Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13966#discussion_r69057266
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -162,6 +163,46 @@ case class ConcatWs(children: Seq[Expression])
}
}
+@ExpressionDescription(
+ usage = "_FUNC_(n, str1, str2, ...) - returns the n-th string",
+ extended = "> SELECT _FUNC_(1, 'scala', 'java') FROM src LIMIT 1;\n" +
"'scala'")
+case class Elt(children: Seq[Expression])
+ extends Expression with ImplicitCastInputTypes with CodegenFallback {
--- End diff --
please open a new JIRA to add codegen for this expression. Then we won't
forget about it.
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