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Diffstat (limited to 'test/autoindex3.test')
-rw-r--r-- | test/autoindex3.test | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/test/autoindex3.test b/test/autoindex3.test new file mode 100644 index 0000000..33053bb --- /dev/null +++ b/test/autoindex3.test @@ -0,0 +1,58 @@ +# 2014-06-17 +# +# 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. The +# focus of this script is testing automatic index creation logic, +# and specifically that an automatic index will not be created that +# shadows a declared index. +# + +set testdir [file dirname $argv0] +source $testdir/tester.tcl + +# The t1b and t2d indexes are not very selective. It used to be that +# the autoindex mechanism would create automatic indexes on t1(b) or +# t2(d), make assumptions that they were reasonably selective, and use +# them instead of t1b or t2d. But that would be cheating, because the +# automatic index cannot be any more selective than the real index. +# +# This test verifies that the cheat is no longer allowed. +# +do_execsql_test autoindex3-100 { + CREATE TABLE t1(a,b,x); + CREATE TABLE t2(c,d,y); + CREATE INDEX t1b ON t1(b); + CREATE INDEX t2d ON t2(d); + ANALYZE sqlite_master; + INSERT INTO sqlite_stat1 VALUES('t1','t1b','10000 500'); + INSERT INTO sqlite_stat1 VALUES('t2','t2d','10000 500'); + ANALYZE sqlite_master; + EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d=b; +} {~/AUTO/} + +# Automatic indexes can still be used if existing indexes do not +# participate in == constraints. +# +do_execsql_test autoindex3-110 { + EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d>b AND x=y; +} {/AUTO/} +do_execsql_test autoindex3-120 { + EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d<b AND x=y; +} {/AUTO/} +do_execsql_test autoindex3-130 { + EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d IS NULL AND x=y; +} {/AUTO/} +do_execsql_test autoindex3-140 { + EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d IN (5,b) AND x=y; +} {/AUTO/} + + +finish_test |