[GitHub] [hive] miklosgergely opened a new pull request #703: HIVE-21959 Clean up Concatenate and Msck DDL commands

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miklosgergely opened a new pull request #703: HIVE-21959 Clean up Concatenate and Msck DDL commands
URL: https://github.com/apache/hive/pull/703
 
 
   Concatenate and Msck DDL use basic data structure implementations instead of their interfaces for variable declaration, like ArrayList instead of List, LinkedHashMap instead of Map, etc. This is due to a lot of similar issues in the code, which needs to be cleaned.
   
   Concatenate also had a non-immutable Desc class, that needs to be transformed into an immutable one. Concatenate operation code should be cut into smaller functions.

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