Miklos Gergely created HIVE-21292:
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Summary: Break up DDLTask - extract Database related operations
Key: HIVE-21292
URL: https://issues.apache.org/jira/browse/HIVE-21292
Project: Hive
Issue Type: Improvement
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...)
Step #1: extract all the database related operations from the old DDLTask, and
move them under the new package. Also create the new internal framework.
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