[jira] [Created] (IMPALA-7867) Expose collection interfaces, not implementations

["Paul Rogers (JIRA)" <ji...@apache.org>]

Paul Rogers created IMPALA-7867:
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             Summary: Expose collection interfaces, not implementations
                 Key: IMPALA-7867
                 URL: https://issues.apache.org/jira/browse/IMPALA-7867
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
    Affects Versions: Impala 3.0
            Reporter: Paul Rogers
            Assignee: Paul Rogers


When using Java collections, a common Java best practice is to expose the collection interface, but hide the implementation choice. This pattern allows us to start with a generic implementation (an {{ArrayList}}, say), but evolve to a more specific implementation to achieve certain goals (a {{LinkedList}} or {{ImmutableList}}, say.)

For whatever reason, the Impala FE code exposes {{ArrayList}}, {{HashMap}} and other implementation choices as variable types and in method signatures.

This ticket tracks a gradual process of revising the declarations and signatures to use the interfaces {{List}} instead of the implementation {{ArrayList}}.



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