GitHub user vasia opened a pull request:
https://github.com/apache/flink/pull/1917
[FLINK-3727] Embedded streaming SQL projection, filtering, union
This PR adds support for embedded streaming SQL (projection, filtering,
union):
- methods to register DataStreams
- sql translation method in StreamTableEnvironment
- a custom rule to convert to streamable table
- docs for streaming table and sql
- java SQL tests
A streaming SQL query can be executed on a streaming Table by simply adding
the `STREAM` keyword in front of the table name. Registering DataStream tables
and conversions work in a similar way to that of DataStream tables.
Here's a filtering example:
```
val env = StreamExecutionEnvironment.getExecutionEnvironment
val tEnv = TableEnvironment.getTableEnvironment(env)
val dataStream = env.addSource(...)
val t = dataStream.toTable(tEnv).as('a, 'b, 'c)
tEnv.registerTable("MyTable", t)
val sqlQuery = "SELECT STREAM * FROM MyTable WHERE a = 3"
val result = tEnv.sql(sqlQuery).toDataStream[Row]
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vasia/flink stream-sql
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1917.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 #1917
----
commit 6b747bd6902074d0475de9519c1c3bd693487eef
Author: vasia <[email protected]>
Date: 2016-04-15T11:35:24Z
[FLINK-3727] Add support for embedded streaming SQL (projection, filter,
union)
- add methods to register DataStreams
- add sql translation method in StreamTableEnvironment
- add a custom rule to convert to streamable table
- add docs for streaming table and sql
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