Allow whereShortCut() to use the PRIMARY KEY index of a WITHOUT ROWID table to optimize a vector of "IS" operators in a WHERE clause.

FossilOrigin-Name: 52e73eeca063bb30092ce600068bf487641399a0
2015-03-18 20:03:27 +00:00
parent 9340de52e2
commit c3b328da6e
6 changed files with 109 additions and 14 deletions
@@ -0,0 +1,63 @@
+# 2015-03-19
+#
+# 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.
+#
+#***********************************************************************
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set ::testprefix whereK
+
+do_execsql_test 1.0 {
+  CREATE TABLE t1(v, w TEXT, x, PRIMARY KEY(w, x)) WITHOUT ROWID;
+
+  INSERT INTO t1 VALUES('a', 1, 1);
+  INSERT INTO t1 VALUES('B', 2, 2);
+  INSERT INTO t1 VALUES('C', 3, 3);
+  INSERT INTO t1 VALUES('d', 4, 4);
+
+  CREATE TABLE t2(v, w TEXT, x, PRIMARY KEY(w, x));
+
+  CREATE TABLE t3(a, b, c);
+  CREATE UNIQUE INDEX t3a ON t3(a);
+}
+
+do_eqp_test 1.1.1 {
+  SELECT v FROM t1 WHERE w IS ? AND x IS ?
+} {/SEARCH TABLE t1.*(w=. AND x=.)/}
+
+do_eqp_test 1.1.2 {
+  SELECT v FROM t2 WHERE w IS ? AND x IS ?
+} {/SCAN TABLE t2/}
+
+do_execsql_test 1.2.1 { SELECT v FROM t1 WHERE w IS 1   AND x IS 1 }   {a}
+do_execsql_test 1.2.2 { SELECT v FROM t1 WHERE w IS '2' AND x IS 2 }   {B}
+do_execsql_test 1.2.3 { SELECT v FROM t1 WHERE w IS 3   AND x IS '3' } {}
+do_execsql_test 1.2.4 { SELECT v FROM t1 WHERE w IS '4' AND x IS '4' } {}
+  
+
+# IS constraints may only be used if all fields of the index are 
+# constrained by either "IS" or "=".
+#
+do_eqp_test 1.3.1 {
+    SELECT v FROM t1 WHERE w IS ?
+} {/SCAN TABLE t1/}
+do_eqp_test 1.3.2 {
+    SELECT v FROM t1 WHERE w IS ? AND x > ?
+} {/SCAN TABLE t1/}
+
+do_execsql_test 1.4.1 { SELECT v FROM t1 WHERE w IS 3   AND x = 3 } {C}
+do_execsql_test 1.4.2 { SELECT v FROM t1 WHERE w = '4' AND x IS 4 } {d}
+
+do_eqp_test 1.5.1 { SELECT b FROM t3 WHERE a IS ? } {/SCAN TABLE/}
+do_eqp_test 1.5.2 { SELECT b FROM t3 WHERE a = ? } {/SEARCH TABLE/}
+
+finish_test
+
+