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tidb/parser/ast
wuudjac c938f62ea5 [parser] parser: add charset validation (TiDB #4436) (#220)
* Add charset validation in pattern `CharsetName`, and use it in syntax `CONVERT(expr USING transcoding_name)` and `CHAR(N USING charset_name)`.
* Modify `yyLexer` interface to return different types of error.
2021-10-09 14:53:23 +08:00
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