ThorneANN opened a new pull request, #4219:
URL: https://github.com/apache/flink-cdc/pull/4219

   This commit enhances the MySQL CDC connectors to correctly parse DDL 
statements
   containing both single quotes and double quotes in DEFAULT VALUE and COMMENT 
clauses.
   
   Changes:
   - 
[flink-connector-mysql-cdc](https://issues.apache.org/jira/browse/FLINK-connector-mysql-cdc):
 Updated DefaultValueParserListener.unquote() to handle
     both single and double quotes for DEFAULT VALUE parsing
   - 
[flink-cdc-pipeline-connector-mysql](https://issues.apache.org/jira/browse/FLINK-cdc-pipeline-connector-mysql):
 Added MySqlSchemaUtils.removeQuotes() utility
     method to handle both quote types for COMMENT parsing
   - Updated CustomColumnDefinitionParserListener and 
CustomAlterTableParserListener
     to use the new removeQuotes() method
   
   Tests:
   - Added DefaultValueParserListenerTest with 5 unit tests
   - Added MySqlSchemaUtilsTest with 7 unit tests
   - Added MySqlCommentParsingITCase with 4 integration tests
   
   This change ensures robust parsing of binlog events that may use either 
single
   or double quotes, as MySQL normalizes double quotes to single quotes in
   SHOW CREATE TABLE output but binlog events may contain either type.


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