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From XuMingmin <...@git.apache.org>
Subject [GitHub] beam pull request #3250: [Beam-2010] expose programming interface
Date Sat, 27 May 2017 22:08:13 GMT
GitHub user XuMingmin opened a pull request:

    https://github.com/apache/beam/pull/3250

    [Beam-2010] expose programming interface

    It's the DSL implementation described in [Apache Beam: design of DSL SQL interface](https://docs.google.com/document/d/1uWXL_yF3UUO5GfCxbL6kWsmC8xCWfICU3RwiQKsk7Mk/edit?usp=sharing).

    
    It provides two methods `BeamSql.simpleQuery(...)` and `BeamSql.query(...)` to integrate
SQL in Beam pipeline, by converting it into a `PTransform`, refer to `org.apache.beam.dsls.sql.example.BeamSqlExample`
as a quick example.
    
    Along with this DSL methods, some functions in the back-end are changed:
    1. `BeamSqlRowCoder` is updated to have a input parameter `BeamSQLRecordType`, to declare
row format, and it cannot be registered during initialization any more;
    2. Interface in `BeamRelNode` is changed, to align with the goal, converting into PTransform;
    
    The methods for CLI client are marked as `Experimental` in `BeamSql`, the difference is
handled in `BeamIOSourceRel`, that whether an upstream PCollection is there, or need to generate
from `BaseBeamTable`;


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

    $ git pull https://github.com/XuMingmin/beam BEAM-2010

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

    https://github.com/apache/beam/pull/3250.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 #3250
    
----
commit 3f0c2c356a83163f165684e07b24bbcc9f759ab7
Author: mingmxu <mingmxu@ebay.com>
Date:   2017-05-27T05:07:03Z

    DSL interface for Beam SQL

----


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