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https://issues.apache.org/jira/browse/SPARK-34042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17265022#comment-17265022
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Marius Butan commented on SPARK-34042:
--------------------------------------
Like I said in description I made some tests in
[https://github.com/butzy92/spark-column-mapping-issue/blob/master/src/test/java/spark/test/SparkTest.java]:
All the tests are running on a file with 3 columns
withPruningEnabledAndMapSingleColumn -> with pruning enabled when we have a
column in schema and we use it for the select query, the expected result is 2
not 0
withPruningEnabledAndMap2ColumnsButUse1InSql-> with pruning enabled when we
have 2 columns in schema and we use only 1 in the select, the expected result
is 2 and it is correct
withPruningDisableAndMap2ColumnsButUse1InSql -> with pruning disabled it works
correctly
> Column pruning is not working as expected for PERMISIVE mode
> ------------------------------------------------------------
>
> Key: SPARK-34042
> URL: https://issues.apache.org/jira/browse/SPARK-34042
> Project: Spark
> Issue Type: Bug
> Components: Java API
> Affects Versions: 2.4.7
> Reporter: Marius Butan
> Priority: Major
>
> In PERMISSIVE mode
> Given a csv with multiple columns per row, if your file schema has a single
> column and you are doing a SELECT in SQL with a condition like
> '<corrupt_record_column_name> is null', the row is marked as corrupted
>
> BUT if you add an extra column in the file schema and you are not putting
> that column in SQL SELECT , the row is not marked as corrupted
>
> PS. I don't know exactly what is the right behavior, I didn't find it for
> PERMISSIVE mode the documentation.
> What I found is: As an example, CSV file contains the "id,name" header and
> one row "1234". In Spark 2.4, the selection of the id column consists of a
> row with one column value 1234 but in Spark 2.3 and earlier, it is empty in
> the DROPMALFORMED mode. To restore the previous behavior, set
> {{spark.sql.csv.parser.columnPruning.enabled}} to {{false}}.
>
> [https://spark.apache.org/docs/2.4.0/sql-migration-guide-upgrade.html]
>
> I made a "unit" test in order to exemplify the issue:
> [https://github.com/butzy92/spark-column-mapping-issue/blob/master/src/test/java/spark/test/SparkTest.java]
>
>
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