cloud-fan commented on a change in pull request #32587:
URL: https://github.com/apache/spark/pull/32587#discussion_r636747397
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File path:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/ExpressionDescription.java
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@@ -42,14 +42,17 @@
* `group()` describes the category that the expression belongs to. The valid
value is
* "agg_funcs", "array_funcs", "datetime_funcs", "json_funcs", "map_funcs" and
"window_funcs".
*
+ * `functionType()` describe the type of the function. The valid value is
"built-in", "hive",
+ * "python_udf", "scala_udf", "java_udf".
Review comment:
function type may sounds like scalar/aggregate/table function etc.
I don't have a good idea now, maybe `source`? cc @HyukjinKwon
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