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[SPARK-49808][SQL] Fix a deadlock in subquery execution due to lazy vals #48279

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[SPARK-49808][SQL] Fix a deadlock in subquery execution due to lazy vals #48279

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7 changes: 5 additions & 2 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ import org.apache.spark.sql.catalyst.trees.TreePatternBits
import org.apache.spark.sql.catalyst.types.DataTypeUtils
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types.{DataType, StructType}
import org.apache.spark.util.LazyTry
import org.apache.spark.util.collection.BitSet

/**
Expand Down Expand Up @@ -94,9 +95,11 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]]
* All Attributes that appear in expressions from this operator. Note that this set does not
* include attributes that are implicitly referenced by being passed through to the output tuple.
*/
def references: AttributeSet = lazyReferences.get

@transient
lazy val references: AttributeSet = {
AttributeSet.fromAttributeSets(expressions.map(_.references)) -- producedAttributes
private val lazyReferences = LazyTry {
AttributeSet(expressions) -- producedAttributes
}

/**
Expand Down