Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/19964#discussion_r156671610 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala --- @@ -289,53 +289,61 @@ case class Elt(children: Seq[Expression]) val index = indexExpr.genCode(ctx) val strings = stringExprs.map(_.genCode(ctx)) val indexVal = ctx.freshName("index") + + // -1 means the given index doesn't match indices of strings in split function. + val NOT_MATCHED = -1 + // 0 means the given index matches one of indices of strings in split function. + val MATCHED = 0 + val resultState = ctx.freshName("eltResultState") --- End diff -- this can be a `boolean` instead of a `byte` IMHO
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