1# 2017 April 30 2# 3# The author disclaims copyright to this source code. In place of 4# a legal notice, here is a blessing: 5# 6# May you do good and not evil. 7# May you find forgiveness for yourself and forgive others. 8# May you share freely, never taking more than you give. 9# 10#*********************************************************************** 11# 12# Test the HAVING->WHERE optimization. 13# 14 15set testdir [file dirname $argv0] 16source $testdir/tester.tcl 17set testprefix having 18 19do_execsql_test 1.0 { 20 CREATE TABLE t2(c, d); 21 22 CREATE TABLE t1(a, b); 23 INSERT INTO t1 VALUES(1, 1); 24 INSERT INTO t1 VALUES(2, 2); 25 INSERT INTO t1 VALUES(1, 3); 26 INSERT INTO t1 VALUES(2, 4); 27 INSERT INTO t1 VALUES(1, 5); 28 INSERT INTO t1 VALUES(2, 6); 29} {} 30 31foreach {tn sql res} { 32 1 "SELECT a, sum(b) FROM t1 GROUP BY a HAVING a=2" {2 12} 33 2 "SELECT a, sum(b) FROM t1 GROUP BY a HAVING a=2 AND sum(b)>10" {2 12} 34 3 "SELECT a, sum(b) FROM t1 GROUP BY a HAVING sum(b)>12" {} 35} { 36 do_execsql_test 1.$tn $sql $res 37} 38 39# Run an EXPLAIN command for both SQL statements. Return true if 40# the outputs are identical, or false otherwise. 41# 42proc compare_vdbe {sql1 sql2} { 43 set r1 [list] 44 set r2 [list] 45 db eval "explain $sql1" { lappend r1 $opcode $p1 $p2 $p3 $p4 $p5} 46 db eval "explain $sql2" { lappend r2 $opcode $p1 $p2 $p3 $p4 $p5} 47 return [expr {$r1==$r2}] 48} 49 50proc do_compare_vdbe_test {tn sql1 sql2 res} { 51 uplevel [list do_test $tn [list compare_vdbe $sql1 $sql2] $res] 52} 53 54#------------------------------------------------------------------------- 55# Test that various statements that are eligible for the optimization 56# produce the same VDBE code as optimizing by hand does. 57# 58foreach {tn sql1 sql2} { 59 1 "SELECT a, sum(b) FROM t1 GROUP BY a HAVING a=2" 60 "SELECT a, sum(b) FROM t1 WHERE a=2 GROUP BY a" 61 62 2 "SELECT a, sum(b) FROM t1 GROUP BY a HAVING sum(b)>5 AND a=2" 63 "SELECT a, sum(b) FROM t1 WHERE a=2 GROUP BY a HAVING sum(b)>5" 64 65 3 "SELECT a, sum(b) FROM t1 GROUP BY a COLLATE binary HAVING a=2" 66 "SELECT a, sum(b) FROM t1 WHERE a=2 GROUP BY a COLLATE binary" 67 68 4 { 69 SELECT x,y FROM ( 70 SELECT a AS x, sum(b) AS y FROM t1 71 GROUP BY a 72 ) WHERE x BETWEEN 8888 AND 9999 73 } { 74 SELECT x,y FROM ( 75 SELECT a AS x, sum(b) AS y FROM t1 76 WHERE x BETWEEN 8888 AND 9999 77 GROUP BY a 78 ) 79 } 80 81 5 "SELECT a, sum(b) FROM t1 GROUP BY a COLLATE binary HAVING 0" 82 "SELECT a, sum(b) FROM t1 WHERE 0 GROUP BY a COLLATE binary" 83 84 6 "SELECT count(*) FROM t1,t2 WHERE a=c GROUP BY b, d HAVING b=d" 85 "SELECT count(*) FROM t1,t2 WHERE a=c AND b=d GROUP BY b, d" 86 87 7 { 88 SELECT count(*) FROM t1,t2 WHERE a=c GROUP BY b, d 89 HAVING b=d COLLATE nocase 90 } { 91 SELECT count(*) FROM t1,t2 WHERE a=c AND b=d COLLATE nocase 92 GROUP BY b, d 93 } 94 95 8 "SELECT a, sum(b) FROM t1 GROUP BY a||b HAVING substr(a||b, 1, 1)='a'" 96 "SELECT a, sum(b) FROM t1 WHERE substr(a||b, 1, 1)='a' GROUP BY a||b" 97} { 98 do_compare_vdbe_test 2.$tn $sql1 $sql2 1 99} 100 101#------------------------------------------------------------------------- 102# 1: Test that the optimization is only applied if the GROUP BY term 103# uses BINARY collation. 104# 105# 2: Not applied if there is a non-deterministic function in the HAVING 106# term. 107# 108foreach {tn sql1 sql2} { 109 1 "SELECT a, sum(b) FROM t1 GROUP BY a COLLATE nocase HAVING a=2" 110 "SELECT a, sum(b) FROM t1 WHERE a=2 GROUP BY a COLLATE nocase" 111 112 2 "SELECT a, sum(b) FROM t1 GROUP BY a HAVING randomblob(a)<X'88'" 113 "SELECT a, sum(b) FROM t1 WHERE randomblob(a)<X'88' GROUP BY a" 114} { 115 do_compare_vdbe_test 3.$tn $sql1 $sql2 0 116} 117 118 119#------------------------------------------------------------------------- 120# Test that non-deterministic functions disqualify a term from being 121# moved from the HAVING to WHERE clause. 122# 123do_execsql_test 4.1 { 124 CREATE TABLE t3(a, b); 125 INSERT INTO t3 VALUES(1, 1); 126 INSERT INTO t3 VALUES(1, 2); 127 INSERT INTO t3 VALUES(1, 3); 128 INSERT INTO t3 VALUES(2, 1); 129 INSERT INTO t3 VALUES(2, 2); 130 INSERT INTO t3 VALUES(2, 3); 131} 132 133proc nondeter {args} { 134 incr ::nondeter_ret 135 expr {$::nondeter_ret % 2} 136} 137db func nondeter nondeter 138 139set ::nondeter_ret 0 140do_execsql_test 4.2 { 141 SELECT a, sum(b) FROM t3 GROUP BY a HAVING nondeter(a) 142} {1 6} 143 144# If the term where moved, the query above would return the same 145# result as the following. But it does not. 146# 147set ::nondeter_ret 0 148do_execsql_test 4.3 { 149 SELECT a, sum(b) FROM t3 WHERE nondeter(a) GROUP BY a 150} {1 4 2 2} 151 152 153finish_test 154