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https://issues.apache.org/jira/browse/DRILL-307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13830591#comment-13830591
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Mehant Baid commented on DRILL-307:
-----------------------------------
There are couple of known issues with this iteration of the patch. Tracked as
separate JIRA's : https://issues.apache.org/jira/browse/DRILL-308 ,
https://issues.apache.org/jira/browse/DRILL-310
> Remove _MAP[] from Drill SQL
> ----------------------------
>
> Key: DRILL-307
> URL: https://issues.apache.org/jira/browse/DRILL-307
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Mehant Baid
> Assignee: Mehant Baid
> Attachments: DRILL-307.patch
>
>
> Currently while executing SQL we need to use _MAP['columnname'] in the select
> statements.
> The problem while using select statements with columnnames instead of
> _MAP['columnname'] is that Optiq tries to verify that these columns exist in
> the schema and raises validation errors.
> The way we've solved the problem is to override the 'rowtype' returned to
> Optiq while creating a Drill table. We have defined a new class
> RelDataTypeDrillImpl which is the 'rowtype' returned to Optiq and will be
> invoked for any validation purposes. RelDataTypeDrillImpl always returns true
> when queried if a certain field exists in the table, with its type as 'ANY'.
> This gets us past the validation in Optiq and allows us to use column names
> directly in select statements.
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