[GitHub] [spark] cloud-fan commented on a change in pull request #27759: [SPARK-31008][SQL]Support json_array_length function

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cloud-fan commented on a change in pull request #27759: [SPARK-31008][SQL]Support json_array_length function
URL: https://github.com/apache/spark/pull/27759#discussion_r390259376
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
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 @@ -781,3 +782,68 @@ case class SchemaOfJson(
 
   override def prettyName: String = "schema_of_json"
 }
+
+/**
+ * A function that returns the number of elements in outer JSON Array.
+ */
+@ExpressionDescription(
+  usage = "_FUNC_(jsonArray) - Returns the number of elements in outer JSON Array.",
+  arguments = """
+    Arguments:
+      * jsonArray - A JSON array is required as argument. An Exception is thrown if any
+          other valid JSON strings are passed. `NULL` is returned in case of invalid JSON.
 
 Review comment:
   if any other valid JSON strings are passed, we should return null as well?

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