[jira] [Closed] (SPARK-17728) UDFs are run too many times

["Herman van Hovell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-17728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Herman van Hovell closed SPARK-17728.
-------------------------------------
    Resolution: Not A Problem

> UDFs are run too many times
> ---------------------------
>
>                 Key: SPARK-17728
>                 URL: https://issues.apache.org/jira/browse/SPARK-17728
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.0.0
>         Environment: Databricks Cloud / Spark 2.0.0
>            Reporter: Jacob Eisinger
>            Priority: Minor
>         Attachments: over_optimized_udf.html
>
>
> h3. Background
> Llonger running processes that might run analytics or contact external services from UDFs. The response might not just be a field, but instead a structure of information. When attempting to break out this information, it is critical that query is optimized correctly.
> h3. Steps to Reproduce
> # Create some sample data.
> # Create a UDF that returns a multiple attributes.
> # Run UDF over some data.
> # Create new columns from the multiple attributes.
> # Observe run time.
> h3. Actual Results
> The UDF is executed *multiple times* _per row._
> h3. Expected Results
> The UDF should only be executed *once* _per row._
> h3. Workaround
> Cache the Dataset after UDF execution.
> h3. Details
> For code and more details, see [^over_optimized_udf.html]



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