PHILO-HE commented on code in PR #5862:
URL: https://github.com/apache/incubator-gluten/pull/5862#discussion_r1615732081
##########
gluten-core/src/main/scala/org/apache/gluten/expression/ScalarSubqueryTransformer.scala:
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@@ -30,21 +31,7 @@ case class ScalarSubqueryTransformer(substraitExprName:
String, query: ScalarSub
if (TransformerState.underValidationState) {
return ExpressionBuilder.makeLiteral(null, query.dataType, true)
}
- // the first column in first row from `query`.
- val rows = query.plan.executeCollect()
- if (rows.length > 1) {
- throw new IllegalStateException(
- s"more than one row returned by a subquery used as an
expression:\n${query.plan}")
- }
- val result: AnyRef = if (rows.length == 1) {
- assert(
- rows(0).numFields == 1,
- s"Expects 1 field, but got ${rows(0).numFields}; something went wrong
in analysis")
- rows(0).get(0, query.dataType)
- } else {
- // If there is no rows returned, the result should be null.
- null
- }
+ val result = query.eval(InternalRow.empty)
Review Comment:
@ulysses-you, it would be nice to add these comment in the code.
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