ilicmarkodb commented on code in PR #54284:
URL: https://github.com/apache/spark/pull/54284#discussion_r2804530332
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCoercion.scala:
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@@ -479,6 +484,30 @@ object CollationTypeCoercion extends SQLConfHelper {
_: StringSplitSQL | _: In | _: InSubquery | _: FindInSet => false
case _ => true
}
+
+ /**
+ * Pre-tags [[CommonExpressionRef]]s in [[With]] expressions with the
collation context of their
+ * definitions. This must be called before the bottom-up expression
transformation, because that
+ * transformation processes inner expressions (like [[EqualTo]]) before
reaching the [[With]]
+ * node. Without the enclosing [[With]], we have no context for what the
refs point to, so we
+ * cannot correctly determine their collation strength.
+ */
+ private[analysis] def preTagCommonExpressionRefs(plan: LogicalPlan):
LogicalPlan = {
+ plan.resolveExpressionsDown {
+ case withExpression: With =>
+ withExpression.child.foreach {
+ case ref: CommonExpressionRef =>
+ withExpression.defs.find(d => d.id == ref.id && d.child.resolved)
+ .foreach { definition =>
+ findCollationContext(definition.child).foreach { context =>
+ ref.setTagValue(COLLATION_CONTEXT_TAG, context)
+ }
+ }
+ case _ =>
+ }
+ withExpression
+ }
+ }
Review Comment:
`NULLIF(left, right)` transforms to `With(left) { ref => If(EqualTo(ref,
right), Literal.create(null, left.dataType), ref) }`
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