From d25367ec4f869aac80e97964fa5d7143536818b1 Mon Sep 17 00:00:00 2001
From: Tom Lane
Date: Fri, 28 Nov 2014 14:16:24 -0500
Subject: Add bms_get_singleton_member(), and use it where appropriate.

This patch adds a function that replaces a bms_membership() test followed
by a bms_singleton_member() call, performing both the test and the
extraction of a singleton set's member in one scan of the bitmapset.
The performance advantage over the old way is probably minimal in current
usage, but it seems worthwhile on notational grounds anyway.

David Rowley
---
 src/include/nodes/bitmapset.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/include/nodes')

diff --git a/src/include/nodes/bitmapset.h b/src/include/nodes/bitmapset.h
index a78ff4886d6..a314192b71a 100644
--- a/src/include/nodes/bitmapset.h
+++ b/src/include/nodes/bitmapset.h
@@ -72,6 +72,7 @@ extern bool bms_is_member(int x, const Bitmapset *a);
 extern bool bms_overlap(const Bitmapset *a, const Bitmapset *b);
 extern bool bms_nonempty_difference(const Bitmapset *a, const Bitmapset *b);
 extern int	bms_singleton_member(const Bitmapset *a);
+extern bool bms_get_singleton_member(const Bitmapset *a, int *member);
 extern int	bms_num_members(const Bitmapset *a);
 
 /* optimized tests when we don't need to know exact membership count: */
-- 
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