[jira] [Updated] (SPARK-58095) approx_top_k_combine fails the query with an internal error (MatchError) on empty input

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-58095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated SPARK-58095:
-----------------------------------
    Labels: pull-request-available  (was: )

> approx_top_k_combine fails the query with an internal error (MatchError) on empty input
> ---------------------------------------------------------------------------------------
>
>                 Key: SPARK-58095
>                 URL: https://issues.apache.org/jira/browse/SPARK-58095
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 5.0.0
>            Reporter: Eric Yang
>            Priority: Major
>              Labels: pull-request-available
>
> When `approx_top_k_combine` aggregates over zero input rows -- an empty input, or one fully removed by a filter -- the whole query fails with an internal error (scala.MatchError: null) instead of returning an empty result. This surfaces to the user as a SparkException / aborted job.
> *Repro*:
> {code:sql}
> SELECT approx_top_k_combine(sketch, 5)
> FROM (SELECT approx_top_k_accumulate(expr) AS sketch FROM VALUES (1), (2) AS t(expr))
> WHERE false;
> -- org.apache.spark.SparkException: Job aborted due to stage failure:
> --   ... scala.MatchError: null
> {code}
> The other approx_top_k functions (approx_top_k, approx_top_k_accumulate, approx_top_k_estimate) are not affected -- only approx_top_k_combine. 



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