Bennie Schut created HIVE-3308:
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Summary: 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
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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