Rename gist stratnum support function

Commit 7406ab623fe added a gist support function that we internally
refer to by the symbol GIST_STRATNUM_PROC.  This translated from
"well-known" strategy numbers to opfamily-specific strategy numbers.
However, we later (commit 630f9a43cec) changed this to fit into
index-AM-level compare type mapping, so this function actually now
maps from compare type to opfamily-specific strategy numbers.  So this
name is no longer fitting.

Moreover, the index AM level also supports the opposite, a function to
map from strategy number to compare type.  This is currently not
supported in gist, but one might wonder what this function is supposed
to be called when it is added.

This patch changes the naming of the gist-level functionality to be
more in line with the index-AM-level functionality.  This makes sense
because these are essentially the same thing on different levels.
This also changes the names of the externally visible functions that
are provided for use as such a support function.

Reviewed-by: Paul A Jungwirth <pj@illuminatedcomputing.com>
Discussion: https://www.postgresql.org/message-id/37ebb1d9-9036-485f-a215-e55435689917%40eisentraut.org

2 files changed, 10 insertions, 10 deletions

diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index a6b701943d3..c0aa7d0222f 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1058,11 +1058,11 @@ gistGetFakeLSN(Relation rel)
 }
 
 /*
- * This is a stratnum support function for GiST opclasses that use the
- * RT*StrategyNumber constants.
+ * This is a stratnum translation support function for GiST opclasses that use
+ * the RT*StrategyNumber constants.
  */
 Datum
-gist_stratnum_common(PG_FUNCTION_ARGS)
+gist_translate_cmptype_common(PG_FUNCTION_ARGS)
 {
 	CompareType cmptype = PG_GETARG_INT32(0);
 
@@ -1090,9 +1090,9 @@ gist_stratnum_common(PG_FUNCTION_ARGS)
 /*
  * Returns the opclass's private stratnum used for the given compare type.
  *
- * Calls the opclass's GIST_STRATNUM_PROC support function, if any,
- * and returns the result.
- * Returns InvalidStrategy if the function is not defined.
+ * Calls the opclass's GIST_TRANSLATE_CMPTYPE_PROC support function, if any,
+ * and returns the result.  Returns InvalidStrategy if the function is not
+ * defined.
  */
 StrategyNumber
 gisttranslatecmptype(CompareType cmptype, Oid opfamily)
@@ -1101,7 +1101,7 @@ gisttranslatecmptype(CompareType cmptype, Oid opfamily)
 	Datum		result;
 
 	/* Check whether the function is provided. */
-	funcid = get_opfamily_proc(opfamily, ANYOID, ANYOID, GIST_STRATNUM_PROC);
+	funcid = get_opfamily_proc(opfamily, ANYOID, ANYOID, GIST_TRANSLATE_CMPTYPE_PROC);
 	if (!OidIsValid(funcid))
 		return InvalidStrategy;
 
diff --git a/src/backend/access/gist/gistvalidate.c b/src/backend/access/gist/gistvalidate.c
index 2a49e6d20f0..2ed6f74fce9 100644
--- a/src/backend/access/gist/gistvalidate.c
+++ b/src/backend/access/gist/gistvalidate.c
@@ -138,7 +138,7 @@ gistvalidate(Oid opclassoid)
 				ok = check_amproc_signature(procform->amproc, VOIDOID, true,
 											1, 1, INTERNALOID);
 				break;
-			case GIST_STRATNUM_PROC:
+			case GIST_TRANSLATE_CMPTYPE_PROC:
 				ok = check_amproc_signature(procform->amproc, INT2OID, true,
 											1, 1, INT4OID) &&
 					procform->amproclefttype == ANYOID &&
@@ -265,7 +265,7 @@ gistvalidate(Oid opclassoid)
 		if (i == GIST_DISTANCE_PROC || i == GIST_FETCH_PROC ||
 			i == GIST_COMPRESS_PROC || i == GIST_DECOMPRESS_PROC ||
 			i == GIST_OPTIONS_PROC || i == GIST_SORTSUPPORT_PROC ||
-			i == GIST_STRATNUM_PROC)
+			i == GIST_TRANSLATE_CMPTYPE_PROC)
 			continue;			/* optional methods */
 		ereport(INFO,
 				(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
@@ -336,7 +336,7 @@ gistadjustmembers(Oid opfamilyoid,
 			case GIST_FETCH_PROC:
 			case GIST_OPTIONS_PROC:
 			case GIST_SORTSUPPORT_PROC:
-			case GIST_STRATNUM_PROC:
+			case GIST_TRANSLATE_CMPTYPE_PROC:
 				/* Optional, so force it to be a soft family dependency */
 				op->ref_is_hard = false;
 				op->ref_is_family = true;