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https://issues.apache.org/jira/browse/DRILL-4010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Barclay (Drill) resolved DRILL-4010.
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Resolution: Fixed
Resolved as part of DRILL-2288 patch.
> In HBase reader, create child vectors for referenced HBase columns to avoid
> spurious schema changes
> ---------------------------------------------------------------------------------------------------
>
> Key: DRILL-4010
> URL: https://issues.apache.org/jira/browse/DRILL-4010
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Data Types, Storage - HBase
> Reporter: Daniel Barclay (Drill)
> Assignee: Daniel Barclay (Drill)
>
> {{HBaseRecordReader}} needs to create child vectors for all
> referenced/requested columns.
> Currently, if a fragment reads only HBase rows that don't have a particular
> referenced column (within a given column family), downstream code adds a
> dummy column of type {{NullableIntVector}} (as a child in the {{MapVector}}
> for the containing HBase column family).
> If any other fragment reads an HBase row that _does_ contain the referenced
> column, that fragment's reader will create a child
> {{NullableVarBinaryVector}} for the referenced column.
> When the data from those two fragments comes together, Drill detects a schema
> change, even though logically there isn't really any schema change.
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