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+# 2006 October 19
+#
+# The author disclaims copyright to this source code.
+#
+#*************************************************************************
+# This file implements regression tests for SQLite library.  The focus
+# of this script is testing handling of edge cases for various doclist
+# merging functions in the FTS3 module query logic.
+#
+# $Id: fts3ag.test,v 1.2 2007/11/16 00:23:08 shess Exp $
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# If SQLITE_ENABLE_FTS3 is defined, omit this file.
+ifcapable !fts3 {
+  finish_test
+  return
+}
+
+db eval {
+  CREATE VIRTUAL TABLE t1 USING fts3(content);
+  INSERT INTO t1 (rowid, content) VALUES(1, 'this is a test');
+  INSERT INTO t1 (rowid, content) VALUES(2, 'also a test');
+}
+
+# No hits at all.  Returns empty doclists from termSelect().
+do_test fts3ag-1.1 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'something'}
+} {}
+
+# Empty left in docListExceptMerge().
+do_test fts3ag-1.2 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH '-this something'}
+} {}
+
+# Empty right in docListExceptMerge().
+do_test fts3ag-1.3 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'this -something'}
+} {1}
+
+# Empty left in docListPhraseMerge().
+do_test fts3ag-1.4 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH '"this something"'}
+} {}
+
+# Empty right in docListPhraseMerge().
+do_test fts3ag-1.5 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH '"something is"'}
+} {}
+
+# Empty left in docListOrMerge().
+do_test fts3ag-1.6 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'something OR this'}
+} {1}
+
+# Empty right in docListOrMerge().
+do_test fts3ag-1.7 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'this OR something'}
+} {1}
+
+# Empty left in docListAndMerge().
+do_test fts3ag-1.8 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'something this'}
+} {}
+
+# Empty right in docListAndMerge().
+do_test fts3ag-1.9 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'this something'}
+} {}
+
+# No support for all-except queries.
+do_test fts3ag-1.10 {
+  catchsql {SELECT rowid FROM t1 WHERE t1 MATCH '-this -something'}
+} {1 {malformed MATCH expression: [-this -something]}}
+
+# Test that docListOrMerge() correctly handles reaching the end of one
+# doclist before it reaches the end of the other.
+do_test fts3ag-1.11 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'this OR also'}
+} {1 2}
+do_test fts3ag-1.12 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'also OR this'}
+} {1 2}
+
+# Empty left and right in docListOrMerge().  Each term matches neither
+# row, and when combined there was an assertion failure.
+do_test fts3ag-1.13 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'something OR nothing'}
+} {}
+
+finish_test