public Map<TableId, TableChanges.TableChange> getTableSchemas() {
        return tableSchemas;
    }
Indicates there is no more splits available in this assigner.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/assigners/MySqlSnapshotSplitAssigner.java