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[SPARK-20315] [SQL] Set ScalaUDF's deterministic to true #17626

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[SPARK-20315] [SQL] Set ScalaUDF's deterministic to true #17626

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39abf22
fix.
gatorsmile Apr 13, 2017
4e59b67
correct it
gatorsmile Apr 13, 2017
03303a9
revert
gatorsmile Apr 13, 2017
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3 changes: 3 additions & 0 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ScalaUDF.scala
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Expand Up @@ -45,6 +45,9 @@ case class ScalaUDF(
udfName: Option[String] = None)
extends Expression with ImplicitCastInputTypes with NonSQLExpression {

// the user-defined functions must be deterministic.
final override def deterministic: Boolean = true
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Oh, although we decided that this must be true, but should we override this explicitly? Is this for allowing further optimizations like predicate pushdown?


override def nullable: Boolean = true

override def toString: String =
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