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From "Paul Rogers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-5688) Add repeated map support to column accessors
Date Sun, 18 Mar 2018 01:34:00 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paul Rogers updated DRILL-5688:
-------------------------------
    Fix Version/s: 1.13.0

> Add repeated map support to column accessors
> --------------------------------------------
>
>                 Key: DRILL-5688
>                 URL: https://issues.apache.org/jira/browse/DRILL-5688
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.12.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Major
>             Fix For: 1.13.0
>
>
> DRILL-5211 describes how Drill runs into OOM issues due to Drill's two allocators: Netty
and Unsafe. That JIRA also describes the solution: limit vectors to 16 MB in length (with
the eventual goal of limiting overall batch size.) DRILL-5517 added "size-aware" support to
the column accessors created to parallel Drill's existing readers and writers. (The parallel
implementation ensures that we don't break existing code that uses the existing mechanism;
same as we did for the external sort.)
> This ticket describes work to extend the column accessors to handle repeated maps and
lists. Key themes:
> * Define a common metadata schema for use in this layer and the "result set loader" of
DRILL-5657. This schema layer builds on top of the existing schema to add the kind of metadata
needed here and by the "sizer" created for the external sort.
> * Define a JSON-like reader and writer structure that supports the full Drill data model
semantics. (The earlier version focused on the scalar types and arrays of scalars to prove
the concept of limiting vector sizes.)
> * Revising test code to use the revised column writer structure.
> Implementation details appear in the PR.



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