Eric Yang created SPARK-58095:
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Summary: 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
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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