From fcecc5ca1ea350db1142fdae55ab7964ebafc0dc Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Thu, 3 Sep 1998 02:34:35 +0000
Subject: [Part #1: Type: text/plain, Encoding: 7bit, Size: 59]

I will be cleaning this up more before the Oct 1 deadline.

David Hartwig.  AND/OR fix.
---
 src/backend/commands/variable.c | 50 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

(limited to 'src/backend/commands/variable.c')

diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index 2c813dcd597..9cd2c5d699c 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -2,7 +2,7 @@
  * Routines for handling of 'SET var TO',
  *	'SHOW var' and 'RESET var' statements.
  *
- * $Id: variable.c,v 1.12 1998/09/01 04:28:07 momjian Exp $
+ * $Id: variable.c,v 1.13 1998/09/03 02:34:29 momjian Exp $
  *
  */
 
@@ -24,6 +24,7 @@ extern Cost _cpu_index_page_wight_;
 extern bool _use_geqo_;
 extern int32 _use_geqo_rels_;
 extern bool _use_right_sided_plans_;
+extern bool _use_keyset_query_optimizer;
 
 /*-----------------------------------------------------------------------*/
 static const char *
@@ -558,6 +559,9 @@ struct VariableParsers
 		"server_encoding", parse_server_encoding, show_server_encoding, reset_server_encoding
 	},
 #endif
+	{
+		"ksqo", parse_ksqo, show_ksqo, reset_ksqo
+	},
 	{
 		NULL, NULL, NULL, NULL
 	}
@@ -613,3 +617,47 @@ ResetPGVariable(const char *name)
 
 	return TRUE;
 }
+
+
+/*-----------------------------------------------------------------------
+KSQO code will one day be unnecessary when the optimizer makes use of 
+indexes when multiple ORs are specified in the where clause.
+See optimizer/prep/prepkeyset.c for more on this.
+	daveh@insightdist.com    6/16/98
+-----------------------------------------------------------------------*/
+bool
+parse_ksqo(const char *value)
+{
+	if (value == NULL)
+	{
+		reset_ksqo();
+		return TRUE;
+	}
+
+	if (strcasecmp(value, "on") == 0)
+		_use_keyset_query_optimizer = true;
+	else if (strcasecmp(value, "off") == 0)
+		_use_keyset_query_optimizer = false;
+	else
+		elog(ERROR, "Bad value for Key Set Query Optimizer (%s)", value);
+
+	return TRUE;
+}
+
+bool
+show_ksqo()
+{
+
+	if (_use_keyset_query_optimizer)
+		elog(NOTICE, "Key Set Query Optimizer is ON");
+	else
+		elog(NOTICE, "Key Set Query Optimizer is OFF");
+	return TRUE;
+}
+
+bool
+reset_ksqo()
+{
+	_use_keyset_query_optimizer = false;
+	return TRUE;
+}
-- 
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