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ASF GitHub Bot commented on DRILL-6585: --------------------------------------- vrozov commented on issue #1367: DRILL-6585: PartitionSender clones vectors, but shares field metdata URL: https://github.com/apache/drill/pull/1367#issuecomment-404355666 @paul-rogers I am somewhat OK with the code changes granted that they fix the issue. My concerns are (in random order) - Usage of the `clone()` where copy constructor should be used (see [Copy Constructor versus Cloning](https://www.artima.com/intv/bloch13.html)) - Improper implementation of `clone()` by the `MaterializedField` - Unclear semantics when `MaterializedField` needs to be cloned - Should not by the time `InitializedBatch` is called, `MaterializedField` for incoming vectors be fully initialized? If they are, what causes changes in outgoing vectors `MaterializedField` and if they are not, how changes to `MaterializedField` in incoming vectors will be propagated to outgoing vectors `MaterializedField` once they refer to a deep copy? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > 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 forĀ [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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)