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+# 2015 November 18
+#
+# 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.
+#
+#***********************************************************************
+#
+# Test the __hidden__ hack.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix hidden
+
+ifcapable !hiddencolumns {
+  finish_test
+  return
+}
+
+do_execsql_test 1.1 {
+  CREATE TABLE t1(__hidden__a, b);
+  INSERT INTO t1 VALUES('1');
+  INSERT INTO t1(__hidden__a, b) VALUES('x', 'y');
+} {}
+
+do_execsql_test 1.2 {
+  SELECT * FROM t1;
+} {1 y}
+
+do_execsql_test 1.3 {
+  SELECT __hidden__a, * FROM t1;
+} {{} 1 x y}
+
+foreach {tn view} {
+  1 { CREATE VIEW v1(a, b, __hidden__c) AS SELECT a, b, c FROM x1 }
+  2 { CREATE VIEW v1 AS SELECT a, b, c AS __hidden__c FROM x1 }
+} {
+  do_execsql_test 2.$tn.1 {
+    DROP TABLE IF EXISTS x1;
+    CREATE TABLE x1(a, b, c);
+    INSERT INTO x1 VALUES(1, 2, 3);
+  }
+
+  catchsql { DROP VIEW v1 }
+  execsql $view
+
+  do_execsql_test 2.$tn.2 {
+    SELECT a, b, __hidden__c FROM v1;
+  } {1 2 3}
+  
+  do_execsql_test 2.$tn.3 {
+    SELECT * FROM v1;
+  } {1 2}
+  
+  do_execsql_test 2.$tn.4 {
+    CREATE TRIGGER tr1 INSTEAD OF INSERT ON v1 BEGIN
+      INSERT INTO x1 VALUES(new.a, new.b, new.__hidden__c);
+    END;
+  
+    INSERT INTO v1 VALUES(4, 5);
+    SELECT * FROM x1;
+  } {1 2 3 4 5 {}}
+  
+  do_execsql_test 2.$tn.5 {
+    INSERT INTO v1(a, b, __hidden__c) VALUES(7, 8, 9);
+    SELECT * FROM x1;
+  } {1 2 3 4 5 {} 7 8 9}
+}
+
+#-------------------------------------------------------------------------
+# Test INSERT INTO ... SELECT ... statements that write to tables with
+# hidden columns.
+#
+do_execsql_test 3.1 {
+  CREATE TABLE t4(a, __hidden__b, c);
+  INSERT INTO t4 SELECT 1, 2;
+  SELECT a, __hidden__b, c FROM t4;
+} {1 {} 2}
+
+do_execsql_test 3.2.1 {
+  CREATE TABLE t5(__hidden__a, b, c);
+  CREATE TABLE t6(__hidden__a, b, c);
+  INSERT INTO t6(__hidden__a, b, c) VALUES(1, 2, 3);
+  INSERT INTO t6(__hidden__a, b, c) VALUES(4, 5, 6);
+  INSERT INTO t6(__hidden__a, b, c) VALUES(7, 8, 9);
+}
+
+do_execsql_test 3.2.2 {
+  INSERT INTO t5 SELECT * FROM t6;
+  SELECT * FROM t5;
+} {2 3   5 6   8 9}
+
+do_execsql_test 3.2.3 {
+  SELECT __hidden__a FROM t5;
+} {{} {} {}}
+
+
+do_execsql_test 3.3.1 {
+  CREATE TABLE t5a(a, b, __hidden__c);
+  CREATE TABLE t6a(a, b, __hidden__c);
+  INSERT INTO t6a(a, b, __hidden__c) VALUES(1, 2, 3);
+  INSERT INTO t6a(a, b, __hidden__c) VALUES(4, 5, 6);
+  INSERT INTO t6a(a, b, __hidden__c) VALUES(7, 8, 9);
+}
+
+do_execsql_test 3.3.2 {
+  INSERT INTO t5a SELECT * FROM t6a;
+  SELECT * FROM t5a;
+} {1 2   4 5   7 8}
+
+do_execsql_test 3.3.3 {
+  SELECT __hidden__c FROM t5a;
+} {{} {} {}}
+
+do_execsql_test 3.4.1 {
+  CREATE TABLE t5b(a, __hidden__b, c);
+  CREATE TABLE t6b(a, b, __hidden__c);
+  INSERT INTO t6b(a, b, __hidden__c) VALUES(1, 2, 3);
+  INSERT INTO t6b(a, b, __hidden__c) VALUES(4, 5, 6);
+  INSERT INTO t6b(a, b, __hidden__c) VALUES(7, 8, 9);
+}
+
+do_execsql_test 3.4.2 {
+  INSERT INTO t5b SELECT * FROM t6b;
+  SELECT * FROM t5b;
+} {1 2   4 5   7 8}
+
+do_execsql_test 3.4.3 {
+  SELECT __hidden__b FROM t5b;
+} {{} {} {}}
+
+#-------------------------------------------------------------------------
+# Test VACUUM
+#
+reset_db
+do_execsql_test 4.1 {
+  CREATE TABLE t1(a, __hidden__b, c UNIQUE);
+  INSERT INTO t1(a, __hidden__b, c) VALUES(1, 2, 3);
+  INSERT INTO t1(a, __hidden__b, c) VALUES(4, 5, 6);
+  INSERT INTO t1(a, __hidden__b, c) VALUES(7, 8, 9);
+  DELETE FROM t1 WHERE __hidden__b = 5;
+  SELECT rowid, a, __hidden__b, c FROM t1;
+} {1 1 2 3   3 7 8 9}
+do_execsql_test 4.2 {
+  VACUUM;
+  SELECT rowid, a, __hidden__b, c FROM t1;
+} {1 1 2 3   3 7 8 9}
+
+finish_test