Vineet Garg created HIVE-18857:
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Summary: Store default value text instead of default value
expression in metastore
Key: HIVE-18857
URL: https://issues.apache.org/jira/browse/HIVE-18857
Project: Hive
Issue Type: Improvement
Components: SQL
Reporter: Vineet Garg
Assignee: Vineet Garg
Currently for default value an expression is generated and serialized to store
in metastore. It should be improved to rather serialize the default value
itself instead of expression and store that in metastore. This will have the
following benefits:
* It will make metastore schema upgrade safe. e.g. if a UDF function name is
changed hive wouldn't be able to parse back the expression for this UDF which
was serialized in earlier version.
* It will make metastore schema for default constraint hive agnostic. Other
databases would be able to use the value as it is.
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