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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