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Commitaf4002b

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Rename amcancrosscompare
After more discussion about commitce62f2f, rename the index AMproperty amcancrosscompare to two separate propertiesamconsistentequality and amconsistentordering. Also improve thedocumentation and update some comments that were previously missed.Reported-by: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://www.postgresql.org/message-id/flat/E1tngY6-0000UL-2n%40gemulon.postgresql.org
1 parent6da469b commitaf4002b

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12 files changed

+41
-26
lines changed

12 files changed

+41
-26
lines changed

‎contrib/bloom/blutils.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -110,7 +110,8 @@ blhandler(PG_FUNCTION_ARGS)
110110
amroutine->amcanorder= false;
111111
amroutine->amcanorderbyop= false;
112112
amroutine->amcanhash= false;
113-
amroutine->amcancrosscompare= false;
113+
amroutine->amconsistentequality= false;
114+
amroutine->amconsistentordering= false;
114115
amroutine->amcanbackward= false;
115116
amroutine->amcanunique= false;
116117
amroutine->amcanmulticol= true;

‎doc/src/sgml/indexam.sgml

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -105,8 +105,10 @@ typedef struct IndexAmRoutine
105105
bool amcanorderbyop;
106106
/* does AM support hashing using API consistent with the hash AM? */
107107
bool amcanhash;
108-
/* does AM support cross-type comparisons? */
109-
bool amcancrosscompare;
108+
/* do operators within an opfamily have consistent equality semantics? */
109+
bool amconsistentequality;
110+
/* do operators within an opfamily have consistent ordering semantics? */
111+
bool amconsistentordering;
110112
/* does AM support backward scanning? */
111113
bool amcanbackward;
112114
/* does AM support UNIQUE indexes? */

‎src/backend/access/brin/brin.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -257,7 +257,8 @@ brinhandler(PG_FUNCTION_ARGS)
257257
amroutine->amcanorder= false;
258258
amroutine->amcanorderbyop= false;
259259
amroutine->amcanhash= false;
260-
amroutine->amcancrosscompare= false;
260+
amroutine->amconsistentequality= false;
261+
amroutine->amconsistentordering= false;
261262
amroutine->amcanbackward= false;
262263
amroutine->amcanunique= false;
263264
amroutine->amcanmulticol= true;

‎src/backend/access/gin/ginutil.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -45,7 +45,8 @@ ginhandler(PG_FUNCTION_ARGS)
4545
amroutine->amcanorder= false;
4646
amroutine->amcanorderbyop= false;
4747
amroutine->amcanhash= false;
48-
amroutine->amcancrosscompare= false;
48+
amroutine->amconsistentequality= false;
49+
amroutine->amconsistentordering= false;
4950
amroutine->amcanbackward= false;
5051
amroutine->amcanunique= false;
5152
amroutine->amcanmulticol= true;

‎src/backend/access/gist/gist.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -66,7 +66,8 @@ gisthandler(PG_FUNCTION_ARGS)
6666
amroutine->amcanorder= false;
6767
amroutine->amcanorderbyop= true;
6868
amroutine->amcanhash= false;
69-
amroutine->amcancrosscompare= false;
69+
amroutine->amconsistentequality= false;
70+
amroutine->amconsistentordering= false;
7071
amroutine->amcanbackward= false;
7172
amroutine->amcanunique= false;
7273
amroutine->amcanmulticol= true;

‎src/backend/access/hash/hash.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -65,7 +65,8 @@ hashhandler(PG_FUNCTION_ARGS)
6565
amroutine->amcanorder= false;
6666
amroutine->amcanorderbyop= false;
6767
amroutine->amcanhash= true;
68-
amroutine->amcancrosscompare= true;
68+
amroutine->amconsistentequality= true;
69+
amroutine->amconsistentequality= false;
6970
amroutine->amcanbackward= true;
7071
amroutine->amcanunique= false;
7172
amroutine->amcanmulticol= false;

‎src/backend/access/nbtree/nbtree.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -108,7 +108,8 @@ bthandler(PG_FUNCTION_ARGS)
108108
amroutine->amcanorder= true;
109109
amroutine->amcanorderbyop= false;
110110
amroutine->amcanhash= false;
111-
amroutine->amcancrosscompare= true;
111+
amroutine->amconsistentequality= true;
112+
amroutine->amconsistentordering= true;
112113
amroutine->amcanbackward= true;
113114
amroutine->amcanunique= true;
114115
amroutine->amcanmulticol= true;

‎src/backend/access/spgist/spgutils.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -51,7 +51,8 @@ spghandler(PG_FUNCTION_ARGS)
5151
amroutine->amcanorder= false;
5252
amroutine->amcanorderbyop= true;
5353
amroutine->amcanhash= false;
54-
amroutine->amcancrosscompare= false;
54+
amroutine->amconsistentequality= false;
55+
amroutine->amconsistentordering= false;
5556
amroutine->amcanbackward= false;
5657
amroutine->amcanunique= false;
5758
amroutine->amcanmulticol= false;

‎src/backend/optimizer/plan/analyzejoins.c

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1083,9 +1083,10 @@ query_supports_distinctness(Query *query)
10831083
* the values are distinct. (Note: the opids entries could be cross-type
10841084
* operators, and thus not exactly the equality operators that the subquery
10851085
* would use itself. We use equality_ops_are_compatible() to check
1086-
* compatibility. That looks at btree or hash opfamily membership, and so
1087-
* should give trustworthy answers for all operators that we might need
1088-
* to deal with here.)
1086+
* compatibility. That looks at opfamily membership for index AMs that have
1087+
* declared that they support consistent equality semantics within an
1088+
* opfamily, and so should give trustworthy answers for all operators that we
1089+
* might need to deal with here.)
10891090
*/
10901091
bool
10911092
query_is_distinct_for(Query*query,List*colnos,List*opids)

‎src/backend/utils/cache/lsyscache.c

Lines changed: 13 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -690,10 +690,11 @@ get_op_btree_interpretation(Oid opno)
690690
*semantics.
691691
*
692692
* This is trivially true if they are the same operator. Otherwise,
693-
* we look to see if they can be found in the same btree or hash opfamily.
694-
* Either finding allows us to assume that they have compatible notions
695-
* of equality. (The reason we need to do these pushups is that one might
696-
* be a cross-type operator; for instance int24eq vs int4eq.)
693+
* Otherwise, we look to see if they both belong to an opfamily that
694+
* guarantees compatible semantics for equality. Either finding allows us to
695+
* assume that they have compatible notions of equality. (The reason we need
696+
* to do these pushups is that one might be a cross-type operator; for
697+
* instance int24eq vs int4eq.)
697698
*/
698699
bool
699700
equality_ops_are_compatible(Oidopno1,Oidopno2)
@@ -718,7 +719,7 @@ equality_ops_are_compatible(Oid opno1, Oid opno2)
718719
Form_pg_amopop_form= (Form_pg_amop)GETSTRUCT(op_tuple);
719720
IndexAmRoutine*amroutine=GetIndexAmRoutineByAmId(op_form->amopmethod, false);
720721

721-
if (amroutine->amcancrosscompare)
722+
if (amroutine->amconsistentequality)
722723
{
723724
if (op_in_opfamily(opno2,op_form->amopfamily))
724725
{
@@ -738,12 +739,13 @@ equality_ops_are_compatible(Oid opno1, Oid opno2)
738739
*Return true if the two given comparison operators have compatible
739740
*semantics.
740741
*
741-
* This is trivially true if they are the same operator. Otherwise,
742-
* we look to see if they can be found in the same btree opfamily.
743-
* For example, '<' and '>=' ops match if they belong to the same family.
742+
* This is trivially true if they are the same operator. Otherwise, we look
743+
* to see if they both belong to an opfamily that guarantees compatible
744+
* semantics for ordering. (For example, for btree, '<' and '>=' ops match if
745+
* they belong to the same family.)
744746
*
745-
* (This is identical to equality_ops_are_compatible(), except that we
746-
*don't bother to examine hash opclasses.)
747+
* (This is identical to equality_ops_are_compatible(), except that we check
748+
*amcanorder plus amconsistentordering instead of amconsistentequality.)
747749
*/
748750
bool
749751
comparison_ops_are_compatible(Oidopno1,Oidopno2)
@@ -768,7 +770,7 @@ comparison_ops_are_compatible(Oid opno1, Oid opno2)
768770
Form_pg_amopop_form= (Form_pg_amop)GETSTRUCT(op_tuple);
769771
IndexAmRoutine*amroutine=GetIndexAmRoutineByAmId(op_form->amopmethod, false);
770772

771-
if (amroutine->amcanorder&&amroutine->amcancrosscompare)
773+
if (amroutine->amcanorder&&amroutine->amconsistentordering)
772774
{
773775
if (op_in_opfamily(opno2,op_form->amopfamily))
774776
{

‎src/include/access/amapi.h

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -245,8 +245,10 @@ typedef struct IndexAmRoutine
245245
boolamcanorderbyop;
246246
/* does AM support hashing using API consistent with the hash AM? */
247247
boolamcanhash;
248-
/* does AM support cross-type comparisons? */
249-
boolamcancrosscompare;
248+
/* do operators within an opfamily have consistent equality semantics? */
249+
boolamconsistentequality;
250+
/* do operators within an opfamily have consistent ordering semantics? */
251+
boolamconsistentordering;
250252
/* does AM support backward scanning? */
251253
boolamcanbackward;
252254
/* does AM support UNIQUE indexes? */

‎src/test/modules/dummy_index_am/dummy_index_am.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -283,7 +283,8 @@ dihandler(PG_FUNCTION_ARGS)
283283
amroutine->amcanorder= false;
284284
amroutine->amcanorderbyop= false;
285285
amroutine->amcanhash= false;
286-
amroutine->amcancrosscompare= false;
286+
amroutine->amconsistentequality= false;
287+
amroutine->amconsistentordering= false;
287288
amroutine->amcanbackward= false;
288289
amroutine->amcanunique= false;
289290
amroutine->amcanmulticol= false;

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