[jira] [Commented] (DRILL-5152) Enhance the mock data source: better data, SQL access

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15781875#comment-15781875 ] 

ASF GitHub Bot commented on DRILL-5152:
---------------------------------------

GitHub user paul-rogers opened a pull request:

    https://github.com/apache/drill/pull/708

    DRILL-5152: Enhance the mock data source: better data, SQL access

    Provides an enhanced version of the mock data source. See the JIRA entry for motivation, package-info.java for details of operation.
    
    Allows tests to write queries of the form:
    ```
    select id_i, name_s50 from `mock`.`employee_1K` ...
    ```
    Where id_i is a field of random, uniformly distributed integers and name_s50 is a VARCHAR column of width 50 of randomly generated strings. The _1K suffix says to generate 1000 rows. The names are just for convenience, the suffixes tell the mock data source what to generate.
    
    Examples of use will appear in a later commit that includes a revised test framework. Existing tests that use the physical plan version of the mock data source work as before.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/paul-rogers/drill DRILL-5152

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/drill/pull/708.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #708
    
----
commit e9741ce59621209e18cf405c8fe4a614d955ed2a
Author: Paul Rogers <pr...@maprtech.com>
Date:   2016-12-22T05:47:20Z

    DRILL-5152: Enhance the mock data source: better data, SQL access
    
    Provides an enhanced version of the mock data source. See the JIRA
    entry for motivation, package-info.java for details of operation.

----


> Enhance the mock data source: better data, SQL access
> -----------------------------------------------------
>
>                 Key: DRILL-5152
>                 URL: https://issues.apache.org/jira/browse/DRILL-5152
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Tools, Build & Test
>    Affects Versions: 1.9.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Minor
>
> Drill provides a mock data storage engine that generates random data. The mock engine is used in some older unit tests that need a volume of data, but that are not too particular about the details of the data.
> The mock data source continues to have use even for modern tests. For example, the work in the external storage batch requires tests with varying amounts of data, but the exact form of the data is not important, just the quantity. For example, if we want to ensure that spilling happens at various trigger points, we need to read the right amount of data for that trigger.
> The existing mock data source has two limitations:
> 1. It generates only "black/white" (alternating) values, which is awkward for use in sorting.
> 2. The mock generator is accessible only from a physical plan, but not from SQL queries.
> This enhancement proposes to fix both limitations:
> 1. Generate a uniform, randomly distributed set of values.
> 2. Provide an encoding that lets a SQL query specify the data to be generated.
> Example SQL query:
> {code}
> SELECT id_i, name_s50 FROM `mock`.employee_10K;
> {code}
> The above says to generate two fields: INTEGER (the "_i" suffix) and VARCHAR(50) (the "_s50") suffix; and to generate 10,000 rows (the "_10K" suffix on the table.)



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