# 2011 August 13 # # 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 tests for SQLite library. The focus of the tests # in this file is testing the capabilities of sqlite_stat3. # set testdir [file dirname $argv0] source $testdir/tester.tcl ifcapable !stat3 { finish_test return } set testprefix analyze8 proc eqp {sql {db db}} { uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db } # Scenario: # # Two indices. One has mostly singleton entries, but for a few # values there are hundreds of entries. The other has 10-20 # entries per value. # # Verify that the query planner chooses the first index for the singleton # entries and the second index for the others. # do_test 1.0 { db eval { CREATE TABLE t1(a,b,c,d); CREATE INDEX t1a ON t1(a); CREATE INDEX t1b ON t1(b); CREATE INDEX t1c ON t1(c); } for {set i 0} {$i<1000} {incr i} { if {$i%2==0} {set a $i} {set a [expr {($i%8)*100}]} set b [expr {$i/10}] set c [expr {$i/8}] set c [expr {$c*$c*$c}] db eval {INSERT INTO t1 VALUES($a,$b,$c,$i)} } db eval {ANALYZE} } {} # The a==100 comparison is expensive because there are many rows # with a==100. And so for those cases, choose the t1b index. # # Buf ro a==99 and a==101, there are far fewer rows so choose # the t1a index. # do_test 1.1 { eqp {SELECT * FROM t1 WHERE a=100 AND b=55} } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?)}} do_test 1.2 { eqp {SELECT * FROM t1 WHERE a=99 AND b=55} } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?)}} do_test 1.3 { eqp {SELECT * FROM t1 WHERE a=101 AND b=55} } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?)}} do_test 1.4 { eqp {SELECT * FROM t1 WHERE a=100 AND b=56} } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?)}} do_test 1.5 { eqp {SELECT * FROM t1 WHERE a=99 AND b=56} } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?)}} do_test 1.6 { eqp {SELECT * FROM t1 WHERE a=101 AND b=56} } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?)}} do_test 2.1 { eqp {SELECT * FROM t1 WHERE a=100 AND b BETWEEN 50 AND 54} } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b>? AND b? AND b? AND c? AND c