[jira] [Updated] (HIVE-3308) Mixing avro and snappy gives null values

["Bennie Schut (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-3308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bennie Schut updated HIVE-3308:
-------------------------------

    Attachment: HIVE-3308.patch1.txt

Added a test to show the problem.
Result of the test will show:

#### A masked pattern was here ####
POSTHOOK: query: select count(*) from src
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
NULL

But should show something like:

#### A masked pattern was here ####
POSTHOOK: query: select count(*) from src
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
500

                
> 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
>
>
> 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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