From 96dbbf828c5f188e9fec0b706ad33c20900f918d Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 17 Jul 2022 17:43:28 -0400
Subject: [PATCH] Fix omissions in support for the "regcollation" type.

The patch that added regcollation doesn't seem to have been too
thorough about supporting it everywhere that other reg* types
are supported.  Fix that.  (The find_expr_references omission
is moderately serious, since it could result in missing expression
dependencies.  The others are less exciting.)

Noted while fixing bug #17483.  Back-patch to v13 where
regcollation was added.

Discussion: https://postgr.es/m/1423433.1652722406@sss.pgh.pa.us
---
 src/backend/catalog/dependency.c   | 7 +++++++
 src/backend/utils/adt/selfuncs.c   | 2 ++
 src/backend/utils/cache/catcache.c | 1 +
 3 files changed, 10 insertions(+)

diff --git a/src/backend/catalog/dependency.c b/src/backend/catalog/dependency.c
index de109233910..f10abd78b70 100644
--- a/src/backend/catalog/dependency.c
+++ b/src/backend/catalog/dependency.c
@@ -1840,6 +1840,13 @@ find_expr_references_walker(Node *node,
 						add_object_address(OCLASS_TYPE, objoid, 0,
 										   context->addrs);
 					break;
+				case REGCOLLATIONOID:
+					objoid = DatumGetObjectId(con->constvalue);
+					if (SearchSysCacheExists1(COLLOID,
+											  ObjectIdGetDatum(objoid)))
+						add_object_address(OCLASS_COLLATION, objoid, 0,
+										   context->addrs);
+					break;
 				case REGCONFIGOID:
 					objoid = DatumGetObjectId(con->constvalue);
 					if (SearchSysCacheExists1(TSCONFIGOID,
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c
index fa1f589fad8..18849183182 100644
--- a/src/backend/utils/adt/selfuncs.c
+++ b/src/backend/utils/adt/selfuncs.c
@@ -4326,6 +4326,7 @@ convert_to_scalar(Datum value, Oid valuetypid, Oid collid, double *scaledvalue,
 		case REGOPERATOROID:
 		case REGCLASSOID:
 		case REGTYPEOID:
+		case REGCOLLATIONOID:
 		case REGCONFIGOID:
 		case REGDICTIONARYOID:
 		case REGROLEOID:
@@ -4457,6 +4458,7 @@ convert_numeric_to_scalar(Datum value, Oid typid, bool *failure)
 		case REGOPERATOROID:
 		case REGCLASSOID:
 		case REGTYPEOID:
+		case REGCOLLATIONOID:
 		case REGCONFIGOID:
 		case REGDICTIONARYOID:
 		case REGROLEOID:
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index 6ae7c1f50b8..38e943fab2b 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -240,6 +240,7 @@ GetCCHashEqFuncs(Oid keytype, CCHashFN *hashfunc, RegProcedure *eqfunc, CCFastEq
 		case REGOPERATOROID:
 		case REGCLASSOID:
 		case REGTYPEOID:
+		case REGCOLLATIONOID:
 		case REGCONFIGOID:
 		case REGDICTIONARYOID:
 		case REGROLEOID: