Vineet Garg updated HIVE-18857:
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

Pushed to both master and branch-3

> 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
>            Priority: Major
>             Fix For: 3.0.0
>         Attachments: HIVE-18857.1.patch, HIVE-18857.2.patch, 
> HIVE-18857.3.patch
> 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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