// because it has no recognized partitioning join key.
List<SchemaColumn> columnsNeedingCoverage = tableScan.getPartitioningColumns();
if (tableScan instanceof StmtSubqueryScan) {
StmtSubqueryScan subScan = (StmtSubqueryScan) tableScan;
subScan.promoteSinglePartitionInfo(valueEquivalence, eqSets);
if (subScan.hasReceiveNode()) {
if (subqueryHasReceiveNode) {
// Has found another subquery with receive node on the same level
// Not going to support this kind of subquery join with 2 fragment plan.