Github user aray commented on a diff in the pull request:
https://github.com/apache/spark/pull/17226#discussion_r105324124
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -522,7 +522,7 @@ class Analyzer(
} else {
val pivotAggregates: Seq[NamedExpression] = pivotValues.flatMap
{ value =>
def ifExpr(expr: Expression) = {
- If(EqualTo(pivotColumn, value), expr, Literal(null))
+ If(EqualNullSafe(pivotColumn, value), expr, Literal(null))
--- End diff --
We need to use null safe equality regardless of aggregate as this is for
comparison to each of the pivot values (one of which may be a null).
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