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https://issues.apache.org/jira/browse/CALCITE-3282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915407#comment-16915407
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Danny Chan commented on CALCITE-3282:
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The key point is that we don't want the SqlTypeNameSpec/SqlDataTypeSpec to have
a mess of branches to handle kinds of sql dialects unparse logic. Let's keep
them clean from sql dialects and do these "dialect" thing in SqlDialect itself.
> Make every SqlDialect unparse their own data type
> -------------------------------------------------
>
> Key: CALCITE-3282
> URL: https://issues.apache.org/jira/browse/CALCITE-3282
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: feng huang
> Priority: Minor
>
> Every database might have different type or same type but different type
> name, therefore making every SqlDialect unparse their own data type is a
> suitable way.
> For example, there is a sql “select cast(col as int) from table” change to
> hive sql "select cast(col as integer) from table", but "integer" is not
> allowed in hive.
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