Paul Rogers created DRILL-6585:
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Summary: PartitionSender clones vectors, but shares field metdata
Key: DRILL-6585
URL: https://issues.apache.org/jira/browse/DRILL-6585
Project: Apache Drill
Issue Type: Bug
Affects Versions: 1.13.0
Reporter: Paul Rogers
Assignee: Paul Rogers
See the discussion for [PR #1244 for
DRILL-6373|https://github.com/apache/drill/pull/1244].
The PartitionSender clones vectors. But, it does so by reusing the
{{MaterializedField}} from the original vector. Though the original authors of
{{MaterializedField}} apparently meant it to be immutable, later changes for
maps and unions ended up changing it to add members.
When cloning a map, we get the original map materialized field, then start
doctoring it up as we add the cloned map members. This screws up the original
map vector's metadata.
The solution is to clone an empty version of the materialized field when
creating a new vector.
But, since much code creates vectors by giving a perfectly valid, unique
materialized field, we want to add a new method for use by the ill-behaved
uses, such as PartitionSender, that ask to create a new vector without cloning
the materialized field.
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