Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19728#discussion_r151740628
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -125,19 +138,43 @@ case class ConcatWs(children: Seq[Expression])
if (children.forall(_.dataType == StringType)) {
// All children are strings. In that case we can construct a fixed
size array.
val evals = children.map(_.genCode(ctx))
-
- val inputs = evals.map { eval =>
- s"${eval.isNull} ? (UTF8String) null : ${eval.value}"
- }.mkString(", ")
-
- ev.copy(evals.map(_.code).mkString("\n") + s"""
- UTF8String ${ev.value} = UTF8String.concatWs($inputs);
+ val separator = evals.head
+ val strings = evals.tail
+ val argNums = strings.length
--- End diff --
nit: `numArgs`
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