Paul Rogers created DRILL-5657:
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Summary: Extend column accessors to be size-aware
Key: DRILL-5657
URL: https://issues.apache.org/jira/browse/DRILL-5657
Project: Apache Drill
Issue Type: Improvement
Affects Versions: 1.11.0
Reporter: Paul Rogers
Assignee: Paul Rogers
Fix For: 1.11.0
A recent extension to Drill's set of test tools created a "row set" abstraction
to allow us to create, and verify, record batches with very few lines of code.
Part of this work involved creating a set of "column accessors" in the vector
subsystem. Column readers provide a uniform API to obtain data from columns
(vectors), while column writers provide a uniform writing interface.
DRILL-5211 discusses a set of changes to limit value vectors to 16 MB in size
(to avoid memory fragmentation due to Drill's two memory allocators.) The
column accessors have proven to be so useful that they will be the basis for
the new, size-aware writers used by Drill's record readers.
A step in that direction is to retrofit the column writers to use the
size-aware {{setScalar()}} and {{setArray()}} methods introduced in DRILL-5517.
Since the test framework row set classes are (at present) the only consumer of
the accessors, those classes must also be updated with the changes.
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