viirya commented on a change in pull request #27008: [SPARK-30353][SQL] Use
constraints in SimplifyBinaryComparison optimization
URL: https://github.com/apache/spark/pull/27008#discussion_r361517997
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -384,22 +384,49 @@ object BooleanSimplification extends Rule[LogicalPlan]
with PredicateHelper {
/**
* Simplifies binary comparisons with semantically-equal expressions:
* 1) Replace '<=>' with 'true' literal.
- * 2) Replace '=', '<=', and '>=' with 'true' literal if both operands are
non-nullable.
- * 3) Replace '<' and '>' with 'false' literal if both operands are
non-nullable.
+ * 2) Replace '=', '<=', and '>=' with 'true' literal
+ * if both operands are non-nullable or in constraints.
+ * 3) Replace '<' and '>' with 'false' literal if both operands are
non-nullable or in constraints.
*/
-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 = {
+ def canSimplify(left: Expression, right: Expression): Boolean = {
Review comment:
canSimplify is not reuse. We can just inline it.
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