Import SQLite 3.8.7.4.

third_party/sqlite/src/test/select9.test

 # 2008 June 24
 #
 # 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.
 #
 #***********************************************************************
@@ skipping 397 matching lines @@
   cksort { SELECT a FROM v1 ORDER BY 1 LIMIT 5 }
 } {1 2 3 4 5 sort}
 do_test select9-4.X {
   execsql {
     DROP INDEX i1;
     DROP INDEX i2;
     DROP VIEW v1;
   }
 } {}
 
+# Testing to make sure that queries involving a view of a compound select
+# are planned efficiently.  This detects a problem reported on the mailing
+# list on 2012-04-26.  See
+#
+#  http://www.mail-archive.com/sqlite-users%40sqlite.org/msg69746.html
+#
+# For additional information.
+#
+do_test select9-5.1 {
+  db eval {
+    CREATE TABLE t51(x, y);
+    CREATE TABLE t52(x, y);
+    CREATE VIEW v5 as
+       SELECT x, y FROM t51
+       UNION ALL
+       SELECT x, y FROM t52;
+    CREATE INDEX t51x ON t51(x);
+    CREATE INDEX t52x ON t52(x);
+    EXPLAIN QUERY PLAN
+       SELECT * FROM v5 WHERE x='12345' ORDER BY y;
+  }
+} {~/SCAN TABLE/}  ;# Uses indices with "*"
+do_test select9-5.2 {
+  db eval {
+    EXPLAIN QUERY PLAN
+       SELECT x, y FROM v5 WHERE x='12345' ORDER BY y;
+  }
+} {~/SCAN TABLE/}  ;# Uses indices with "x, y"
+do_test select9-5.3 {
+  db eval {
+    EXPLAIN QUERY PLAN
+       SELECT x, y FROM v5 WHERE +x='12345' ORDER BY y;
+  }
+} {/SCAN TABLE/}   ;# Full table scan if the "+x" prevents index usage.
+
+# 2013-07-09:  Ticket [490a4b7235624298]: 
+# "WHERE 0" on the first element of a UNION causes an assertion fault
+#
+do_execsql_test select9-6.1 {
+  CREATE TABLE t61(a);
+  CREATE TABLE t62(b);
+  INSERT INTO t61 VALUES(111);
+  INSERT INTO t62 VALUES(222);
+  SELECT a FROM t61 WHERE 0 UNION SELECT b FROM t62;
+} {222}
+do_execsql_test select9-6.2 {
+  SELECT a FROM t61 WHERE 0 UNION ALL SELECT b FROM t62;
+} {222}
+do_execsql_test select9-6.3 {
+  SELECT a FROM t61 UNION SELECT b FROM t62 WHERE 0;
+} {111}
+
+
 
 finish_test