/**
* Constructs a FarragoReentrantSubquery.
*
* @param subq the subquery to evaluate
* @param parentConverter sqlToRelConverter associated with the parent query
* @param isExists whether the subquery is part of an EXISTS expression
* @param isExplain whether the subquery is part of an EXPLAIN PLAN statement
* @param results the resulting evaluated expressions
*/
FarragoReentrantSubquery(
SqlCall subq,
SqlToRelConverter parentConverter,
boolean isExists,
boolean isExplain,
List<RexNode> results) {
super(
FennelRelUtil.getPreparingStmt(parentConverter.getCluster()).getRootStmtContext(),
parentConverter.getRexBuilder(),
results);
FarragoSessionStmtContext rootContext = getRootStmtContext();
if (rootContext != null) {
rootContext.setSaveFirstTxnCsn();
}
if (!isExists) {
assert subq.getKind() == SqlKind.SCALAR_QUERY;
}
this.subq = subq;
this.parentConverter = parentConverter;
this.isExists = isExists;
this.isExplain = isExplain;
}
