GitHub user sanjaydasgupta opened a pull request:
https://github.com/apache/zeppelin/pull/3068
[ZEPPELIN-3438] Passing Z variables to BigQuery
### What is this PR for?
This PR enables the interpolation of ZeppelinContext objects into the
paragraph text of BigQuery cells. It also introduces a new interpreter-level
configuration parameter named `zeppelin.bigquery.interpolation`. This new
parameter is `false` by default, and must be set to `true` to enable object
interpolation. The default value of `false` guarantees backward compatibility
for users who are not aware of the new feature.
The implementation takes the same approach that was followed in PR
[2898](https://github.com/apache/zeppelin/pull/2898) and
[2903](https://github.com/apache/zeppelin/pull/2903).
### What type of PR is it?
[ Feature ]
### Todos
* [ ] - Task
### What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-3438
### How should this be tested?
Two new unit test classes have been added:
[BigQueryInterpolationDisabled.java](https://github.com/sanjaydasgupta/zeppelin/blob/572c2aaa7a96eca98cdef4c77044dfc7a359f89f/bigquery/src/test/java/org/apache/zeppelin/bigquery/BigQueryInterpolationDisabled.java),
and
[BigQueryInterpolationEnabled.java](https://github.com/sanjaydasgupta/zeppelin/blob/572c2aaa7a96eca98cdef4c77044dfc7a359f89f/bigquery/src/test/java/org/apache/zeppelin/bigquery/BigQueryInterpolationEnabled.java).
Also, the code in this PR merely causes the BigQuery interpreter to
"opt-in" to the implementation of z-variable interpolation already existing in
the Interpreter base class - described in
[PR-2898](https://github.com/apache/zeppelin/pull/2898). The unit tests
necessary for testing z-variable interpolation in detail are already present in
PR-2898
### Screenshots (if appropriate)
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? Yes, documentation changes provided in
[bigquery.md](https://github.com/sanjaydasgupta/zeppelin/blob/572c2aaa7a96eca98cdef4c77044dfc7a359f89f/docs/interpreter/bigquery.md)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sanjaydasgupta/zeppelin
z3438-zeppelin-variables-for-bigquery
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zeppelin/pull/3068.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 #3068
----
commit 572c2aaa7a96eca98cdef4c77044dfc7a359f89f
Author: Sanjay Dasgupta <sanjay.dasgupta@...>
Date: 2018-07-13T04:59:36Z
z3438-zeppelin-variables-for-bigquery
----
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