canal can't parse value of ddl

[BLAZZ]

canal.valueExpr can't work

ALTER TABLE `sometable` MODIFY COLUMN `some_col` varchar(1024) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '' COMMENT 'comments' AFTER `other_col`

become

ALTER TABLE `sometable` MODIFY COLUMN `some_col` VARCHAR(1024) CHARACTER SET UTF8 COLLATE utf8_bin NOT NULL DEFAULT  COMMENT  AFTER `other_col`

after (*ast.AlterTableStmt).Restore(ctx *format.RestoreCtx), default value and comment value lost

change "github.com/pingcap/parser" test_driver to public or copy the implements to canal?

[lance6716]

I didn't find where go-mysql uses (*ast.AlterTableStmt).Restore(ctx *format.RestoreCtx), can you explain it?

[BLAZZ]

AlterTableStmt is parsed from replication.QueryEvent, and send to eventHandler.OnDDL, use (*ast.AlterTableStmt).Restore(ctx *format.RestoreCtx) is easy to sync ddl to the target database when using canal

[lance6716]

So where does go-mysql use (*ast.AlterTableStmt).Restore(ctx *format.RestoreCtx)? If it's used in your application, you can change your code rather than go-mysql