Xiao Li created SPARK-20586: ------------------------------- Summary: Add deterministic and distinctLike to ScalaUDF Key: SPARK-20586 URL: https://issues.apache.org/jira/browse/SPARK-20586 Project: Spark Issue Type: Bug Components: SQL Affects Versions: 2.2.0 Reporter: Xiao Li Assignee: Xiao Li
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. - distinctLike: A UDF is considered distinctLike if the UDF can be evaluated on just the distinct values of a column. Examples include min and max UDFs. This information is used by metadata-only optimizer. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org