shahidki31 commented on a change in pull request #32494:
URL: https://github.com/apache/spark/pull/32494#discussion_r631528270
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/UnionEstimation.scala
##########
@@ -111,6 +111,44 @@ object UnionEstimation {
AttributeMap.empty[ColumnStat]
}
+ val attrToComputeNullCount =
union.children.map(_.output).transpose.zipWithIndex.filter {
+ case (attrs, _) => attrs.zipWithIndex.forall {
+ case (attr, childIndex) =>
+ val attrStats = union.children(childIndex).stats.attributeStats
+ attrStats.get(attr).isDefined && attrStats(attr).nullCount.isDefined
+ }
+ }
+
+ val newAttrStats = if (attrToComputeNullCount.nonEmpty) {
+ val outputAttrStats = new ArrayBuffer[(Attribute, ColumnStat)]()
+ attrToComputeNullCount.foreach {
+ case (attrs, outputIndex) =>
+ val colWithNullStatValues =
attrs.zipWithIndex.foldLeft[Option[BigInt]](None) {
+ case (totalNullCount, (attr, childIndex)) =>
+ val colStat =
union.children(childIndex).stats.attributeStats(attr)
+ if (totalNullCount.isDefined) {
Review comment:
Yes, initial value of `totalNullCount` is None.
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/statsEstimation/UnionEstimationSuite.scala
##########
@@ -188,7 +188,58 @@ class UnionEstimationSuite extends StatsEstimationTestBase
{
val union = Union(Seq(child1, child2))
- val expectedStats = logical.Statistics(sizeInBytes = 2 * 1024, rowCount =
Some(4))
+ // Only null count is present in the attribute stats
+ val expectedStats = logical.Statistics(
+ sizeInBytes = 2 * 1024,
+ rowCount = Some(4),
+ attributeStats = AttributeMap(
+ Seq(attrInt -> ColumnStat(nullCount = Some(0)))))
+ assert(union.stats === expectedStats)
+ }
+
+ test("col stats estimation when null count stats are not present for one
child") {
+ val sz = Some(BigInt(1024))
+ val attrInt = AttributeReference("cint", IntegerType)()
+ val columnInfo = AttributeMap(
+ Seq(
+ attrInt -> ColumnStat(
+ distinctCount = Some(2),
+ min = Some(1),
+ max = Some(2),
+ nullCount = Some(2),
+ avgLen = Some(4),
+ maxLen = Some(4))))
+
+ // No null count
+ val columnInfo1 = AttributeMap(
+ Seq(
+ AttributeReference("cint1", IntegerType)() -> ColumnStat(
+ distinctCount = Some(2),
+ min = Some(3),
+ max = Some(4),
+ avgLen = Some(8),
+ maxLen = Some(8))))
+
+ val child1 = StatsTestPlan(
+ outputList = columnInfo.keys.toSeq,
+ rowCount = 2,
+ attributeStats = columnInfo,
+ size = sz)
+
+ val child2 = StatsTestPlan(
+ outputList = columnInfo1.keys.toSeq,
+ rowCount = 2,
+ attributeStats = columnInfo1,
+ size = sz)
+
+ val union = Union(Seq(child1, child2))
+
+ // Null count should not present in the stats
+ val expectedStats = logical.Statistics(
+ sizeInBytes = 2 * 1024,
+ rowCount = Some(4),
+ attributeStats = AttributeMap(
+ Seq(attrInt -> ColumnStat(min = Some(1), max = Some(4), nullCount =
None))))
Review comment:
Fixed
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