↓ 3 callersMethodgetChunkKeyColumnType(
Table table, Map<ObjectPath, String> chunkKeyColumns, boolean tinyInt1isBit)
flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/main/java/org/apache/flink/cdc/connectors/mysql/source/utils/ChunkUtils.java:47