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
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commit 3f0c2c356a83163f165684e07b24bbcc9f759ab7
Author: mingmxu <ming...@ebay.com>
Date: 2017-05-27T05:07:03Z
DSL interface for Beam SQL
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