Adding parser support for AT TIME ZONE (#215)

* Adding parser support for AT TIME ZONE Signed-off-by: Rishabh Tanwar <[email protected]> Co-authored-by: Ashish Prasad <[email protected]> Co-authored-by: Sai Rohan Basa <[email protected]> Task: BABEL-4412
babelfish-for-postgresql · Sep 26, 2023 · 1f0851f · 1f0851f
1 parent c7572cd
commit 1f0851f
Showing 1 changed file with 14 additions and 4 deletions.
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
@@ -14539,10 +14539,20 @@ a_expr:		c_expr									{ $$ = $1; }
 				}
 			| a_expr AT TIME ZONE a_expr			%prec AT
 				{
-					$$ = (Node *) makeFuncCall(SystemFuncName("timezone"),
-											   list_make2($5, $1),
-											   COERCE_SQL_SYNTAX,
-											   @2);
+					if(sql_dialect == SQL_DIALECT_TSQL)
+					{
+						$$ = (Node *) makeFuncCall(list_make2(makeString("sys"), makeString("timezone")),
+													list_make2($5, $1),
+													COERCE_SQL_SYNTAX,
+													@2);
+					}
+					else
+					{
+						$$ = (Node *) makeFuncCall(SystemFuncName("timezone"),
+													list_make2($5, $1),
+													COERCE_SQL_SYNTAX,
+													@2);
+					}
 				}
 		/*
 		 * These operators must be called out explicitly in order to make use