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Posted to issues@spark.apache.org by "Robin (Jira)" <ji...@apache.org> on 2023/02/04 08:53:00 UTC

[jira] [Created] (SPARK-42346) distinct(count colname) with UNION ALL causes query analyzer bug

Robin created SPARK-42346:
-----------------------------

             Summary: distinct(count colname) with UNION ALL causes query analyzer bug
                 Key: SPARK-42346
                 URL: https://issues.apache.org/jira/browse/SPARK-42346
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.3.1
            Reporter: Robin


If you combine a UNION ALL with a count(distinct colname) you get a query analyzer bug.

 

This behaviour is introduced in 3.3.0.  The bug was not present in 3.2.1.

 

Here is a reprex in PySpark:

{{df_pd = pd.DataFrame([}}
{{    \{'surname': 'a', 'first_name': 'b'}}}
{{])}}
{{df_spark = spark.createDataFrame(df_pd)}}
{{df_spark.createOrReplaceTempView("input_table")}}

{{sql = """}}

{{SELECT }}
{{    (SELECT Count(DISTINCT first_name) FROM   input_table) }}
{{        AS distinct_value_count}}
{{FROM   input_table}}
{{UNION ALL}}
{{SELECT }}
{{    (SELECT Count(DISTINCT surname) FROM   input_table) }}
{{        AS distinct_value_count}}
{{FROM   input_table """}}

{{spark.sql(sql).toPandas()}}

 



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