Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/8353#discussion_r37658342
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -114,8 +114,41 @@ case class ConcatWs(children: Seq[Expression])
boolean ${ev.isNull} = ${ev.primitive} == null;
"""
} else {
- // Contains a mix of strings and array<string>s. Fall back to
interpreted mode for now.
- super.genCode(ctx, ev)
+ val list = ctx.freshName("list")
+ val array = ctx.freshName("array")
+
+ val sep = children.head.gen(ctx)
+ val vararg = children.tail.map { child =>
+ val eval = child.gen(ctx)
+ child.dataType match {
+ case StringType =>
+ s"""
+ ${eval.code}
+ $list.add(${eval.isNull} ? (UTF8String) null :
${eval.primitive});
+ """
+ case _: ArrayType =>
+ val size = ctx.freshName("n")
+ val j = ctx.freshName("j")
+ s"""
+ ${eval.code}
+ if (!${eval.isNull}) {
+ final int $size = ${eval.primitive}.numElements();
+ for (int $j = 0; $j < $size; $j ++) {
--- End diff --
Minor: `j` is only available in loop scope, so we don't need to create a
unique name for it.
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