@Override
    public Long queryApproximateRowCnt(JdbcConnection jdbc, TableId tableId) throws SQLException {
        return PgQueryUtils.queryApproximateRowCnt(jdbc, tableId);
    }
The splitter to split the table into chunks using primary-key (by default) or a given split key.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/cdc/postgres/source/PostgresChunkSplitter.java