Miklos Gergely created HIVE-21881:
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Summary: Break up DDLTask - extract rest of the operations
Key: HIVE-21881
URL: https://issues.apache.org/jira/browse/HIVE-21881
Project: Hive
Issue Type: Sub-task
Components: Hive
Affects Versions: 3.1.1
Reporter: Miklos Gergely
Assignee: Miklos Gergely
Fix For: 4.0.0
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 #10: extract the alter table operations that left from the old DDLTask,
and move them under the new packages.
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