Function _handoff_eager

src/execution_plan/ops/op_call_subquery.c:153–167

passes a record to the parent op. if the subquery is non-returning, yield input record(s) otherwise, yields a record produced by the subquery

// if the subquery is non-returning, yield input record(s)
// otherwise, yields a record produced by the subquery
static Record _handoff_eager
(
	OpCallSubquery *op  // CallSubquery operation
) {
	ASSERT(op->is_returning || op->records != NULL);

	if(!op->is_returning) {
		// if there is a record to return from the input records, return it
		// NOTICE: The order of records reverses here.
		return array_len(op->records) > 0 ? array_pop(op->records) : NULL;
	}

	// returning subquery
	return OpBase_Consume(op->body);
}

// eagerly consume and aggregate all the records from the lhs (if exists). pass
// the aggregated record-list to the ArgumentList operation(s)