[jira] [Commented] (SPARK-12741) DataFrame count method return wrong size.

["Yu Gan (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-12741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172226#comment-17172226 ] 

Yu Gan commented on SPARK-12741:
--------------------------------

Aha, I came across the similar issue. My sql is 

    select
        p_brand,
        p_size,
        count(ps_suppkey) as supplier_cnt 
    from
        tpch.partsupp 
    inner join
        tpch.part 
            on p_partkey = ps_partkey 
    group by
        P_BRAND,
        p_size


the total row count are different:

dataSet.count()=1179, dataSet.rdd().count()=1178

 

Finally i found the root cause:

In org.apache.spark.sql.execution.datasources.FailureSafeParser#parse throws BadRecordException, when  in PermissiveMode and corrupted record exists the result row would be None record. In this case, the none record will be filtered. 

 

> DataFrame count method return wrong size.
> -----------------------------------------
>
>                 Key: SPARK-12741
>                 URL: https://issues.apache.org/jira/browse/SPARK-12741
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.5.0
>            Reporter: Sasi
>            Priority: Major
>
> Hi,
> I'm updating my report.
> I'm working with Spark 1.5.2, (used to be 1.5.0), I have a DataFrame and I have 2 method, one for collect data and other for count.
> method doQuery looks like:
> {code}
> dataFrame.collect()
> {code}
> method doQueryCount looks like:
> {code}
> dataFrame.count()
> {code}
> I have few scenarios with few results:
> 1) Non data exists on my NoSQLDatabase results: count 0 and collect() 0
> 2) 3 rows exists results: count 0 and collect 3.
> 3) 5 rows exists results: count 2 and collect 5. 
> I tried to change the count code to the below code, but got the same results as I mentioned above.
> {code}
> dataFrame.sql("select count(*) from tbl").count/collect[0]
> {code}
> Thanks,
> Sasi



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