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# 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 {
load_static_extension db wholenumber
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=?)}}
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=?)}}
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=?)}}
# 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=?)}}
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=?)}}
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=?)}}
# 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=?)}}
# 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=?)}}
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=?)}}
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=?)}}
ifcapable stat4||stat3 {
# If ENABLE_STAT4 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=?)}}
} else {
# If ENABLE_STAT4 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=?)}}
}
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=?)}}
ifcapable {!stat4 && !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=?)}}
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=?)}}
}
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=?)}}
finish_test
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