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+# 2005 November 26
+#
+# 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 regression tests for SQLite library.
+#
+# This file implements tests to verify that ticket #1537 is
+# fixed.  
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test tkt1537-1.1 {
+  execsql {
+    CREATE TABLE t1(id, a1, a2);
+    INSERT INTO t1 VALUES(1, NULL, NULL);
+    INSERT INTO t1 VALUES(2, 1, 3);
+    CREATE TABLE t2(id, b);
+    INSERT INTO t2 VALUES(3, 1);
+    INSERT INTO t2 VALUES(4, NULL);
+    SELECT * FROM t1 LEFT JOIN t2 ON a1=b OR a2=+b;
+  }
+} {1 {} {} {} {} 2 1 3 3 1}
+do_test tkt1537-1.2 {
+  execsql {
+    SELECT * FROM t1 LEFT JOIN t2 ON a1=b OR a2=b;
+  }
+} {1 {} {} {} {} 2 1 3 3 1}
+do_test tkt1537-1.3 {
+  execsql {
+    SELECT * FROM t2 LEFT JOIN t1 ON a1=b OR a2=b;
+  }
+} {3 1 2 1 3 4 {} {} {} {}}
+ifcapable subquery {
+  do_test tkt1537-1.4 {
+    execsql {
+      SELECT * FROM t1 LEFT JOIN t2 ON b IN (a1,a2);
+    }
+  } {1 {} {} {} {} 2 1 3 3 1}
+  do_test tkt1537-1.5 {
+    execsql {
+      SELECT * FROM t2 LEFT JOIN t1 ON b IN (a2,a1);
+    }
+  } {3 1 2 1 3 4 {} {} {} {}}
+}
+do_test tkt1537-1.6 {
+  execsql {
+    CREATE INDEX t1a1 ON t1(a1);
+    CREATE INDEX t1a2 ON t1(a2);
+    CREATE INDEX t2b ON t2(b);
+    SELECT * FROM t1 LEFT JOIN t2 ON a1=b OR a2=b;
+  }
+} {1 {} {} {} {} 2 1 3 3 1}
+do_test tkt1537-1.7 {
+  execsql {
+    SELECT * FROM t2 LEFT JOIN t1 ON a1=b OR a2=b;
+  }
+} {3 1 2 1 3 4 {} {} {} {}}
+
+ifcapable subquery {
+  do_test tkt1537-1.8 {
+    execsql {
+      SELECT * FROM t1 LEFT JOIN t2 ON b IN (a1,a2);
+    }
+  } {1 {} {} {} {} 2 1 3 3 1}
+  do_test tkt1537-1.9 {
+    execsql {
+      SELECT * FROM t2 LEFT JOIN t1 ON b IN (a2,a1);
+    }
+  } {3 1 2 1 3 4 {} {} {} {}}
+}
+
+execsql {
+  DROP INDEX t1a1;
+  DROP INDEX t1a2;
+  DROP INDEX t2b;
+}
+
+do_test tkt1537-2.1 {
+  execsql {
+    SELECT * FROM t1 LEFT JOIN t2 ON b BETWEEN a1 AND a2;
+  }
+} {1 {} {} {} {} 2 1 3 3 1}
+do_test tkt1537-2.2 {
+  execsql {
+    CREATE INDEX t2b ON t2(b);
+    SELECT * FROM t1 LEFT JOIN t2 ON b BETWEEN a1 AND a2;
+  }
+} {1 {} {} {} {} 2 1 3 3 1}
+do_test tkt1537-2.3 {
+  execsql {
+    SELECT * FROM t2 LEFT JOIN t1 ON b BETWEEN a1 AND a2;
+  }
+} {3 1 2 1 3 4 {} {} {} {}}
+do_test tkt1537-2.4 {
+  execsql {
+    CREATE INDEX t1a1 ON t1(a1);
+    CREATE INDEX t1a2 ON t1(a2);
+    SELECT * FROM t2 LEFT JOIN t1 ON b BETWEEN a1 AND a2;
+  }
+} {3 1 2 1 3 4 {} {} {} {}}
+
+do_test tkt1537-3.1 {
+  execsql {
+    SELECT * FROM t1 LEFT JOIN t2 ON b GLOB 'abc*' WHERE t1.id=1;
+  }
+} {1 {} {} {} {}}
+do_test tkt1537-3.2 {
+  execsql { 
+    SELECT * FROM t2 LEFT JOIN t1 ON a1 GLOB 'abc*' WHERE t2.id=3;
+  }
+} {3 1 {} {} {}}
+
+
+finish_test