GitHub user beyond1920 opened a pull request:
https://github.com/apache/flink/pull/2923
[FLINK-5220] [Table API & SQL] Flink SQL projection pushdown
This pr aims to do projection pushdown optimization.
There are two commits here, first one is linked to
[https://issues.apache.org/jira/browse/FLINK-5185](url), it is the pre work;
second commit is merely about projection pushdown work. So it's maybe better to
start with the second commit.
The main changes including:
1. add PushProjectIntoBatchTableSourceScanRule to match
DataSetCalc->BatchTableSourceScan
2. add ProjectableTableSource to represent a TableSource which supports
Projection pushdown
3. change BatchScan cost compute logic
4. add a test case
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/alibaba/flink jira-5220
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2923.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 #2923
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commit 6f4ecf2efaf424505e05c2d9142c90da24e12ed1
Author: beyond1920 <beyond1...@126.com>
Date: 2016-11-29T04:26:02Z
Decouple BatchTableSourceScan with TableSourceTable
modify constructor of BatchScan, BatchTableSourceScan, DataSetScan
Test Plan: junit
Reviewers: kete.yangkt
Differential Revision: http://phabricator.taobao.net/D6601
modify code style and extract common method
let rule decide which tableSource to create a BatchTableScan
Decouple BatchTableSourceScan with TableSourceTable
make long length shorter to pass the flink code style check
commit 181f7f7d4362799549f9ad3e7da2e69838c0f834
Author: beyond1920 <beyond1...@126.com>
Date: 2016-12-02T03:33:12Z
push project down into BatchTableSourceScan
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