Allow a string argument to the EXTRACT() function.

 This is an extension to the SQL9x standard, but is consistant with usage
 of the underlying date_part() function used to implement it.
 Example: EXTRACT('YEAR',...)
No impact on regression tests.

diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 0786e64630409d1fd12832ff61ac0e2ca9a72293..beb0916cee68d2ccdbfc33e23c91bfe56952858b 100644 (file)
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -4986,8 +4986,13 @@ extract_list:  extract_arg FROM a_expr
                                {       $$ = NIL; }
                ;
 
+/* Allow delimited string SCONST in extract_arg as an SQL extension.
+ * - thomas 2001-04-12
+ */
+
 extract_arg:  datetime                                         { $$ = $1; }
-               | IDENT                                         { $$ = $1; }
+               | SCONST                                                        { $$ = $1; }
+               | IDENT                                                         { $$ = $1; }
                | TIMEZONE_HOUR                                         { $$ = "tz_hour"; }
                | TIMEZONE_MINUTE                                       { $$ = "tz_minute"; }
                ;