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https://issues.apache.org/jira/browse/DRILL-7414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16955991#comment-16955991
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ASF GitHub Bot commented on DRILL-7414:
---------------------------------------
arina-ielchiieva commented on pull request #1878: DRILL-7414: EVF incorrectly
sets buffer writer index after rollover
URL: https://github.com/apache/drill/pull/1878#discussion_r336971442
##########
File path:
exec/vector/src/main/java/org/apache/drill/exec/vector/accessor/writer/OffsetVectorWriterImpl.java
##########
@@ -290,7 +290,7 @@ public void preRollover() {
// rows. But, this being an offset vector, we add one to account
// for the extra 0 value at the start.
- setValueCount(vectorIndex.rowStartIndex() + 1);
+ setValueCount(vectorIndex.rowStartIndex());
Review comment:
` But, this being an offset vector, we add one to account for the extra 0
value at the start.` - Should this comment be updated after the change?
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> EVF incorrectly sets buffer writer index after rollover
> -------------------------------------------------------
>
> Key: DRILL-7414
> URL: https://issues.apache.org/jira/browse/DRILL-7414
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Minor
>
> A full test run, with vector validation enabled and with the "new" scan
> enabled, revealed the following in {{TestMockPlugin.testSizeLimit()}}:
> {noformat}
> comments_s20000 - VarCharVector: Row count = 838, but value count = 839
> {noformat}
> Adding vector validation to the result set loader overflow tests reveals that
> the problem is in overflow. In
> {{TestResultSetLoaderOverflow.testOverflowWithNullables()}}:
> {noformat}
> a - RepeatedIntVector: Row count = 2952, but value count = 2953
> b - RepeatedVarCharVector: Row count = 2952, but value count = 2953
> b - RepeatedVarCharVector: Vector has 2953 values, but offset vector labels
> 32472 values
> c - RepeatedIntVector: Row count = 2952, but value count = 2953
> d - RepeatedIntVector: Row count = 2952, but value count = 2953
> {noformat}
> The problem is that EVF incorrectly sets the offset buffer writer index after
> a rollover.
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