@Override
    public void onMatch(RelOptRuleCall call) {
      final HiveJdbcConverter conv = call.rel(2);
      super.onMatch(call, conv.getJdbcDialect());
    }
JDBCSplitFilterAboveJoinRule split splitter above a HiveJoin operator, so we could push it into the HiveJoin.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/jdbc/JDBCAbstractSplitFilterRule.java