GitHub user sachouche opened a pull request:
https://github.com/apache/drill/pull/1106
DRILL-6129: Fixed query failure due to nested column data type change
Problem Description -
- The Drillbit was able to successfully send batches containing different
metadata (for nested columns)
- This was the case when one or multiple scanners were involved
- The issue happened within the client where value vectors are cached
across batches
- The load(...) API is responsible for updating values vectors when a new
batch arrives
- The RecordBatchLoader class is used to detect schema changes ; if this is
the case, then previous value vectors are discarded and new ones created
- There is a bug with the current implementation where only first level
columns are compared
Fix -
- The fix is to improve the schema diff logic by including nested columns
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sachouche/drill DRILL-6129
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/1106.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1106
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commit 9ffb41f509cd2531e7f3cdf89a66605ec0fdf7a4
Author: Salim Achouche <sachouche2@...>
Date: 2018-02-01T02:59:58Z
DRILL-6129: Fixed query failure due to nested column data type change
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