Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19064#discussion_r135446631
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ScalaUDF.scala
---
@@ -22,6 +22,9 @@ import
org.apache.spark.sql.catalyst.{CatalystTypeConverters, InternalRow}
import org.apache.spark.sql.catalyst.expressions.codegen._
import org.apache.spark.sql.types.DataType
+// Trait for identifying user-defined functions.
--- End diff --
```Scala
/**
* Common base trait for user-defined functions, including ScalaUDF,
ScalaUDAF, PythonUDF,
* HiveSimpleUDF, HiveGenericUDF, and HiveUDAFFunction.
*/
```
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