Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16719#discussion_r98346066
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSetSuite.scala
---
@@ -32,6 +32,38 @@ class ExpressionSetSuite extends SparkFunSuite {
val aAndBSet = AttributeSet(aUpper :: bUpper :: Nil)
+ // An [AttributeReference] with almost the maximum hashcode, to make
testing canonicalize rules
+ // like `case GreaterThan(l, r) if l.hashcode > r.hashcode =>
GreaterThan(r, l)` easier
+ val maxHash =
+ Canonicalize.ignoreNamesTypes(
+ AttributeReference("maxHash", IntegerType)(exprId =
+ new ExprId(4, NamedExpression.jvmId) {
+ // maxHash's hashcode is calculated based on this exprId's
hashcode, so we set this
+ // exprId's hashCode to this specific value to make sure
maxHash's hashcode is almost
+ // `Int.MaxValue`
+ override def hashCode: Int = 826929706
+ // We are implementing this equals() only because the
style-checking rule "you should
+ // implement equals and hashCode together" requires us to
+ override def equals(obj: Any): Boolean = super.equals(obj)
+ })).asInstanceOf[AttributeReference]
+ assert(maxHash.hashCode() == Int.MaxValue - 1)
+
+ // An [AttributeReference] with almost the minimum hashcode, to make
testing canonicalize rules
+ // like `case GreaterThan(l, r) if l.hashcode > r.hashcode =>
GreaterThan(r, l)` easier
+ val minHash =
+ Canonicalize.ignoreNamesTypes(
+ AttributeReference("minHash", IntegerType)(exprId =
+ new ExprId(5, NamedExpression.jvmId) {
+ // minHash's hashcode is calculated based on this exprId's
hashcode, so we set this
+ // exprId's hashCode to this specific value to make sure
minHash's hashcode is almost
+ // `Int.MinValue`
+ override def hashCode: Int = 826929707
--- End diff --
Why not `override def hashCode: Int = Int.MinValue`?
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