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Posted to commits@cassandra.apache.org by "Berenguer Blasi (JIRA)" <ji...@apache.org> on 2016/09/02 06:50:20 UTC

[jira] [Created] (CASSANDRA-12598) BailErrorStragery alike for ANTLR grammar parsing

Berenguer Blasi created CASSANDRA-12598:
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             Summary: BailErrorStragery alike for ANTLR grammar parsing
                 Key: CASSANDRA-12598
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12598
             Project: Cassandra
          Issue Type: Bug
          Components: CQL
            Reporter: Berenguer Blasi
             Fix For: 3.10


CQL parsing is missing a mechanism similar to http://www.antlr.org/api/Java/org/antlr/v4/runtime/BailErrorStrategy.html

This solrves:
- Stopping parsing instead of continuing when we've got already an error, which is wasteful
- Any skipped java code tied to 'recovered' missing tokens might later cause java exceptions (think non-init variables, non incremented integers (div by zero), etc.) which will bubble up directly and will hide properly formatted error messages to the user with no indication on what went wrong at all. Just a cryptic NPE i.e



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