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-rw-r--r-- | test/analyzeD.test | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/test/analyzeD.test b/test/analyzeD.test new file mode 100644 index 0000000..7a51785 --- /dev/null +++ b/test/analyzeD.test @@ -0,0 +1,107 @@ +# 2014-10-04 +# +# 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. +# + +set testdir [file dirname $argv0] +source $testdir/tester.tcl +set ::testprefix analyzeD + +ifcapable {!stat4} { + finish_test + return +} + + +# Set up a table with the following properties: +# +# * Contains 1000 rows. +# * Column a contains even integers between 0 and 18, inclusive (so that +# a=? for any such integer matches 100 rows). +# * Column b contains integers between 0 and 9, inclusive. +# * Column c contains integers between 0 and 199, inclusive (so that +# for any such integer, c=? matches 5 rows). +# * Then add 7 rows with a new value for "a" - 3001. The stat4 table will +# not contain any samples with a=3001. +# +do_execsql_test 1.0 { + CREATE TABLE t1(a, b, c); +} +do_test 1.1 { + for {set i 1} {$i < 1000} {incr i} { + set c [expr $i % 200] + execsql { INSERT INTO t1(a, b, c) VALUES( 2*($i/100), $i%10, $c ) } + } + + execsql { + INSERT INTO t1 VALUES(3001, 3001, 3001); + INSERT INTO t1 VALUES(3001, 3001, 3002); + INSERT INTO t1 VALUES(3001, 3001, 3003); + INSERT INTO t1 VALUES(3001, 3001, 3004); + INSERT INTO t1 VALUES(3001, 3001, 3005); + INSERT INTO t1 VALUES(3001, 3001, 3006); + INSERT INTO t1 VALUES(3001, 3001, 3007); + + CREATE INDEX t1_ab ON t1(a, b); + CREATE INDEX t1_c ON t1(c); + + ANALYZE; + } +} {} + +# With full ANALYZE data, SQLite sees that c=150 (5 rows) is better than +# a=3001 (7 rows). +# +do_eqp_test 1.2 { + SELECT * FROM t1 WHERE a=3001 AND c=150; +} {SEARCH t1 USING INDEX t1_c (c=?)} + +do_test 1.3 { + execsql { DELETE FROM sqlite_stat1 } + db close + sqlite3 db test.db +} {} + +# Without stat1, because 3001 is larger than all samples in the stat4 +# table, SQLite thinks that a=3001 matches just 1 row. So it (incorrectly) +# chooses it over the c=150 index (5 rows). Even with stat1 data, things +# worked this way before commit [e6f7f97dbc]. +# +do_eqp_test 1.4 { + SELECT * FROM t1 WHERE a=3001 AND c=150; +} {SEARCH t1 USING INDEX t1_ab (a=?)} + +do_test 1.5 { + execsql { + UPDATE t1 SET a=13 WHERE a = 3001; + ANALYZE; + } +} {} + +do_eqp_test 1.6 { + SELECT * FROM t1 WHERE a=13 AND c=150; +} {SEARCH t1 USING INDEX t1_c (c=?)} + +do_test 1.7 { + execsql { DELETE FROM sqlite_stat1 } + db close + sqlite3 db test.db +} {} + +# Same test as 1.4, except this time the 7 rows that match the a=? condition +# do not feature larger values than all rows in the stat4 table. So SQLite +# gets this right, even without stat1 data. +do_eqp_test 1.8 { + SELECT * FROM t1 WHERE a=13 AND c=150; +} {SEARCH t1 USING INDEX t1_c (c=?)} + +finish_test |