Comma is optional in table options of ALTER

Author: jpechane

mysql/MySqlParser.g4

@@ -578,7 +578,7 @@ alterView
 // details
 
 alterSpecification
-    : tableOption                                                   #alterByTableOption
+    : tableOption (','? tableOption)*                               #alterByTableOption
     | ADD COLUMN? uid columnDefinition (FIRST | AFTER uid)?         #alterByAddColumn
     | ADD COLUMN?
         '('

mysql/examples/ddl_alter.sql

@@ -18,7 +18,8 @@ alter table with_check add constraint c2 check (c1 in (1, 2, 3, 4));
 alter table with_check add check (c1 in (1, 2, 3, 4));
 alter table with_partition add partition (partition p201901 values less than (737425) engine = InnoDB);
 alter table with_partition add partition (partition p1 values less than (837425) engine = InnoDB, partition p2 values less than (MAXVALUE) engine = InnoDB);
-
+alter table t1 stats_auto_recalc=default stats_sample_pages=50;
+alter table t1 stats_auto_recalc=default, stats_sample_pages=50;
 #end
 #begin
 -- Alter database