iRakson 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_r403478544
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
##########
@@ -796,3 +796,75 @@ 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. An exception is thrown if any other valid
JSON strings are passed.
+ `NULL` is returned in case of an invalid JSON.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_('[1,2,3,4]');
+ 4
+ > SELECT _FUNC_('[1,2,3,{"f1":1,"f2":[5,6]},4]');
+ 5
+ > SELECT _FUNC_('[1,2');
+ NULL
+ """,
+ since = "3.1.0"
+)
+case class LengthOfJsonArray(child: Expression) extends UnaryExpression
+ with CodegenFallback with ExpectsInputTypes {
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(StringType)
Review comment:
`AbstractDataType` -> `DataType`
I will fix this while handling review comments, if any.
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