Eric Hanson created HIVE-5762:
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Summary: Implement vectorized support for the DECIMAL data type
Key: HIVE-5762
URL: https://issues.apache.org/jira/browse/HIVE-5762
Project: Hive
Issue Type: Sub-task
Reporter: Eric Hanson
Add support to allow queries referencing DECIMAL columns and expression results
to run efficiently in vectorized mode. Include unit tests and end-to-end
tests.
Before starting or at least going very far, please write design specification
(a new section for the design spec attached to HIVE-4160) for how support for
the different DECIMAL types should work in vectorized mode, and the roadmap,
and have it reviewed.
It may be feasible to re-use LongColumnVector and related VectorExpression
classes for fixed-point decimal in certain data ranges. That should be at least
considered to get faster performance and save code. For unlimited precision
DECIMAL, a new column vector subtype may be needed, or a BytesColumnVector
could be re-used.
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