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https://issues.apache.org/jira/browse/DRILL-3955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Barclay (Drill) resolved DRILL-3955.
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Resolution: Fixed
Resolved as part of DRILL-2288 patch.
> Possible bug in creation of Drill columns for HBase column families
> -------------------------------------------------------------------
>
> Key: DRILL-3955
> URL: https://issues.apache.org/jira/browse/DRILL-3955
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Daniel Barclay (Drill)
> Assignee: Daniel Barclay (Drill)
>
> If all of the rows read by a given {{HBaseRecordReader}} have no HBase
> columns in a given HBase column family, {{HBaseRecordReader}} doesn't create
> a Drill column for that HBase column family.
> Later, in a {{ProjectRecordBatch}}'s {{setupNewSchema}}, because no Drill
> column exists for that HBase column family, that {{setupNewSchema}} creates a
> dummy Drill column using the usual {{NullableIntVector}} type. In
> particular, it is not a map vector as {{HBaseRecordReader}} creates when it
> sees an HBase column family.
> Should {{HBaseRecordReader}} and/or something around setting up for reading
> HBase (including setting up that {{ProjectRecordBatch}}) make sure that all
> HBase column families are represented with map vectors so that
> {{setupNewSchema}} doesn't create a dummy field of type {{NullableIntVector}}?
> The problem is that, currently, when an HBase table is read in two separate
> fragments, one fragment (seeing rows with columns in the column family) can
> get a map vector for the column family while the other (seeing only rows with
> no columns in the column familar) can get the {{NullableIntVector}}.
> Downstream code that receives the two batches ends up with an unresolved
> conflict, yielding IndexOutOfBoundsExceptions as in DRILL-3954.
> It's not clear whether there is only one bug\--that downstream code doesn't
> resolve {{NullableIntValue}} dummy fields right (DRILL-TBD)\--or two\--that
> the HBase reading code should set up a Drill column for every HBase column
> family (regardless of whether it has any columns in the rows that were read)
> and that downstream code doesn't resolve {{NullableIntValue}} dummy fields
> (resolution is applicable to sources other than just HBase).
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