1 files changed, 23 insertions, 0 deletions
diff --git a/src/backend/nodes/bitmapset.c b/src/backend/nodes/bitmapset.c
index 648cc1a7eb3..f711e6c6995 100644
--- a/src/backend/nodes/bitmapset.c
+++ b/src/backend/nodes/bitmapset.c
@@ -1167,3 +1167,26 @@ bms_hash_value(const Bitmapset *a)
 	return DatumGetUInt32(hash_any((const unsigned char *) a->words,
 								   (lastword + 1) * sizeof(bitmapword)));
 }
+
+/*
+ * bitmap_hash - hash function for keys that are (pointers to) Bitmapsets
+ *
+ * Note: don't forget to specify bitmap_match as the match function!
+ */
+uint32
+bitmap_hash(const void *key, Size keysize)
+{
+	Assert(keysize == sizeof(Bitmapset *));
+	return bms_hash_value(*((const Bitmapset *const *) key));
+}
+
+/*
+ * bitmap_match - match function to use with bitmap_hash
+ */
+int
+bitmap_match(const void *key1, const void *key2, Size keysize)
+{
+	Assert(keysize == sizeof(Bitmapset *));
+	return !bms_equal(*((const Bitmapset *const *) key1),
+					  *((const Bitmapset *const *) key2));
+}