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[SPARK-8636][SQL] Fix equalNullSafe comparison #7040

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vinodkc wants to merge 3 commits into from
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[SPARK-8636][SQL] Fix equalNullSafe comparison #7040

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f2d0b53
Fix equalNullSafe comparison
Jun 26, 2015
aac9f67
Updated test suite and genCode method
Jun 29, 2015
be5e641
Renamed equalNullSafe to threeValueEquals
Jul 13, 2015
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Fix equalNullSafe comparison
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Vinod K C committed Jun 26, 2015
commit f2d0b53ebd0930f30f05fda2b00c9c0e835b3b79
4 changes: 1 addition & 3 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionals.scala
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Expand Up @@ -296,9 +296,7 @@ case class CaseKeyWhen(key: Expression, branches: Seq[Expression]) extends CaseW
}

private def equalNullSafe(l: Any, r: Any) = {
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@marmbrus marmbrus Jul 8, 2015

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We should at least consider renaming this function. Null safe equals in sql typically returns true for null <=> null

http://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html#operator_equal-to

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@vinodkc vinodkc Jul 10, 2015

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@marmbrus
Shall I rename the function private def equalNullSafe(l: Any, r: Any)
to private def equal(l: Any, r: Any) ?

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@marmbrus marmbrus Jul 10, 2015

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or threeValueEquals ?

if (l == null && r == null) {
true
} else if (l == null || r == null) {
if (l == null || r == null) {
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@dragos dragos Jun 30, 2015

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This is far enough from Java/Scala semantics that it warrants a scaladoc and a pointer to NULL semantics in SQL, IMO

false
} else {
l == r
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