Import SQLite 3.7.6.3.

third_party/sqlite/src/test/where6.test

 # 2007 June 8
 #
 # 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 109 matching lines @@
   execsql {
     SELECT * FROM t1 LEFT JOIN t2 ON x=b WHERE 1=c;
   }
 } {1 3 1 3}
 do_test where6-2.14 {
   execsql {
     SELECT * FROM t1 LEFT JOIN t2 ON b=x WHERE 1=c;
   }
 } {1 3 1 3}
 
+# Ticket [ebdbadade5b]:
+# If the ON close on a LEFT JOIN is of the form x=y where both x and y
+# are indexed columns on tables to left of the join, then do not use that 
+# term with indices to either table.
+#
+do_test where6-3.1 {
+  db eval {
+    CREATE TABLE t4(x UNIQUE);
+    INSERT INTO t4 VALUES('abc');
+    INSERT INTO t4 VALUES('def');
+    INSERT INTO t4 VALUES('ghi');
+    CREATE TABLE t5(a, b, c, PRIMARY KEY(a,b));
+    INSERT INTO t5 VALUES('abc','def',123);
+    INSERT INTO t5 VALUES('def','ghi',456);
+
+    SELECT t4a.x, t4b.x, t5.c, t6.v
+      FROM t4 AS t4a
+           INNER JOIN t4 AS t4b
+           LEFT JOIN t5 ON t5.a=t4a.x AND t5.b=t4b.x
+           LEFT JOIN (SELECT 1 AS v) AS t6 ON t4a.x=t4b.x
+     ORDER BY 1, 2, 3;
+  }
+} {abc abc {} 1 abc def 123 {} abc ghi {} {} def abc {} {} def def {} 1 def ghi 456 {} ghi abc {} {} ghi def {} {} ghi ghi {} 1}
+
 finish_test