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https://issues.apache.org/jira/browse/DRILL-6585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537894#comment-16537894
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ASF GitHub Bot commented on DRILL-6585:
---------------------------------------
paul-rogers commented on a change in pull request #1367: DRILL-6585:
PartitionSender clones vectors, but shares field metdata
URL: https://github.com/apache/drill/pull/1367#discussion_r201199910
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/partitionsender/PartitionerTemplate.java
##########
@@ -376,9 +376,8 @@ public void updateStats(FragmentWritableBatch
writableBatch) {
*/
public void initializeBatch() {
for (VectorWrapper<?> v : incoming) {
- // create new vector
- @SuppressWarnings("resource")
- ValueVector outgoingVector = TypeHelper.getNewVector(v.getField(),
allocator);
+ // create new vector by cloning the incoming vector's type
+ ValueVector outgoingVector = TypeHelper.getClonedVector(v.getField(),
allocator);
Review comment:
This is the heart of the change: this is the place where we were reusing
previously-owned materialized fields.
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> 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
> Priority: Major
>
> 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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