Add support for PostgreSQL 18 (#145)

- Fixed compiler errors and warnings.
- Added expected/pg_ivm_0.out to accommodate message changes introduced in PostgreSQL 18.

createas.c

@@ -101,7 +101,11 @@ create_immv_internal(List *attrList, IntoClause *into)
 	CreateStmt *create = makeNode(CreateStmt);
 	char		relkind;
 	Datum		toast_options;
+#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 180000)
+	const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
+#else
 	static char *validnsps[] = HEAP_RELOPT_NAMESPACES;
+#endif
 	ObjectAddress intoRelationAddr;
 
 	/* This code supports both CREATE TABLE AS and CREATE MATERIALIZED VIEW */
@@ -148,7 +152,12 @@ create_immv_internal(List *attrList, IntoClause *into)
 	NewRelationCreateToastTable(intoRelationAddr.objectId, toast_options);
 
 	/* Create the "view" part of an IMMV. */
+#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 180000)
+	StoreImmvQuery(intoRelationAddr.objectId, into->viewQuery);
+#else
 	StoreImmvQuery(intoRelationAddr.objectId, (Query *) into->viewQuery);
+#endif
+
 	CommandCounterIncrement();
 
 	return intoRelationAddr;
@@ -1514,10 +1523,18 @@ CreateIndexOnIMMV(Query *query, Relation matviewRel)
 
 		indexRel = index_open(indexoid, AccessShareLock);
 
+#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 180000)
+		if (CheckIndexCompatible(indexRel->rd_id,
+								index->accessMethod,
+								index->indexParams,
+								index->excludeOpNames,
+								false))
+#else
 		if (CheckIndexCompatible(indexRel->rd_id,
 								index->accessMethod,
 								index->indexParams,
 								index->excludeOpNames))
+#endif
 			hasCompatibleIndex = true;
 
 		index_close(indexRel, AccessShareLock);

expected/pg_ivm.out

@@ -1395,6 +1395,8 @@ CREATE FUNCTION mytype_out(mytype)
  RETURNS cstring AS 'int4out'
  LANGUAGE INTERNAL STRICT IMMUTABLE;
 NOTICE:  argument type mytype is only a shell
+LINE 1: CREATE FUNCTION mytype_out(mytype)
+                                   ^
 CREATE TYPE mytype (
  LIKE = int4,
  INPUT = mytype_in,

matview.c

@@ -617,7 +617,11 @@ refresh_immv_datafill(DestReceiver *dest, Query *query,
 	ExecutorStart(queryDesc, 0);
 
 	/* run the plan */
+#if PG_VERSION_NUM < 180000
 	ExecutorRun(queryDesc, ForwardScanDirection, 0, true);
+#else
+	ExecutorRun(queryDesc, ForwardScanDirection, 0);
+#endif
 
 	processed = queryDesc->estate->es_processed;
 

pg_ivm.c

@@ -224,7 +224,11 @@ create_immv(PG_FUNCTION_ARGS)
 	ctas->into->options = NIL;
 	ctas->into->onCommit = ONCOMMIT_NOOP;
 	ctas->into->tableSpaceName = NULL;
+#if defined(PG_VERSION_NUM) && (PG_VERSION_NUM >= 180000)
+	ctas->into->viewQuery = (Query *) parsetree->stmt;
+#else
 	ctas->into->viewQuery = parsetree->stmt;
+#endif
 	ctas->into->skipData = false;
 
 	query = transformStmt(pstate, (Node *) ctas);