4e50c5ec48
field to index statistics. Fixed several problems in the query planner associated with stat3. FossilOrigin-Name: 89b2f70884cad0abdf4c66cb64ecddb2820ded74
114 lines
4.1 KiB
Plaintext
114 lines
4.1 KiB
Plaintext
# 2011 April 1
|
|
#
|
|
# The author disclaims copyright to this source code. In place of
|
|
# a legal notice, here is a blessing:
|
|
#
|
|
# May you do good and not evil.
|
|
# May you find forgiveness for yourself and forgive others.
|
|
# May you share freely, never taking more than you give.
|
|
#
|
|
#***********************************************************************
|
|
# This file implements regression tests for SQLite library.
|
|
# This file implements tests for the ANALYZE command when an idnex
|
|
# name is given as the argument.
|
|
#
|
|
|
|
set testdir [file dirname $argv0]
|
|
source $testdir/tester.tcl
|
|
|
|
# There is nothing to test if ANALYZE is disable for this build.
|
|
#
|
|
ifcapable {!analyze||!vtab} {
|
|
finish_test
|
|
return
|
|
}
|
|
|
|
# Generate some test data
|
|
#
|
|
do_test analyze7-1.0 {
|
|
register_wholenumber_module db
|
|
execsql {
|
|
CREATE TABLE t1(a,b,c,d);
|
|
CREATE INDEX t1a ON t1(a);
|
|
CREATE INDEX t1b ON t1(b);
|
|
CREATE INDEX t1cd ON t1(c,d);
|
|
CREATE VIRTUAL TABLE nums USING wholenumber;
|
|
INSERT INTO t1 SELECT value, value, value/100, value FROM nums
|
|
WHERE value BETWEEN 1 AND 256;
|
|
EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123;
|
|
}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~10 rows)}}
|
|
do_test analyze7-1.1 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=123;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~10 rows)}}
|
|
do_test analyze7-1.2 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~10 rows)}}
|
|
|
|
# Run an analyze on one of the three indices. Verify that this
|
|
# effects the row-count estimate on the one query that uses that
|
|
# one index.
|
|
#
|
|
do_test analyze7-2.0 {
|
|
execsql {ANALYZE t1a;}
|
|
db cache flush
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
|
|
do_test analyze7-2.1 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=123;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~10 rows)}}
|
|
do_test analyze7-2.2 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~10 rows)}}
|
|
|
|
# Verify that since the query planner now things that t1a is more
|
|
# selective than t1b, it prefers to use t1a.
|
|
#
|
|
do_test analyze7-2.3 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND b=123}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
|
|
|
|
# Run an analysis on another of the three indices. Verify that this
|
|
# new analysis works and does not disrupt the previous analysis.
|
|
#
|
|
do_test analyze7-3.0 {
|
|
execsql {ANALYZE t1cd;}
|
|
db cache flush;
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
|
|
do_test analyze7-3.1 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=123;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~10 rows)}}
|
|
do_test analyze7-3.2.1 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=?;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~86 rows)}}
|
|
ifcapable stat3 {
|
|
# If ENABLE_STAT3 is defined, SQLite comes up with a different estimated
|
|
# row count for (c=2) than it does for (c=?).
|
|
do_test analyze7-3.2.2 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~57 rows)}}
|
|
} else {
|
|
# If ENABLE_STAT3 is not defined, the expected row count for (c=2) is the
|
|
# same as that for (c=?).
|
|
do_test analyze7-3.2.3 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~86 rows)}}
|
|
}
|
|
do_test analyze7-3.3 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND b=123}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
|
|
ifcapable {!stat3} {
|
|
do_test analyze7-3.4 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=123 AND b=123}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~2 rows)}}
|
|
do_test analyze7-3.5 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND c=123}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
|
|
}
|
|
do_test analyze7-3.6 {
|
|
execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=123 AND d=123 AND b=123}
|
|
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=? AND d=?) (~1 rows)}}
|
|
|
|
finish_test
|