Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/11815#discussion_r56619383 --- 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 -- As shown in the following link, our parser convert `-3` to UnaryMinus(IntegerLiteral(3)). Thus, we have to use this to get negative values. https://github.com/apache/spark/blob/637a78f1d3dff00658324de3887d75c5ccd857be/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/CatalystQl.scala#L641
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