wangyum commented on a change in pull request #27252: [SPARK-29231][SQL]
Constraints should be inferred from cast equality constraint
URL: https://github.com/apache/spark/pull/27252#discussion_r368788944
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala
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@@ -75,8 +86,10 @@ trait ConstraintHelper {
private def replaceConstraints(
constraints: Set[Expression],
source: Expression,
- destination: Attribute): Set[Expression] = constraints.map(_ transform {
+ destination: Expression): Set[Expression] = constraints.map(_ transform {
case e: Expression if e.semanticEquals(source) => destination
+ }).map(_ transform {
+ case Cast(e @ Cast(child, _, _), dt, _) if e == destination && dt ==
child.dataType => child
Review comment:
To revert these changes `(cast(cast(int_column#2 as bigint) as int) = 2)` to
`(int_column#2 = 2)`.
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