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https://issues.apache.org/jira/browse/CALCITE-3381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16942357#comment-16942357
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Kirill Kozlov commented on CALCITE-3381:
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[~amaliujia], feel free to work on this, thanks for volunteering!
> When generating SQL for BigQuery (via unparsing), convert Calcite SQL types
> to BigQuery types
> ---------------------------------------------------------------------------------------------
>
> Key: CALCITE-3381
> URL: https://issues.apache.org/jira/browse/CALCITE-3381
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.21.0
> Reporter: Kirill Kozlov
> Priority: Minor
>
> When using `SqlImplementor.SimpleContext#toSql` with BigQuerySqlDialect on
> Rel nodes containing `CAST` need to convert Calcite SqlTypeName to BigQuery
> supported types
> ([https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types]).
> I believe this can be accomplished by Overriding
> BigQuerySqlDialect#getCastSpec method.
> Example: VARCHAR should become a STRING, BOOLEAN - BOOL, and so on.
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