lvyanquan commented on code in PR #3893:
URL: https://github.com/apache/flink-cdc/pull/3893#discussion_r2964097880


##########
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/main/java/org/apache/flink/cdc/connectors/mysql/source/parser/CustomAlterTableParserListener.java:
##########
@@ -479,14 +487,26 @@ public void 
enterTableOptionComment(MySqlParser.TableOptionCommentContext ctx) {
                     () -> {
                         if (ctx.COMMENT() != null) {
                             tableEditor.setComment(
-                                    
parser.withoutQuotes(ctx.STRING_LITERAL().getText()));
+                                    AbstractDdlParser.withoutQuotes(
+                                            ctx.STRING_LITERAL().getText()));
                         }
                     },
                     tableEditor);
         }
         super.enterTableOptionComment(ctx);
     }
 
+    @Override
+    public void exitTableOptionComment(MySqlParser.TableOptionCommentContext 
ctx) {
+        if (!parser.skipComments() && tableEditor.hasComment()) {
+            changes.add(
+                    new AlterTableCommentEvent(

Review Comment:
   AlterTableCommentEvent will also be created when processing `CREATE TABLE` 
event, which is not as expected.



##########
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/main/java/org/apache/flink/cdc/connectors/mysql/source/parser/CustomAlterTableParserListener.java:
##########
@@ -479,14 +487,26 @@ public void 
enterTableOptionComment(MySqlParser.TableOptionCommentContext ctx) {
                     () -> {
                         if (ctx.COMMENT() != null) {
                             tableEditor.setComment(
-                                    
parser.withoutQuotes(ctx.STRING_LITERAL().getText()));
+                                    AbstractDdlParser.withoutQuotes(
+                                            ctx.STRING_LITERAL().getText()));
                         }
                     },
                     tableEditor);
         }
         super.enterTableOptionComment(ctx);
     }
 
+    @Override
+    public void exitTableOptionComment(MySqlParser.TableOptionCommentContext 
ctx) {
+        if (!parser.skipComments() && tableEditor.hasComment()) {
+            changes.add(
+                    new AlterTableCommentEvent(

Review Comment:
   `AlterTableCommentEvent` will also be created when processing `CREATE TABLE` 
event, which is not as expected.



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