Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/11815#discussion_r56618261 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala --- @@ -202,3 +203,14 @@ object Unions { } } } + +/** + * Extractor for retrieving Int value. + */ +object IntegerIndex { + def unapply(a: Any): Option[Int] = a match { + case Literal(a: Int, IntegerType) => Some(a) + case UnaryMinus(IntegerLiteral(v)) => Some(-v) --- End diff -- i still don't get it - why are we matching unary minus ?
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