[SPARK-20586] Add deterministic to ScalaUDF

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.3.0
• Component/s: SQL
• Target Version/s: 2.3.0
• Assignee: Xiao Li
• Reporter: Xiao Li
• Created: 03/May/17 16:53
• Updated: 13/Dec/17 14:12
• Resolved: 26/Jul/17 00:21

Description

https://hive.apache.org/javadocs/r2.0.1/api/org/apache/hadoop/hive/ql/udf/UDFType.html

Like Hive UDFType, we should allow users to add the extra flags for ScalaUDF too. stateful/impliesOrder are not applicable to ScalaUDF. Thus, we only add the following two flags.

• deterministic: Certain optimizations should not be applied if UDF is not deterministic. Deterministic UDF returns same result each time it is invoked with a particular input. This determinism just needs to hold within the context of a query.

Issue Links

• is duplicated by: SPARK-15282 UDF executed twice when filter on new column created by withColumn and the final value may be not correct
• links to: [Github] Pull Request #17848 (gatorsmile)