Christopher Bryant created SPARK-35480:
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Summary: percentile_approx function doesn't work with pivot
Key: SPARK-35480
URL: https://issues.apache.org/jira/browse/SPARK-35480
Project: Spark
Issue Type: Bug
Components: PySpark, SQL
Affects Versions: 3.1.1
Reporter: Christopher Bryant
The percentile_approx PySpark function does not appear to treat the "accuracy"
parameter correctly when pivoting on a column, causing the query below to fail
(this also fails if the accuracy parameter is left unspecified):
----
{{{{import pyspark.sql.functions as F}}}}
{{df = sc.parallelize([}}
{{ ["a", -1.0],}}
{{ ["a", 5.5],}}
{{ ["a", 2.5],}}
{{ ["b", 3.0],}}
{{ ["b", 5]}}
{{]).toDF(["type", "value"]) \}}
{{ .groupBy() \}}
{{ .pivot("type", ["a", "b"]) \}}
{{ .agg(F.percentile_approx("value", [0.5], 10000).alias("percentiles"))}}
----
Error message:
{{AnalysisException: cannot resolve 'percentile_approx((IF((`type` <=> CAST('a'
AS STRING)), `value`, CAST(NULL AS DOUBLE))), (IF((`type` <=> CAST('a' AS
STRING)), array(0.5D), NULL)), (IF((`type` <=> CAST('a' AS STRING)), 10000,
CAST(NULL AS INT))))' due to data type mismatch: The accuracy or percentage
provided must be a constant literal; 'Aggregate [percentile_approx(if
((type#242 <=> cast(a as string))) value#243 else cast(null as double), if
((type#242 <=> cast(a as string))) array(0.5) else cast(null as array<double>),
if ((type#242 <=> cast(a as string))) 10000 else cast(null as int), 0, 0) AS
a#251, percentile_approx(if ((type#242 <=> cast(b as string))) value#243 else
cast(null as double), if ((type#242 <=> cast(b as string))) array(0.5) else
cast(null as array<double>), if ((type#242 <=> cast(b as string))) 10000 else
cast(null as int), 0, 0) AS b#253] +- LogicalRDD [type#242, value#243], false}}
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