public PostgresSourceBuilder<T> fetchSize(int fetchSize) {
        this.configFactory.fetchSize(fetchSize);
        return this;
    }
The maximum fetch size for per poll when read table snapshot.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/cdc/postgres/source/PostgresSourceBuilder.java