Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17226#discussion_r105322090
--- 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 --
Up to my understanding, this returns an `expr` for the aggregate functions
ignoring `null`s. That was why I used a null-safe equality comparison for
`Count`. We have now only single exception, `Count`.
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