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From "Miklos Gergely (JIRA)" <>
Subject [jira] [Updated] (HIVE-21725) Break up DDLTask - extract Column and Constraint related operations
Date Wed, 15 May 2019 05:04:00 GMT


Miklos Gergely updated HIVE-21725:
    Attachment: HIVE-21725.05.patch

> Break up DDLTask - extract Column and Constraint related operations
> -------------------------------------------------------------------
>                 Key: HIVE-21725
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Hive
>    Affects Versions: 3.1.1
>            Reporter: Miklos Gergely
>            Assignee: Miklos Gergely
>            Priority: Major
>              Labels: refactor-ddl
>             Fix For: 4.0.0
>         Attachments: HIVE-21725.01.patch, HIVE-21725.02.patch, HIVE-21725.03.patch, HIVE-21725.04.patch,
> DDLTask is a huge class, more than 5000 lines long. The related DDLWork is also a huge
class, which has a field for each DDL operation it supports. The goal is to refactor these
in order to have everything cut into more handleable classes under the package  org.apache.hadoop.hive.ql.exec.ddl:
>  * have a separate class for each operation
>  * have a package for each operation group (database ddl, table ddl, etc), so the amount
of classes under a package is more manageable
>  * make all the requests (DDLDesc subclasses) immutable
>  * DDLTask should be agnostic to the actual operations
>  * right now let's ignore the issue of having some operations handled by DDLTask which
are not actual DDL operations (lock, unlock, desc...)
> In the interim time when there are two DDLTask and DDLWork classes in the code base the
new ones in the new package are called DDLTask2 and DDLWork2 thus avoiding the usage of fully
qualified class names where both the old and the new classes are in use.
> Step #9: extract all the column and constraint related operations from the old DDLTask,
and move them under the new package each.

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