59 lines
1.9 KiB
Plaintext
59 lines
1.9 KiB
Plaintext
# 2014-06-17
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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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#
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# This file implements regression tests for SQLite library. The
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# focus of this script is testing automatic index creation logic,
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# and specifically that an automatic index will not be created that
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# shadows a declared index.
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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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# The t1b and t2d indexes are not very selective. It used to be that
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# the autoindex mechanism would create automatic indexes on t1(b) or
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# t2(d), make assumptions that they were reasonably selective, and use
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# them instead of t1b or t2d. But that would be cheating, because the
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# automatic index cannot be any more selective than the real index.
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#
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# This test verifies that the cheat is no longer allowed.
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#
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do_execsql_test autoindex3-100 {
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CREATE TABLE t1(a,b,x);
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CREATE TABLE t2(c,d,y);
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CREATE INDEX t1b ON t1(b);
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CREATE INDEX t2d ON t2(d);
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ANALYZE sqlite_master;
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INSERT INTO sqlite_stat1 VALUES('t1','t1b','10000 500');
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INSERT INTO sqlite_stat1 VALUES('t2','t2d','10000 500');
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d=b;
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} {~/AUTO/}
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# Automatic indexes can still be used if existing indexes do not
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# participate in == constraints.
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#
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do_execsql_test autoindex3-110 {
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EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d>b AND x=y;
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} {/AUTO/}
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do_execsql_test autoindex3-120 {
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EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d<b AND x=y;
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} {/AUTO/}
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do_execsql_test autoindex3-130 {
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EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d IS NULL AND x=y;
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} {/AUTO/}
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do_execsql_test autoindex3-140 {
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EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d IN (5,b) AND x=y;
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} {/AUTO/}
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finish_test
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