Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19728#discussion_r151478304
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -63,15 +63,32 @@ case class Concat(children: Seq[Expression]) extends
Expression with ImplicitCas
override protected def doGenCode(ctx: CodegenContext, ev: ExprCode):
ExprCode = {
val evals = children.map(_.genCode(ctx))
- val inputs = evals.map { eval =>
- s"${eval.isNull} ? null : ${eval.value}"
- }.mkString(", ")
- ev.copy(evals.map(_.code).mkString("\n") + s"""
- boolean ${ev.isNull} = false;
- UTF8String ${ev.value} = UTF8String.concat($inputs);
- if (${ev.value} == null) {
- ${ev.isNull} = true;
+ val argNums = evals.length
--- End diff --
nit: `numArgs`.
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