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From "Daniel Barclay (Drill) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DRILL-4010) In HBase reader, create child vectors for referenced HBase columns to avoid spurious schema changes
Date Sat, 19 Dec 2015 19:59:46 GMT

     [ https://issues.apache.org/jira/browse/DRILL-4010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Barclay (Drill) resolved DRILL-4010.
-------------------------------------------
    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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