On 03/28/2015 09:36 PM, Andreas Karlsson wrote:
Thanks! Do you know if it is possible to add index-only scan support to
range indexes? I have never looked at those and do not know if they are
lossy.
Seems like range types are not compressed at all so implementing
index-only scans was trivial. A patch is attached.
--
Andreas Karlsson
diff --git a/src/backend/utils/adt/rangetypes_gist.c b/src/backend/utils/adt/rangetypes_gist.c
index c1ff471..dea8f04 100644
--- a/src/backend/utils/adt/rangetypes_gist.c
+++ b/src/backend/utils/adt/rangetypes_gist.c
@@ -216,7 +216,7 @@ range_gist_union(PG_FUNCTION_ARGS)
PG_RETURN_RANGE(result_range);
}
-/* compress, decompress are no-ops */
+/* compress, decompress, fecth are no-ops */
Datum
range_gist_compress(PG_FUNCTION_ARGS)
{
@@ -233,6 +233,14 @@ range_gist_decompress(PG_FUNCTION_ARGS)
PG_RETURN_POINTER(entry);
}
+Datum
+range_gist_fetch(PG_FUNCTION_ARGS)
+{
+ GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+
+ PG_RETURN_POINTER(entry);
+}
+
/*
* GiST page split penalty function.
*
diff --git a/src/include/catalog/pg_amproc.h b/src/include/catalog/pg_amproc.h
index 037684c..e80c897 100644
--- a/src/include/catalog/pg_amproc.h
+++ b/src/include/catalog/pg_amproc.h
@@ -235,6 +235,7 @@ DATA(insert ( 3919 3831 3831 4 3878 ));
DATA(insert ( 3919 3831 3831 5 3879 ));
DATA(insert ( 3919 3831 3831 6 3880 ));
DATA(insert ( 3919 3831 3831 7 3881 ));
+DATA(insert ( 3919 3831 3831 9 3996 ));
/* gin */
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index a96d369..3cd7851 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -4951,6 +4951,8 @@ DATA(insert OID = 3877 ( range_gist_compress PGNSP PGUID 12 1 0 0 0 f f f f t f
DESCR("GiST support");
DATA(insert OID = 3878 ( range_gist_decompress PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 2281 "2281" _null_ _null_ _null_ _null_ range_gist_decompress _null_ _null_ _null_ ));
DESCR("GiST support");
+DATA(insert OID = 3996 ( range_gist_fetch PGNSP PGUID 12 1 0 0 0 f f f f t f i 1 0 2281 "2281" _null_ _null_ _null_ _null_ range_gist_fetch _null_ _null_ _null_ ));
+DESCR("GiST support");
DATA(insert OID = 3879 ( range_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_ range_gist_penalty _null_ _null_ _null_ ));
DESCR("GiST support");
DATA(insert OID = 3880 ( range_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_ range_gist_picksplit _null_ _null_ _null_ ));
diff --git a/src/include/utils/rangetypes.h b/src/include/utils/rangetypes.h
index 173bf74..43c80f4 100644
--- a/src/include/utils/rangetypes.h
+++ b/src/include/utils/rangetypes.h
@@ -209,6 +209,7 @@ extern RangeType *make_empty_range(TypeCacheEntry *typcache);
extern Datum range_gist_consistent(PG_FUNCTION_ARGS);
extern Datum range_gist_compress(PG_FUNCTION_ARGS);
extern Datum range_gist_decompress(PG_FUNCTION_ARGS);
+extern Datum range_gist_fetch(PG_FUNCTION_ARGS);
extern Datum range_gist_union(PG_FUNCTION_ARGS);
extern Datum range_gist_penalty(PG_FUNCTION_ARGS);
extern Datum range_gist_picksplit(PG_FUNCTION_ARGS);
diff --git a/src/test/regress/expected/rangetypes.out b/src/test/regress/expected/rangetypes.out
index 35d0dd3..8654e03 100644
--- a/src/test/regress/expected/rangetypes.out
+++ b/src/test/regress/expected/rangetypes.out
@@ -1072,6 +1072,25 @@ select count(*) from test_range_spgist where ir -|- int4range(100,500);
5
(1 row)
+-- test index-only scans
+explain (costs off)
+select ir from test_range_spgist where ir -|- int4range(10,20) order by ir;
+ QUERY PLAN
+------------------------------------------------------------------------
+ Sort
+ Sort Key: ir
+ -> Index Only Scan using test_range_spgist_idx on test_range_spgist
+ Index Cond: (ir -|- '[10,20)'::int4range)
+(4 rows)
+
+select ir from test_range_spgist where ir -|- int4range(10,20) order by ir;
+ ir
+------------
+ [20,30)
+ [20,30)
+ [20,10020)
+(3 rows)
+
RESET enable_seqscan;
RESET enable_indexscan;
RESET enable_bitmapscan;
diff --git a/src/test/regress/sql/rangetypes.sql b/src/test/regress/sql/rangetypes.sql
index aa026ca..af13352 100644
--- a/src/test/regress/sql/rangetypes.sql
+++ b/src/test/regress/sql/rangetypes.sql
@@ -286,6 +286,11 @@ select count(*) from test_range_spgist where ir &< int4range(100,500);
select count(*) from test_range_spgist where ir &> int4range(100,500);
select count(*) from test_range_spgist where ir -|- int4range(100,500);
+-- test index-only scans
+explain (costs off)
+select ir from test_range_spgist where ir -|- int4range(10,20) order by ir;
+select ir from test_range_spgist where ir -|- int4range(10,20) order by ir;
+
RESET enable_seqscan;
RESET enable_indexscan;
RESET enable_bitmapscan;
--
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