postgres

History

Tom Lane 46e3a16b05 When FOR UPDATE/SHARE is used with LIMIT, put the LockRows plan node

underneath the Limit node, not atop it.  This fixes the old problem that such
a query might unexpectedly return fewer rows than the LIMIT says, due to
LockRows discarding updated rows.

There is a related problem that LockRows might destroy the sort ordering
produced by earlier steps; but fixing that by pushing LockRows below Sort
would create serious performance problems that are unjustified in many
real-world applications, as well as potential deadlock problems from locking
many more rows than expected.  Instead, keep the present semantics of applying
FOR UPDATE after ORDER BY within a single query level; but allow the user to
specify the other way by writing FOR UPDATE in a sub-select.  To make that
work, track whether FOR UPDATE appeared explicitly in sub-selects or got
pushed down from the parent, and don't flatten a sub-select that contained an
explicit FOR UPDATE.

2009-10-28 14:55:47 +00:00

.cvsignore

Remove all traces that suggest that a non-Bison yacc might be supported, and

2008-08-29 13:02:33 +00:00

analyze.c

When FOR UPDATE/SHARE is used with LIMIT, put the LockRows plan node

2009-10-28 14:55:47 +00:00

gram.y

Support SQL-compliant triggers on columns, ie fire only if certain columns

2009-10-14 22:14:25 +00:00

keywords.c

Tweak the core scanner so that it can be used by plpgsql too.

2009-07-14 20:24:10 +00:00

kwlookup.c

Tweak the core scanner so that it can be used by plpgsql too.

2009-07-14 20:24:10 +00:00

Makefile

Derived files that are shipped in the distribution used to be built in the

2009-08-28 20:26:19 +00:00

parse_agg.c

8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list

2009-06-11 14:49:15 +00:00

parse_clause.c

Make FOR UPDATE/SHARE in the primary query not propagate into WITH queries;

2009-10-27 17:11:18 +00:00

parse_coerce.c

8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list

2009-06-11 14:49:15 +00:00

parse_cte.c

Make FOR UPDATE/SHARE in the primary query not propagate into WITH queries;

2009-10-27 17:11:18 +00:00

parse_expr.c

Make FOR UPDATE/SHARE in the primary query not propagate into WITH queries;

2009-10-27 17:11:18 +00:00

parse_func.c

Support use of function argument names to identify which actual arguments

2009-10-08 02:39:25 +00:00

parse_node.c

8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list

2009-06-11 14:49:15 +00:00

parse_oper.c

Fix get_sort_group_operators() so that it doesn't think arrays can be grouped

2009-06-13 15:42:09 +00:00

parse_relation.c

Make FOR UPDATE/SHARE in the primary query not propagate into WITH queries;

2009-10-27 17:11:18 +00:00

parse_target.c

Remove add_missing_from GUC and associated parser support for "implicit RTEs".

2009-10-21 20:22:38 +00:00

parse_type.c

Make backend header files C++ safe

2009-07-16 06:33:46 +00:00

parse_utilcmd.c

Code review for LIKE INCLUDING patch --- clean up some cosmetic and not

2009-10-13 00:53:08 +00:00

parser.c

Tweak the core scanner so that it can be used by plpgsql too.

2009-07-14 20:24:10 +00:00

README

Small wording improvements for source code READMEs.

2008-04-09 01:00:46 +00:00

scan.l

Sync psql's scanner with recent changes in backend scanner's flex rules.

2009-09-27 03:27:24 +00:00

scansup.c

2009-01-01 17:24:05 +00:00

README

$PostgreSQL: pgsql/src/backend/parser/README,v 1.10 2008/04/09 01:00:46 momjian Exp $

Parser
======

This directory does more than tokenize and parse SQL queries.  It also
creates Query structures for the various complex queries that are passed
to the optimizer and then executor.

parser.c	things start here
scan.l		break query into tokens
scansup.c	handle escapes in input strings
keywords.c	turn keywords into specific tokens
gram.y		parse the tokens and fill query-type-specific structures
analyze.c	top level of parse analysis for optimizable queries
parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
parse_coerce.c	handle coercing expressions to different data types
parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
parse_oper.c	handle operators in expressions
parse_agg.c	handle aggregates, like SUM(col1),  AVG(col2), ...
parse_func.c	handle functions, table.column and column identifiers
parse_node.c	create nodes for various structures
parse_target.c	handle the result list of the query
parse_relation.c support routines for tables and column handling
parse_type.c	support routines for data type handling
parse_utilcmd.c	parse analysis for utility commands (done at execution time)