[MySql] Merge pull request antlr#2482 from Sebruck/mysql-flush-tables

Update flush table statement as per MySQL 8.0

Author: KvanTTT

sql/mysql/Positive-Technologies/MySqlParser.g4

@@ -1848,7 +1848,7 @@ flushOption
         | USER_RESOURCES | TABLES (WITH READ LOCK)?
        )                                                            #simpleFlushOption
     | RELAY LOGS channelOption?                                     #channelFlushOption
-    | TABLES tables flushTableOption?                               #tableFlushOption
+    | (TABLE | TABLES) tables? flushTableOption?                    #tableFlushOption
     ;
 
 flushTableOption

sql/mysql/Positive-Technologies/examples/ddl_flush.sql

@@ -0,0 +1,18 @@
+#begin
+flush hosts, status;
+#end
+#begin
+-- Table flushing
+flush tables;
+flush local tables Foo;
+flush tables Foo, Bar;
+flush tables Foo, Bar for export;
+flush tables Foo, Bar with read lock;
+#end
+#begin
+-- 'FLUSH TABLE' is an alias for 'FLUSH TABLES' (https://dev.mysql.com/doc/refman/8.0/en/flush.html)
+flush table;
+flush local table Foo;
+flush TABLE Foo, Bar;
+flush table Foo, Bar for export;
+#end