[GitHub] [spark] cloud-fan commented on a change in pull request #27252: [SPARK-29231][SQL] Constraints should be inferred from cast equality constraint

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cloud-fan 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_r377117538
 
 

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 File path: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/InferFiltersFromConstraintsSuite.scala
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 @@ -263,4 +264,34 @@ class InferFiltersFromConstraintsSuite extends PlanTest {
     val y = testRelation.subquery('y)
     testConstraintsAfterJoin(x, y, x.where(IsNotNull('a)), y, RightOuter)
   }
+
+  test("Constraints should be inferred from cast equality constraint(filter higher data type)") {
+    val testRelation1 = LocalRelation('a.int)
+    val testRelation2 = LocalRelation('b.long)
+    val originalLeft = testRelation1.subquery('left)
+    val originalRight = testRelation2.where('b === 1L).subquery('right)
+
+    val left = testRelation1.where(IsNotNull('a) && 'a.cast(LongType) === 1L).subquery('left)
+    val right = testRelation2.where(IsNotNull('b) && 'b === 1L).subquery('right)
+
+    Seq(Some("left.a".attr.cast(LongType) === "right.b".attr),
+      Some("right.b".attr === "left.a".attr.cast(LongType))).foreach { condition =>
+      testConstraintsAfterJoin(originalLeft, originalRight, left, right, Inner, condition)
+    }
+  }
+
+  test("Constraints shouldn't be inferred from cast equality constraint(filter lower data type)") {
+    val testRelation1 = LocalRelation('a.int)
+    val testRelation2 = LocalRelation('b.long)
 
 Review comment:
   can we also test that we cast long to int and compare?

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