Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/10418#discussion_r48231012
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -26,6 +26,9 @@ import org.apache.spark.sql.types._
/**
* Given an array or map, returns its size.
*/
+@ExpressionDescription(
+ usage = "_FUNC_(column) - Returns the length of the array or map stored
in the column",
+ extended = "> SELECT _FUNC_(array(\"b\", \"d\", \"c\", \"a\"));\n 4")
--- End diff --
Tried to do it, but realized annotation argument needs to be a constant. A
newline marker `\n` is an issue here. We are unable to call `stripMargin` after
triple quotes. Thus, I called `stripMargin` when building `ExpressionInfo`. Do
you like it?
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