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[cdc][mysql]Mysql supports modify column schema changes #3404

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[cdc][mysql]Mysql supports modify column schema changes #3404

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29 changes: 29 additions & 0 deletions ...a/org/apache/flink/cdc/connectors/mysql/source/parser/CustomAlterTableParserListener.java
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Original file line number Diff line number Diff line change
Expand Up @@ -251,6 +251,35 @@ public void exitAlterByRenameColumn(MySqlParser.AlterByRenameColumnContext ctx)
super.exitAlterByRenameColumn(ctx);
}

@Override
public void enterAlterByModifyColumn(MySqlParser.AlterByModifyColumnContext ctx) {
String columnName = parser.parseName(ctx.uid(0));
ColumnEditor columnEditor = Column.editor().name(columnName);
columnEditor.unsetDefaultValueExpression();

columnDefinitionListener =
new CustomColumnDefinitionParserListener(columnEditor, parser, listeners);
listeners.add(columnDefinitionListener);
super.enterAlterByModifyColumn(ctx);
}

@Override
public void exitAlterByModifyColumn(MySqlParser.AlterByModifyColumnContext ctx) {
parser.runIfNotNull(
() -> {
Column column = columnDefinitionListener.getColumn();
if (column != null) {
Map<String, DataType> typeMapping = new HashMap<>();
typeMapping.put(column.name(), fromDbzColumn(column));
changes.add(new AlterColumnTypeEvent(currentTable, typeMapping));
}

listeners.remove(columnDefinitionListener);
},
columnDefinitionListener);
super.exitAlterByModifyColumn(ctx);
}

private org.apache.flink.cdc.common.schema.Column toCdcColumn(Column dbzColumn) {
return org.apache.flink.cdc.common.schema.Column.physicalColumn(
dbzColumn.name(), fromDbzColumn(dbzColumn), dbzColumn.comment());
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