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From "Sushanth Sowmyan (JIRA)" <>
Subject [jira] [Created] (HIVE-4816) Followup from HIVE-4551 : Reworking HCat Record Transformation
Date Wed, 03 Jul 2013 23:06:22 GMT
Sushanth Sowmyan created HIVE-4816:

             Summary: Followup from HIVE-4551 : Reworking HCat Record Transformation
                 Key: HIVE-4816
             Project: Hive
          Issue Type: Improvement
            Reporter: Sushanth Sowmyan
            Assignee: Sushanth Sowmyan

This is a post-bug followup from HIVE-4551, to refactor some HCatalog code to be cleaner/neater.
Reposting contents from my previous jira, this jira needs to track the following:

a) HCatRecord and HCatSchema reflect underlying raw data and do no promotions.
 b) Introduce a ConversionImpl, which defines various datatype conversion functions, which
all default to returning the input, and having a config that allows a user which conversions
are implemented.
 c) Introduce a PromotedHCatRecord & PromotedHCatSchema that wrap HCatRecord/HCatSchema
and use a ConversionImpl.
 d) Implement a PigLoaderConversionImpl/PigStorerConversionImpl in hcat-pig-adapter, which
implements the following: Short->Int promotion, Short->Int promotion, Boolean->Int
 e) Have HCatLoader/HCatStorer use the promoted versions of HCatRecord/HCatSchema which use
the PigConversionImpl.
 f) Remove the current HCatContext promotion parameters and make them be HCatLoader/HCatStorer

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