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https://issues.apache.org/jira/browse/METRON-980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034119#comment-16034119
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ASF GitHub Bot commented on METRON-980:
---------------------------------------
GitHub user cestella opened a pull request:
https://github.com/apache/metron/pull/606
METRON-980: Short circuit operations for Stellar
## Contributor Comments
Stellar does not currently contain short circuit operations. In most
languages, this is an important optimization, but for Stellar on Metron, this
is a requirement due to the fact that some variables may be null legitimately
and we cannot create multi-line conditionals or temporary variables at the
moment.
The short circuit operations supported:
* short circuited `or` (e.g. `true or FUNC(...)` would never execute `FUNC`)
* short circuited `and` (e.g. `false and FUNC(...)` would never execute
`FUNC`)
* short circuited if/then/else (e.g. `if true then FUNC(...) else
FUNC2(...)` will never call `FUNC2`)
This should be tested entirely via the unit tests for Stellar. Please
review the tests and ensure I've not missed a test case, reviewers.
## Pull Request Checklist
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### For all changes:
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#### Note:
Please ensure that once the PR is submitted, you check travis-ci for build
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It is also recommended that [travis-ci](https://travis-ci.org) is set up
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You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cestella/incubator-metron
short_circuit_stellar
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/metron/pull/606.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 #606
----
commit c2a65b200c49a0ab748edf116f23a51b4811e66f
Author: cstella <[email protected]>
Date: 2017-05-15T16:18:07Z
Added test to verify shortcutting works.
commit 0c86c2a93216b9f0418e22b78de56c0facb6f55a
Author: cstella <[email protected]>
Date: 2017-05-23T17:59:41Z
Merge branch 'master' into short_circuit_stellar
commit d038f5c8738b11bba61d3f6cf07abf78b434f883
Author: cstella <[email protected]>
Date: 2017-06-02T04:21:30Z
Short circuit operations.
commit ac9ee328ba56296621a982d279a7c356d8a6d82c
Author: cstella <[email protected]>
Date: 2017-06-02T04:21:54Z
Merge branch 'master' into short_circuit_stellar
commit 7fe0e9b636e3fc6e7642af36de5d57261f6f3b78
Author: cstella <[email protected]>
Date: 2017-06-02T04:31:46Z
Updating some docs.
----
> Short circuit operations for Stellar
> ------------------------------------
>
> Key: METRON-980
> URL: https://issues.apache.org/jira/browse/METRON-980
> Project: Metron
> Issue Type: Improvement
> Reporter: Casey Stella
> Assignee: Casey Stella
>
> Stellar does not currently contain short circuit operations. In most
> languages, this is an important optimization, but for Stellar on Metron, this
> is a requirement due to the fact that some variables may be null legitimately
> and we cannot create multi-line conditionals or temporary variables at the
> moment.
> The short circuit operations supported:
> * short circuited `or` (e.g. true or FUNC(...) would never execute FUNC)
> * short circuited `and` (e.g. false and FUNC(...) would never execute FUNC)
> * short circuited if/then/else (e.g. if true then FUNC(...) else FUNC2(...)
> will never call FUNC2)
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