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https://issues.apache.org/jira/browse/METRON-980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034549#comment-16034549
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ASF GitHub Bot commented on METRON-980:
---------------------------------------
Github user ottobackwards commented on a diff in the pull request:
https://github.com/apache/metron/pull/606#discussion_r119838139
--- Diff:
metron-platform/metron-common/src/main/java/org/apache/metron/common/stellar/BaseStellarProcessor.java
---
@@ -163,7 +164,14 @@ public T parse(final String rule, final
VariableResolver variableResolver, final
lexer.removeErrorListeners();
lexer.addErrorListener(new ErrorListener());
TokenStream tokens = new CommonTokenStream(lexer);
- StellarParser parser = new StellarParser(tokens);
+ StellarParser parser = new StellarParser(tokens) {
--- End diff --
What is going on here?
> 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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