Kirill Kozlov created CALCITE-3381:
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             Summary: Add `getCastSpec` for BigQuerySqlDialect
                 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


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]).

Example: VARCHAR should become a STRING, BOOLEAN - BOOL, and so on.



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