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https://issues.apache.org/jira/browse/SQOOP-1369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524041#comment-14524041
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Yibing Shi commented on SQOOP-1369:
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+1 for the first method, not only it is the simplest, but also it helps solve
this problem with Parquet export. The other 2 can't help Parquet export.
Looking forward to your patch!
> Avro export ignores --columns option
> ------------------------------------
>
> Key: SQOOP-1369
> URL: https://issues.apache.org/jira/browse/SQOOP-1369
> Project: Sqoop
> Issue Type: Bug
> Reporter: Lars Francke
>
> In JdbcExportJob AVRO_COLUMN_TYPES_MAP is being set with the full schema of
> the output table. This causes the AvroExportMapper to fail with unknown
> fields if --columns was used to restrict the columns to export (it then tries
> to set a value on the generated class which doesn't exist).
> There are multiple ways I can see to solve this.
> * Filter the columnTypes passed on to the Mapper in
> JdbcExportJob.configureInputFormat
> * Pass the --columns value on to the AvroExportMapper and let it ignore
> things that are not in there
> * Let AvroExportMapper not fail when it can't set a field.
> I might be able to provide a patch and I'd go with the simplest (the first
> one probably) if there are no objections.
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