Madhan Sundararajan Devaki created HIVE-9896:
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Summary: \N un-recognized in AVRO format Hive tables
Key: HIVE-9896
URL: https://issues.apache.org/jira/browse/HIVE-9896
Project: Hive
Issue Type: Bug
Components: Database/Schema, File Formats, Hive
Affects Versions: 0.13.0
Environment: CDH5.2.1, RHEL6.5, Java 7
Reporter: Madhan Sundararajan Devaki
We Sqooped data from many RDBMS into HDFS in text format with options
--null-non-string '\\N' --null-string '\\N'.
When we load these into Hive tables in text format the \N is properly
recognized as NULL and we are able to use SQL clauses such as IS NULL and IS
NOT NULL against columns.
However, when we convert the text files into AVRO (1.7.6) with SNAPPY
compression and try to query using the above SQL clauses, the query does not
return results as expected.
Further, we have to use column_name = '\\N' or column_name <> '\\N' as a
workaround.
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