112 lines
4.1 KiB
Plaintext
112 lines
4.1 KiB
Plaintext
# 2011 April 1
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library.
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# This file implements tests for the ANALYZE command when an idnex
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# name is given as the argument.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# There is nothing to test if ANALYZE is disable for this build.
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#
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ifcapable {!analyze||!vtab} {
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finish_test
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return
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}
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# Generate some test data
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#
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do_test analyze7-1.0 {
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register_wholenumber_module db
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execsql {
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CREATE TABLE t1(a,b,c,d);
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CREATE INDEX t1a ON t1(a);
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CREATE INDEX t1b ON t1(b);
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CREATE INDEX t1cd ON t1(c,d);
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CREATE VIRTUAL TABLE nums USING wholenumber;
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INSERT INTO t1 SELECT value, value, value/100, value FROM nums
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WHERE value BETWEEN 1 AND 256;
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123;
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}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~10 rows)}}
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do_test analyze7-1.1 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=123;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~10 rows)}}
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do_test analyze7-1.2 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~10 rows)}}
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# Run an analyze on one of the three indices. Verify that this
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# effects the row-count estimate on the one query that uses that
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# one index.
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#
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do_test analyze7-2.0 {
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execsql {ANALYZE t1a;}
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db cache flush
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
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do_test analyze7-2.1 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=123;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~10 rows)}}
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do_test analyze7-2.2 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~10 rows)}}
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# Verify that since the query planner now things that t1a is more
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# selective than t1b, it prefers to use t1a.
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#
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do_test analyze7-2.3 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND b=123}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
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# Run an analysis on another of the three indices. Verify that this
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# new analysis works and does not disrupt the previous analysis.
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#
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do_test analyze7-3.0 {
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execsql {ANALYZE t1cd;}
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db cache flush;
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
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do_test analyze7-3.1 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=123;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~10 rows)}}
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do_test analyze7-3.2.1 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=?;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~86 rows)}}
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ifcapable stat2 {
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# If ENABLE_STAT2 is defined, SQLite comes up with a different estimated
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# row count for (c=2) than it does for (c=?).
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do_test analyze7-3.2.2 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~51 rows)}}
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} else {
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# If ENABLE_STAT2 is not defined, the expected row count for (c=2) is the
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# same as that for (c=?).
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do_test analyze7-3.2.3 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=2;}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=?) (~86 rows)}}
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}
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do_test analyze7-3.3 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND b=123}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
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do_test analyze7-3.4 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=123 AND b=123}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~2 rows)}}
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do_test analyze7-3.5 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=123 AND c=123}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
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do_test analyze7-3.6 {
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execsql {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE c=123 AND d=123 AND b=123}
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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1cd (c=? AND d=?) (~1 rows)}}
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finish_test
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