Implement IF NOT EXIST for CREATE INDEX.

Fabrízio de Royes Mello, reviewed by Marti Raudsepp, Adam Brightwell and me.

src/backend/catalog/index.c

@@ -674,6 +674,8 @@ UpdateIndexRelation(Oid indexoid,
  *		will be marked "invalid" and the caller must take additional steps
  *		to fix it up.
  * is_internal: if true, post creation hook for new index
+ * if_not_exists: if true, do not throw an error if a relation with
+ * 	the same name already exists.
  *
  * Returns the OID of the created index.
  */
@@ -697,7 +699,8 @@ index_create(Relation heapRelation,
 			 bool allow_system_table_mods,
 			 bool skip_build,
 			 bool concurrent,
-			 bool is_internal)
+			 bool is_internal,
+			 bool if_not_exists)
 {
 	Oid			heapRelationId = RelationGetRelid(heapRelation);
 	Relation	pg_class;
@@ -773,10 +776,22 @@ index_create(Relation heapRelation,
 		elog(ERROR, "shared relations must be placed in pg_global tablespace");
 
 	if (get_relname_relid(indexRelationName, namespaceId))
+	{
+		if (if_not_exists)
+		{
+			ereport(NOTICE,
+					(errcode(ERRCODE_DUPLICATE_TABLE),
+					 errmsg("relation \"%s\" already exists, skipping",
+							indexRelationName)));
+			heap_close(pg_class, RowExclusiveLock);
+			return InvalidOid;
+		}
+
 		ereport(ERROR,
 				(errcode(ERRCODE_DUPLICATE_TABLE),
 				 errmsg("relation \"%s\" already exists",
 						indexRelationName)));
+	}
 
 	/*
 	 * construct tuple descriptor for index tuples