Zoltan Haindrich commented on HIVE-22526:


> Extract Compiler from Driver
> ----------------------------
>                 Key: HIVE-22526
>                 URL: https://issues.apache.org/jira/browse/HIVE-22526
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Hive
>            Reporter: Miklos Gergely
>            Assignee: Miklos Gergely
>            Priority: Major
>             Fix For: 4.0.0
>         Attachments: HIVE-22526.01.patch, HIVE-22526.02.patch, 
> HIVE-22526.03.patch, HIVE-22526.04.patch, HIVE-22526.05.patch, 
> HIVE-22526.06.patch, HIVE-22526.07.patch, HIVE-22526.08.patch, 
> HIVE-22526.09.patch
> The Driver class contains ~600 lines of code responsible for compiling the 
> command. That means that from the command String a Plan needs to be created, 
> and also a transaction needs to be started (in most of the cases). This is a 
> thing done by the compile function, which has a lot of sub functions to help 
> this task, while itself is also really big. All these codes should be put 
> into a separate class, where it can do it's job without getting mixed with 
> the other codes in the Driver.

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