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https://issues.apache.org/jira/browse/HIVE-3308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bennie Schut updated HIVE-3308:
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Status: Patch Available (was: Open)
> Mixing avro and snappy gives null values
> ----------------------------------------
>
> Key: HIVE-3308
> URL: https://issues.apache.org/jira/browse/HIVE-3308
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.10.0
> Reporter: Bennie Schut
> Attachments: HIVE-3308.patch1.txt, HIVE-3308.patch2.txt
>
>
> On default hive uses LazySimpleSerDe for output.
> When I now enable compression and "select count(*) from avrotable" the output
> is a file with the .avro extension but this then will display null values
> since the file is in reality not an avro file but a file created by
> LazySimpleSerDe using compression so should be a .snappy file.
> This causes any job (exception select * from avrotable is that not truly a
> job) to show null values.
> If you use any serde other then avro you can temporarily fix this by setting
> "set hive.output.file.extension=.snappy" and it will correctly work again but
> this won't work on avro since it overwrites the hive.output.file.extension
> during initializing.
> When you dump the query result into a table with "create table bla as" you
> can rename the .avro file into .snappy and the "select from bla" will also
> magiacally work again.
> Input and Ouput serdes don't always match so when I use avro as an input
> format it should not set the hive.output.file.extension.
> Onces it's set all queries will use it and fail making the connection useless
> to reuse.
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