Add index-only scan support to inet GiST opclass.

Andreas Karlsson

src/backend/utils/adt/network_gist.c

@@ -587,6 +587,33 @@ inet_gist_decompress(PG_FUNCTION_ARGS)
 	PG_RETURN_POINTER(entry);
 }
 
+/*
+ * The GiST fetch function
+ *
+ * Reconstruct the original inet datum from a GistInetKey.
+ */
+Datum
+inet_gist_fetch(PG_FUNCTION_ARGS)
+{
+	GISTENTRY	*entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+	GistInetKey	*key = DatumGetInetKeyP(entry->key);
+	GISTENTRY	*retval;
+	inet		*dst;
+
+	dst = (inet *) palloc0(sizeof(inet));
+
+	ip_family(dst) = gk_ip_family(key);
+	ip_bits(dst) = gk_ip_minbits(key);
+	memcpy(ip_addr(dst), gk_ip_addr(key), ip_addrsize(dst));
+	SET_INET_VARSIZE(dst);
+
+	retval = palloc(sizeof(GISTENTRY));
+	gistentryinit(*retval, InetPGetDatum(dst), entry->rel, entry->page,
+				  entry->offset, FALSE);
+
+	PG_RETURN_POINTER(retval);
+}
+
 /*
  * The GiST page split penalty function
  *

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201503261
+#define CATALOG_VERSION_NO	201503281
 
 #endif

src/include/catalog/pg_amproc.h

@@ -411,6 +411,7 @@ DATA(insert (	3550   869	869  4 3556 ));
 DATA(insert (	3550   869	869  5 3557 ));
 DATA(insert (	3550   869	869  6 3558 ));
 DATA(insert (	3550   869	869  7 3559 ));
+DATA(insert (	3550   869	869  9 3573 ));
 
 /* sp-gist */
 DATA(insert (	3474   3831 3831 1 3469 ));

src/include/catalog/pg_proc.h

@@ -2240,6 +2240,8 @@ DATA(insert OID = 3555 (  inet_gist_compress	PGNSP PGUID 12 1 0 0 0 f f f f t f
 DESCR("GiST support");
 DATA(insert OID = 3556 (  inet_gist_decompress	PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 2281 "2281" _null_ _null_ _null_ _null_ inet_gist_decompress _null_ _null_ _null_ ));
 DESCR("GiST support");
+DATA(insert OID = 3573 (  inet_gist_fetch		PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 2281 "2281" _null_ _null_ _null_ _null_ inet_gist_fetch _null_ _null_ _null_ ));
+DESCR("GiST support");
 DATA(insert OID = 3557 (  inet_gist_penalty		PGNSP PGUID 12 1 0 0 0 f f f f t f i 3 0 2281 "2281 2281 2281" _null_ _null_ _null_ _null_ inet_gist_penalty _null_ _null_ _null_ ));
 DESCR("GiST support");
 DATA(insert OID = 3558 (  inet_gist_picksplit	PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 2281 "2281 2281" _null_ _null_ _null_ _null_ inet_gist_picksplit _null_ _null_ _null_ ));

src/include/utils/inet.h

@@ -123,6 +123,7 @@ extern int	bitncommon(const unsigned char *l, const unsigned char *r, int n);
 /*
  * GiST support functions in network_gist.c
  */
+extern Datum inet_gist_fetch(PG_FUNCTION_ARGS);
 extern Datum inet_gist_consistent(PG_FUNCTION_ARGS);
 extern Datum inet_gist_union(PG_FUNCTION_ARGS);
 extern Datum inet_gist_compress(PG_FUNCTION_ARGS);

src/test/regress/expected/inet.out

@@ -390,6 +390,25 @@ SELECT * FROM inet_tbl WHERE i <> '192.168.1.0/24'::cidr ORDER BY i;
  10:23::8000/113    | 10:23::ffff
 (16 rows)
 
+-- test index-only scans
+EXPLAIN (COSTS OFF)
+SELECT i FROM inet_tbl WHERE i << '192.168.1.0/24'::cidr ORDER BY i;
+                    QUERY PLAN                     
+---------------------------------------------------
+ Sort
+   Sort Key: i
+   ->  Index Only Scan using inet_idx2 on inet_tbl
+         Index Cond: (i << '192.168.1.0/24'::inet)
+(4 rows)
+
+SELECT i FROM inet_tbl WHERE i << '192.168.1.0/24'::cidr ORDER BY i;
+        i         
+------------------
+ 192.168.1.0/25
+ 192.168.1.255/25
+ 192.168.1.226
+(3 rows)
+
 SET enable_seqscan TO on;
 DROP INDEX inet_idx2;
 -- simple tests of inet boolean and arithmetic operators

src/test/regress/sql/inet.sql

@@ -84,6 +84,12 @@ SELECT * FROM inet_tbl WHERE i = '192.168.1.0/24'::cidr ORDER BY i;
 SELECT * FROM inet_tbl WHERE i >= '192.168.1.0/24'::cidr ORDER BY i;
 SELECT * FROM inet_tbl WHERE i > '192.168.1.0/24'::cidr ORDER BY i;
 SELECT * FROM inet_tbl WHERE i <> '192.168.1.0/24'::cidr ORDER BY i;
+
+-- test index-only scans
+EXPLAIN (COSTS OFF)
+SELECT i FROM inet_tbl WHERE i << '192.168.1.0/24'::cidr ORDER BY i;
+SELECT i FROM inet_tbl WHERE i << '192.168.1.0/24'::cidr ORDER BY i;
+
 SET enable_seqscan TO on;
 DROP INDEX inet_idx2;