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[SPARK-33119][SQL] ScalarSubquery should returns the first two rows to avoid Driver OOM #30016

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[SPARK-33119][SQL] ScalarSubquery should returns the first two rows to avoid Driver OOM #30016

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3 changes: 2 additions & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/execution/subquery.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,8 @@ case class ScalarSubquery(
@volatile private var updated: Boolean = false

def updateResult(): Unit = {
val rows = plan.executeCollect()
// Only return the first two rows as an array to avoid Driver OOM.
val rows = plan.executeTake(2)
if (rows.length > 1) {
sys.error(s"more than one row returned by a subquery used as an expression:\n$plan")
}
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