
|
||||
CREATE FUNCTION seg_over_left(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_over_left(seg, seg) IS
|
||||
'is over and left of';
|
||||
|
||||
CREATE FUNCTION seg_over_right(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_over_right(seg, seg) IS
|
||||
'is over and right of';
|
||||
|
||||
CREATE FUNCTION seg_left(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_left(seg, seg) IS
|
||||
'is left of';
|
||||
|
||||
CREATE FUNCTION seg_right(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_right(seg, seg) IS
|
||||
'is right of';
|
||||
|
||||
|
||||
-- Comparison methods
|
||||
|
||||
CREATE FUNCTION seg_lt(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_lt(seg, seg) IS
|
||||
'less than';
|
||||
|
||||
CREATE FUNCTION seg_le(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_le(seg, seg) IS
|
||||
'less than or equal';
|
||||
|
||||
CREATE FUNCTION seg_gt(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_gt(seg, seg) IS
|
||||
'greater than';
|
||||
|
||||
CREATE FUNCTION seg_ge(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_ge(seg, seg) IS
|
||||
'greater than or equal';
|
||||
|
||||
CREATE FUNCTION seg_contains(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_contains(seg, seg) IS
|
||||
'contains';
|
||||
|
||||
CREATE FUNCTION seg_contained(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_contained(seg, seg) IS
|
||||
'contained in';
|
||||
|
||||
CREATE FUNCTION seg_overlap(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_overlap(seg, seg) IS
|
||||
'overlaps';
|
||||
|
||||
CREATE FUNCTION seg_same(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_same(seg, seg) IS
|
||||
'same as';
|
||||
|
||||
CREATE FUNCTION seg_different(seg, seg) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
COMMENT ON FUNCTION seg_different(seg, seg) IS
|
||||
'different';
|
||||
|
||||
-- support routines for indexing
|
||||
|
||||
CREATE FUNCTION seg_union(seg, seg) RETURNS seg
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION seg_inter(seg, seg) RETURNS seg
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION seg_size(seg) RETURNS float4
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
-- miscellaneous
|
||||
|
||||
CREATE FUNCTION seg_upper(seg) RETURNS float4
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION seg_lower(seg) RETURNS float4
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
|
||||
--
|
||||
-- OPERATORS
|
||||
--
|
||||
|
||||
CREATE OPERATOR < (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_lt,
|
||||
COMMUTATOR = '>', NEGATOR = '>=',
|
||||
RESTRICT = scalarltsel, JOIN = scalarltjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR <= (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_le,
|
||||
COMMUTATOR = '>=', NEGATOR = '>',
|
||||
RESTRICT = scalarltsel, JOIN = scalarltjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR > (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_gt,
|
||||
COMMUTATOR = '<', NEGATOR = '<=',
|
||||
RESTRICT = scalargtsel, JOIN = scalargtjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR >= (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_ge,
|
||||
COMMUTATOR = '<=', NEGATOR = '<',
|
||||
RESTRICT = scalargtsel, JOIN = scalargtjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR << (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_left,
|
||||
COMMUTATOR = '>>',
|
||||
RESTRICT = positionsel, JOIN = positionjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR &< (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_over_left,
|
||||
COMMUTATOR = '&>',
|
||||
RESTRICT = positionsel, JOIN = positionjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR && (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_overlap,
|
||||
COMMUTATOR = '&&',
|
||||
RESTRICT = positionsel, JOIN = positionjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR &> (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_over_right,
|
||||
COMMUTATOR = '&<',
|
||||
RESTRICT = positionsel, JOIN = positionjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR >> (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_right,
|
||||
COMMUTATOR = '<<',
|
||||
RESTRICT = positionsel, JOIN = positionjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR = (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_same,
|
||||
COMMUTATOR = '=', NEGATOR = '<>',
|
||||
RESTRICT = eqsel, JOIN = eqjoinsel,
|
||||
SORT1 = '<', SORT2 = '<'
|
||||
);
|
||||
|
||||
CREATE OPERATOR <> (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_different,
|
||||
COMMUTATOR = '<>', NEGATOR = '=',
|
||||
RESTRICT = neqsel, JOIN = neqjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR @ (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_contains,
|
||||
COMMUTATOR = '~',
|
||||
RESTRICT = contsel, JOIN = contjoinsel
|
||||
);
|
||||
|
||||
CREATE OPERATOR ~ (
|
||||
LEFTARG = seg, RIGHTARG = seg, PROCEDURE = seg_contained,
|
||||
COMMUTATOR = '@',
|
||||
RESTRICT = contsel, JOIN = contjoinsel
|
||||
);
|
||||
|
||||
|
||||
-- define the GiST support methods
|
||||
CREATE FUNCTION gseg_consistent(opaque,seg,int4) RETURNS bool
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION gseg_compress(opaque) RETURNS opaque
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION gseg_decompress(opaque) RETURNS opaque
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION gseg_penalty(opaque,opaque,opaque) RETURNS opaque
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION gseg_picksplit(opaque, opaque) RETURNS opaque
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION gseg_union(bytea, opaque) RETURNS seg
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
CREATE FUNCTION gseg_same(seg, seg, opaque) RETURNS opaque
|
||||
AS 'MODULE_PATHNAME' LANGUAGE 'c';
|
||||
|
||||
|
||||
-- register the default opclass for indexing
|
||||
INSERT INTO pg_opclass (opcname, opcdeftype)
|
||||
SELECT 'gist_seg_ops', oid
|
||||
FROM pg_type
|
||||
WHERE typname = 'seg';
|
||||
|
||||
|
||||
-- get the comparators for segments and store them in a tmp table
|
||||
SELECT o.oid AS opoid, o.oprname
|
||||
INTO TABLE seg_ops_tmp
|
||||
FROM pg_operator o, pg_type t
|
||||
WHERE o.oprleft = t.oid and o.oprright = t.oid
|
||||
and t.typname = 'seg';
|
||||
|
||||
-- make sure we have the right operators
|
||||
-- SELECT * from seg_ops_tmp;
|
||||
|
||||
-- using the tmp table, generate the amop entries
|
||||
|
||||
-- seg_left
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 1
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '<<';
|
||||
|
||||
-- seg_overleft
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 2
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '&<';
|
||||
|
||||
-- seg_overlap
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 3
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '&&';
|
||||
|
||||
-- seg_overright
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 4
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '&>';
|
||||
|
||||
-- seg_right
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 5
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '>>';
|
||||
|
||||
-- seg_same
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 6
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '=';
|
||||
|
||||
-- seg_contains
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 7
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '@';
|
||||
|
||||
-- seg_contained
|
||||
INSERT INTO pg_amop (amopid, amopclaid, amopopr, amopstrategy)
|
||||
SELECT am.oid, opcl.oid, c.opoid, 8
|
||||
FROM pg_am am, pg_opclass opcl, seg_ops_tmp c
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and c.oprname = '~';
|
||||
|
||||
DROP TABLE seg_ops_tmp;
|
||||
|
||||
|
||||
-- add the entries to amproc for the support methods
|
||||
-- note the amprocnum numbers associated with each are specific!
|
||||
|
||||
INSERT INTO pg_amproc (amid, amopclaid, amproc, amprocnum)
|
||||
SELECT am.oid, opcl.oid, pro.oid, 1
|
||||
FROM pg_am am, pg_opclass opcl, pg_proc pro
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and proname = 'gseg_consistent';
|
||||
|
||||
INSERT INTO pg_amproc (amid, amopclaid, amproc, amprocnum)
|
||||
SELECT am.oid, opcl.oid, pro.oid, 2
|
||||
FROM pg_am am, pg_opclass opcl, pg_proc pro
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and proname = 'gseg_union';
|
||||
|
||||
INSERT INTO pg_amproc (amid, amopclaid, amproc, amprocnum)
|
||||
SELECT am.oid, opcl.oid, pro.oid, 3
|
||||
FROM pg_am am, pg_opclass opcl, pg_proc pro
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and proname = 'gseg_compress';
|
||||
|
||||
INSERT INTO pg_amproc (amid, amopclaid, amproc, amprocnum)
|
||||
SELECT am.oid, opcl.oid, pro.oid, 4
|
||||
FROM pg_am am, pg_opclass opcl, pg_proc pro
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and proname = 'gseg_decompress';
|
||||
|
||||
INSERT INTO pg_amproc (amid, amopclaid, amproc, amprocnum)
|
||||
SELECT am.oid, opcl.oid, pro.oid, 5
|
||||
FROM pg_am am, pg_opclass opcl, pg_proc pro
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and proname = 'gseg_penalty';
|
||||
|
||||
INSERT INTO pg_amproc (amid, amopclaid, amproc, amprocnum)
|
||||
SELECT am.oid, opcl.oid, pro.oid, 6
|
||||
FROM pg_am am, pg_opclass opcl, pg_proc pro
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and proname = 'gseg_picksplit';
|
||||
|
||||
INSERT INTO pg_amproc (amid, amopclaid, amproc, amprocnum)
|
||||
SELECT am.oid, opcl.oid, pro.oid, 7
|
||||
FROM pg_am am, pg_opclass opcl, pg_proc pro
|
||||
WHERE amname = 'gist' and opcname = 'gist_seg_ops'
|
||||
and proname = 'gseg_same';
|
||||
|
||||
END TRANSACTION;
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
typedef struct SEG {
|
||||
float lower;
|
||||
float upper;
|
||||
char l_sigd;
|
||||
char u_sigd;
|
||||
char l_ext;
|
||||
char u_ext;
|
||||
} SEG;
|
||||
|
|
@ -0,0 +1,183 @@
|
|||
%{
|
||||
#define YYERROR_VERBOSE
|
||||
#define YYPARSE_PARAM result /* need this to pass a pointer (void *) to yyparse */
|
||||
|
||||
#include <string.h>
|
||||
#include <stdlib.h>
|
||||
#include <math.h>
|
||||
#include "segdata.h"
|
||||
#include "buffer.h"
|
||||
|
||||
#include "postgres.h"
|
||||
#include "utils/elog.h"
|
||||
|
||||
#undef yylex /* falure to redefine yylex will result in calling the */
|
||||
#define yylex seg_yylex /* wrong scanner when running inside postgres backend */
|
||||
|
||||
extern int errno;
|
||||
extern int yylex(); /* defined as seg_yylex in segscan.c */
|
||||
extern int significant_digits( char *str ); /* defined in seg.c */
|
||||
|
||||
int seg_yyerror( char *msg );
|
||||
int seg_yyparse( void *result );
|
||||
|
||||
float seg_atof( char *value );
|
||||
|
||||
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
|
||||
#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
|
||||
#define ABS(X) ((X) < 0 ? (-X) : (X))
|
||||
|
||||
long threshold;
|
||||
char strbuf[25] = {
|
||||
'0', '0', '0', '0', '0',
|
||||
'0', '0', '0', '0', '0',
|
||||
'0', '0', '0', '0', '0',
|
||||
'0', '0', '0', '0', '0',
|
||||
'0', '0', '0', '0', '\0'
|
||||
};
|
||||
|
||||
%}
|
||||
|
||||
/* BISON Declarations */
|
||||
%union {
|
||||
struct BND {
|
||||
float val;
|
||||
char ext;
|
||||
char sigd;
|
||||
} bnd;
|
||||
char * text;
|
||||
}
|
||||
%token <text> FLOAT
|
||||
%token <text> RANGE
|
||||
%token <text> PLUMIN
|
||||
%token <text> EXTENSION
|
||||
%type <bnd> boundary
|
||||
%type <bnd> deviation
|
||||
%start range
|
||||
|
||||
/* Grammar follows */
|
||||
%%
|
||||
|
||||
|
||||
range:
|
||||
boundary PLUMIN deviation {
|
||||
((SEG *)result)->lower = $1.val - $3.val;
|
||||
((SEG *)result)->upper = $1.val + $3.val;
|
||||
sprintf(strbuf, "%g", ((SEG *)result)->lower);
|
||||
((SEG *)result)->l_sigd = MAX(MIN(6, significant_digits(strbuf)), MAX($1.sigd, $3.sigd));
|
||||
sprintf(strbuf, "%g", ((SEG *)result)->upper);
|
||||
((SEG *)result)->u_sigd = MAX(MIN(6, significant_digits(strbuf)), MAX($1.sigd, $3.sigd));
|
||||
((SEG *)result)->l_ext = '\0';
|
||||
((SEG *)result)->u_ext = '\0';
|
||||
}
|
||||
|
|
||||
boundary RANGE boundary {
|
||||
((SEG *)result)->lower = $1.val;
|
||||
((SEG *)result)->upper = $3.val;
|
||||
if ( ((SEG *)result)->lower > ((SEG *)result)->upper ) {
|
||||
reset_parse_buffer();
|
||||
elog(ERROR, "swapped boundaries: %g is greater than %g", ((SEG *)result)->lower, ((SEG *)result)->upper );
|
||||
YYERROR;
|
||||
}
|
||||
((SEG *)result)->l_sigd = $1.sigd;
|
||||
((SEG *)result)->u_sigd = $3.sigd;
|
||||
((SEG *)result)->l_ext = ( $1.ext ? $1.ext : '\0' );
|
||||
((SEG *)result)->u_ext = ( $3.ext ? $3.ext : '\0' );
|
||||
}
|
||||
|
|
||||
boundary RANGE {
|
||||
((SEG *)result)->lower = $1.val;
|
||||
((SEG *)result)->upper = HUGE;
|
||||
((SEG *)result)->l_sigd = $1.sigd;
|
||||
((SEG *)result)->u_sigd = 0;
|
||||
((SEG *)result)->l_ext = ( $1.ext ? $1.ext : '\0' );
|
||||
((SEG *)result)->u_ext = '-';
|
||||
}
|
||||
;
|
||||
|
|
||||
RANGE boundary {
|
||||
((SEG *)result)->lower = -HUGE;
|
||||
((SEG *)result)->upper = $2.val;
|
||||
((SEG *)result)->l_sigd = 0;
|
||||
((SEG *)result)->u_sigd = $2.sigd;
|
||||
((SEG *)result)->l_ext = '-';
|
||||
((SEG *)result)->u_ext = ( $2.ext ? $2.ext : '\0' );
|
||||
}
|
||||
|
|
||||
boundary {
|
||||
((SEG *)result)->lower = ((SEG *)result)->upper = $1.val;
|
||||
((SEG *)result)->l_sigd = ((SEG *)result)->u_sigd = $1.sigd;
|
||||
((SEG *)result)->l_ext = ((SEG *)result)->u_ext = ( $1.ext ? $1.ext : '\0' );
|
||||
}
|
||||
;
|
||||
|
||||
boundary:
|
||||
FLOAT {
|
||||
$$.ext = '\0';
|
||||
$$.sigd = significant_digits($1);
|
||||
$$.val = seg_atof($1);
|
||||
}
|
||||
|
|
||||
EXTENSION FLOAT {
|
||||
$$.ext = $1[0];
|
||||
$$.sigd = significant_digits($2);
|
||||
$$.val = seg_atof($2);
|
||||
}
|
||||
;
|
||||
|
||||
deviation:
|
||||
FLOAT {
|
||||
$$.ext = '\0';
|
||||
$$.sigd = significant_digits($1);
|
||||
$$.val = seg_atof($1);
|
||||
}
|
||||
;
|
||||
|
||||
%%
|
||||
|
||||
|
||||
float seg_atof ( char *value ) {
|
||||
float result;
|
||||
char *buf = (char *) palloc(256);
|
||||
|
||||
errno = 0;
|
||||
sscanf(value, "%f", &result);
|
||||
|
||||
if ( errno ) {
|
||||
sprintf(buf, "numeric value %s unrepresentable", value);
|
||||
reset_parse_buffer();
|
||||
elog(ERROR, buf);
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
int seg_yyerror ( char *msg ) {
|
||||
char *buf = (char *) palloc(256);
|
||||
int position;
|
||||
|
||||
yyclearin;
|
||||
|
||||
if ( !strcmp(msg, "parse error, expecting `$'") ) {
|
||||
msg = "expecting end of input";
|
||||
}
|
||||
|
||||
position = parse_buffer_pos() > parse_buffer_size() ? parse_buffer_pos() - 1 : parse_buffer_pos();
|
||||
|
||||
sprintf(
|
||||
buf,
|
||||
"%s at or near position %d, character ('%c', \\%03o), input: '%s'\n",
|
||||
msg,
|
||||
position,
|
||||
parse_buffer()[position - 1],
|
||||
parse_buffer()[position - 1],
|
||||
parse_buffer()
|
||||
);
|
||||
|
||||
reset_parse_buffer();
|
||||
elog(ERROR, buf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,53 @@
|
|||
%{
|
||||
/*
|
||||
** A scanner for EMP-style numeric ranges
|
||||
*/
|
||||
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
#include "segparse.h"
|
||||
#include "buffer.h"
|
||||
|
||||
#define YY_NO_UNPUT 1
|
||||
#undef yywrap
|
||||
|
||||
/* flex screws a couple symbols when used with the -P otion; fix those */
|
||||
#define YY_DECL int seg_yylex YY_PROTO(( void )); \
|
||||
int seg_yylex YY_PROTO(( void ))
|
||||
#define yylval seg_yylval
|
||||
|
||||
/* redefined YY_INPUT reads byte-wise from the memory area defined in buffer.c */
|
||||
#undef YY_INPUT
|
||||
#define YY_INPUT(buf,result,max_size) \
|
||||
{ \
|
||||
int c = read_parse_buffer(); \
|
||||
result = (c == '\0') ? YY_NULL : (buf[0] = c, 1); \
|
||||
}
|
||||
|
||||
void seg_flush_scanner_buffer(void);
|
||||
%}
|
||||
|
||||
range (\.\.)(\.)?
|
||||
plumin (\'\+\-\')|(\(\+\-)\)
|
||||
integer [+-]?[0-9]+
|
||||
real [+-]?[0-9]+\.[0-9]+
|
||||
float ({integer}|{real})([eE]{integer})?
|
||||
|
||||
%%
|
||||
|
||||
{range} yylval.text = yytext; return RANGE;
|
||||
{plumin} yylval.text = yytext; return PLUMIN;
|
||||
{float} yylval.text = yytext; return FLOAT;
|
||||
\< yylval.text = "<"; return EXTENSION;
|
||||
\> yylval.text = ">"; return EXTENSION;
|
||||
\~ yylval.text = "~"; return EXTENSION;
|
||||
[ ]+ /* discard spaces */
|
||||
. return yytext[0]; /* alert parser of the garbage */
|
||||
|
||||
%%
|
||||
|
||||
int seg_yylex();
|
||||
|
||||
void seg_flush_scanner_buffer(void) {
|
||||
YY_FLUSH_BUFFER;
|
||||
}
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
#!/usr/bin/perl
|
||||
|
||||
# this script will sort any table with the segment data type in its last column
|
||||
|
||||
while (<>) {
|
||||
chomp;
|
||||
push @rows, $_;
|
||||
}
|
||||
|
||||
foreach ( sort {
|
||||
@ar = split("\t", $a);
|
||||
$valA = pop @ar;
|
||||
$valA =~ s/[~<> ]+//g;
|
||||
@ar = split("\t", $b);
|
||||
$valB = pop @ar;
|
||||
$valB =~ s/[~<> ]+//g;
|
||||
$valA <=> $valB
|
||||
} @rows ) {
|
||||
print "$_\n";;
|
||||
}
|
||||
|
|
@ -0,0 +1,223 @@
|
|||
--
|
||||
-- Test seg datatype
|
||||
--
|
||||
|
||||
--
|
||||
-- first, define the datatype. Turn off echoing so that expected file
|
||||
-- does not depend on contents of seg.sql.
|
||||
--
|
||||
\set ECHO none
|
||||
\i seg.sql
|
||||
\set ECHO all
|
||||
|
||||
--
|
||||
-- testing the input and output functions
|
||||
--
|
||||
|
||||
-- Any number
|
||||
SELECT '1'::seg AS seg;
|
||||
SELECT '-1'::seg AS seg;
|
||||
SELECT '1.0'::seg AS seg;
|
||||
SELECT '-1.0'::seg AS seg;
|
||||
SELECT '1e7'::seg AS seg;
|
||||
SELECT '-1e7'::seg AS seg;
|
||||
SELECT '1.0e7'::seg AS seg;
|
||||
SELECT '-1.0e7'::seg AS seg;
|
||||
SELECT '1e+7'::seg AS seg;
|
||||
SELECT '-1e+7'::seg AS seg;
|
||||
SELECT '1.0e+7'::seg AS seg;
|
||||
SELECT '-1.0e+7'::seg AS seg;
|
||||
SELECT '1e-7'::seg AS seg;
|
||||
SELECT '-1e-7'::seg AS seg;
|
||||
SELECT '1.0e-7'::seg AS seg;
|
||||
SELECT '-1.0e-7'::seg AS seg;
|
||||
SELECT '2e-6'::seg AS seg;
|
||||
SELECT '2e-5'::seg AS seg;
|
||||
SELECT '2e-4'::seg AS seg;
|
||||
SELECT '2e-3'::seg AS seg;
|
||||
SELECT '2e-2'::seg AS seg;
|
||||
SELECT '2e-1'::seg AS seg;
|
||||
SELECT '2e-0'::seg AS seg;
|
||||
SELECT '2e+0'::seg AS seg;
|
||||
SELECT '2e+1'::seg AS seg;
|
||||
SELECT '2e+2'::seg AS seg;
|
||||
SELECT '2e+3'::seg AS seg;
|
||||
SELECT '2e+4'::seg AS seg;
|
||||
SELECT '2e+5'::seg AS seg;
|
||||
SELECT '2e+6'::seg AS seg;
|
||||
|
||||
|
||||
-- Significant digits preserved
|
||||
SELECT '1'::seg AS seg;
|
||||
SELECT '1.0'::seg AS seg;
|
||||
SELECT '1.00'::seg AS seg;
|
||||
SELECT '1.000'::seg AS seg;
|
||||
SELECT '1.0000'::seg AS seg;
|
||||
SELECT '1.00000'::seg AS seg;
|
||||
SELECT '1.000000'::seg AS seg;
|
||||
SELECT '0.000000120'::seg AS seg;
|
||||
SELECT '3.400e5'::seg AS seg;
|
||||
|
||||
-- Digits truncated
|
||||
SELECT '12.34567890123456'::seg AS seg;
|
||||
|
||||
-- Numbers with certainty indicators
|
||||
SELECT '~6.5'::seg AS seg;
|
||||
SELECT '<6.5'::seg AS seg;
|
||||
SELECT '>6.5'::seg AS seg;
|
||||
SELECT '~ 6.5'::seg AS seg;
|
||||
SELECT '< 6.5'::seg AS seg;
|
||||
SELECT '> 6.5'::seg AS seg;
|
||||
|
||||
-- Open intervals
|
||||
SELECT '0..'::seg AS seg;
|
||||
SELECT '0...'::seg AS seg;
|
||||
SELECT '0 ..'::seg AS seg;
|
||||
SELECT '0 ...'::seg AS seg;
|
||||
SELECT '..0'::seg AS seg;
|
||||
SELECT '...0'::seg AS seg;
|
||||
SELECT '.. 0'::seg AS seg;
|
||||
SELECT '... 0'::seg AS seg;
|
||||
|
||||
-- Finite intervals
|
||||
SELECT '0 .. 1'::seg AS seg;
|
||||
SELECT '-1 .. 0'::seg AS seg;
|
||||
SELECT '-1 .. 1'::seg AS seg;
|
||||
|
||||
-- (+/-) intervals
|
||||
SELECT '0(+-)1'::seg AS seg;
|
||||
SELECT '0(+-)1.0'::seg AS seg;
|
||||
SELECT '1.0(+-)0.005'::seg AS seg;
|
||||
SELECT '101(+-)1'::seg AS seg;
|
||||
-- incorrect number of significant digits in 99.0:
|
||||
SELECT '100(+-)1'::seg AS seg;
|
||||
|
||||
-- invalid input
|
||||
SELECT ''::seg AS seg;
|
||||
SELECT 'ABC'::seg AS seg;
|
||||
SELECT '1ABC'::seg AS seg;
|
||||
SELECT '1.'::seg AS seg;
|
||||
SELECT '1.....'::seg AS seg;
|
||||
SELECT '.1'::seg AS seg;
|
||||
SELECT '1..2.'::seg AS seg;
|
||||
SELECT '1 e7'::seg AS seg;
|
||||
SELECT '1e700'::seg AS seg;
|
||||
|
||||
--
|
||||
-- testing the operators
|
||||
--
|
||||
|
||||
-- equality/inequality:
|
||||
--
|
||||
SELECT '24 .. 33.20'::seg = '24 .. 33.20'::seg AS bool;
|
||||
SELECT '24 .. 33.20'::seg = '24 .. 33.21'::seg AS bool;
|
||||
SELECT '24 .. 33.20'::seg != '24 .. 33.20'::seg AS bool;
|
||||
SELECT '24 .. 33.20'::seg != '24 .. 33.21'::seg AS bool;
|
||||
|
||||
-- overlap
|
||||
--
|
||||
SELECT '1'::seg && '1'::seg AS bool;
|
||||
SELECT '1'::seg && '2'::seg AS bool;
|
||||
SELECT '0 ..'::seg && '0 ..'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg && '0 .. 1'::seg AS bool;
|
||||
SELECT '..0'::seg && '0..'::seg AS bool;
|
||||
SELECT '-1 .. 0.1'::seg && '0 .. 1'::seg AS bool;
|
||||
SELECT '-1 .. 0'::seg && '0 .. 1'::seg AS bool;
|
||||
SELECT '-1 .. -0.0001'::seg && '0 .. 1'::seg AS bool;
|
||||
SELECT '0 ..'::seg && '1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg && '1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg && '2'::seg AS bool;
|
||||
SELECT '0 .. 2'::seg && '1'::seg AS bool;
|
||||
SELECT '1'::seg && '0 .. 1'::seg AS bool;
|
||||
SELECT '2'::seg && '0 .. 1'::seg AS bool;
|
||||
SELECT '1'::seg && '0 .. 2'::seg AS bool;
|
||||
|
||||
-- overlap on the left
|
||||
--
|
||||
SELECT '1'::seg &< '0'::seg AS bool;
|
||||
SELECT '1'::seg &< '1'::seg AS bool;
|
||||
SELECT '1'::seg &< '2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '0'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '0 .. 0.5'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '0 .. 2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '1 .. 2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &< '2 .. 3'::seg AS bool;
|
||||
|
||||
-- overlap on the right
|
||||
--
|
||||
SELECT '0'::seg &> '1'::seg AS bool;
|
||||
SELECT '1'::seg &> '1'::seg AS bool;
|
||||
SELECT '2'::seg &> '1'::seg AS bool;
|
||||
SELECT '0'::seg &> '0 .. 1'::seg AS bool;
|
||||
SELECT '1'::seg &> '0 .. 1'::seg AS bool;
|
||||
SELECT '2'::seg &> '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 0.5'::seg &> '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg &> '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 2'::seg &> '0 .. 2'::seg AS bool;
|
||||
SELECT '1 .. 2'::seg &> '0 .. 1'::seg AS bool;
|
||||
SELECT '2 .. 3'::seg &> '0 .. 1'::seg AS bool;
|
||||
|
||||
-- left
|
||||
--
|
||||
SELECT '1'::seg << '0'::seg AS bool;
|
||||
SELECT '1'::seg << '1'::seg AS bool;
|
||||
SELECT '1'::seg << '2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '0'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '0 .. 0.5'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '0 .. 2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '1 .. 2'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg << '2 .. 3'::seg AS bool;
|
||||
|
||||
-- right
|
||||
--
|
||||
SELECT '0'::seg >> '1'::seg AS bool;
|
||||
SELECT '1'::seg >> '1'::seg AS bool;
|
||||
SELECT '2'::seg >> '1'::seg AS bool;
|
||||
SELECT '0'::seg >> '0 .. 1'::seg AS bool;
|
||||
SELECT '1'::seg >> '0 .. 1'::seg AS bool;
|
||||
SELECT '2'::seg >> '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 0.5'::seg >> '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 1'::seg >> '0 .. 1'::seg AS bool;
|
||||
SELECT '0 .. 2'::seg >> '0 .. 2'::seg AS bool;
|
||||
SELECT '1 .. 2'::seg >> '0 .. 1'::seg AS bool;
|
||||
SELECT '2 .. 3'::seg >> '0 .. 1'::seg AS bool;
|
||||
|
||||
|
||||
-- "contained in" (the left value belongs within the interval specified in the right value):
|
||||
--
|
||||
SELECT '0'::seg ~ '0'::seg AS bool;
|
||||
SELECT '0'::seg ~ '0 ..'::seg AS bool;
|
||||
SELECT '0'::seg ~ '.. 0'::seg AS bool;
|
||||
SELECT '0'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
SELECT '0'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
SELECT '-1'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
SELECT '1'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
SELECT '-1 .. 1'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
|
||||
-- "contains" (the left value contains the interval specified in the right value):
|
||||
--
|
||||
SELECT '0'::seg @ '0'::seg AS bool;
|
||||
SELECT '0 .. '::seg ~ '0'::seg AS bool;
|
||||
SELECT '.. 0'::seg ~ '0'::seg AS bool;
|
||||
SELECT '-1 .. 1'::seg ~ '0'::seg AS bool;
|
||||
SELECT '0'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
SELECT '-1'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
SELECT '1'::seg ~ '-1 .. 1'::seg AS bool;
|
||||
|
||||
-- Load some example data and build the index
|
||||
--
|
||||
CREATE TABLE test_seg (s seg);
|
||||
|
||||
\copy test_seg from 'data/test_seg.data'
|
||||
|
||||
CREATE INDEX test_seg_ix ON test_seg USING gist (s);
|
||||
SELECT count(*) FROM test_seg WHERE s @ '11..11.3';
|
||||
|
||||
-- Test sorting
|
||||
SELECT * FROM test_seg WHERE s @ '11..11.3' GROUP BY s;
|
||||
Loading…
Reference in New Issue