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https://issues.apache.org/jira/browse/CALCITE-5346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17706583#comment-17706583
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TJ Banghart commented on CALCITE-5346:
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I opened CALCITE-5621 for root schema UDT declarations. It appears that
{{root}} might be this global value - or at least acts like it when type
lookups are performed for DDL and CAST statements.
> Support for type aliases
> ------------------------
>
> Key: CALCITE-5346
> URL: https://issues.apache.org/jira/browse/CALCITE-5346
> Project: Calcite
> Issue Type: New Feature
> Reporter: Will Noble
> Assignee: Will Noble
> Priority: Major
>
> We would like to support some sort of type alias functionality in order to
> map certain [BigQuery
> types|https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types]
> to ISO types, e.g. {{STRING}} → {{VARCHAR}}, {{BYTES}} →
> {{VARBINARY}}.
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