ulysses-you commented on a change in pull request #27008: [SPARK-30353][SQL]
Add IsNotNull check in SimplifyBinaryComparison optimization
URL: https://github.com/apache/spark/pull/27008#discussion_r365032721
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -387,19 +387,36 @@ object BooleanSimplification extends Rule[LogicalPlan]
with PredicateHelper {
* 2) Replace '=', '<=', and '>=' with 'true' literal if both operands are
non-nullable.
* 3) Replace '<' and '>' with 'false' literal if both operands are
non-nullable.
*/
-object SimplifyBinaryComparison extends Rule[LogicalPlan] with PredicateHelper
{
+object SimplifyBinaryComparison
+ extends Rule[LogicalPlan] with PredicateHelper with ConstraintHelper {
+
+ private def canSimplifyComparison(
+ plan: LogicalPlan, left: Expression, right: Expression): Boolean = {
+ if (!left.nullable && !right.nullable && left.semanticEquals(right)) {
+ true
+ } else {
+ // We do more checks for non-nullable cases
+ plan match {
+ case Filter(fc, _) =>
+ splitConjunctivePredicates(fc).exists { condition =>
+ condition.semanticEquals(IsNotNull(left)) &&
condition.semanticEquals(IsNotNull(right))
Review comment:
In this scene, left is semanticEquals to right. Like this `where c > c`, and
if there exists `IsNotNull(c)`, then will return true.
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