ffmax opened a new pull request #1402: make every SqlDialect parse their own data type URL: https://github.com/apache/calcite/pull/1402 Every database might have different type or same type but different type name, therefore making every SqlDialect parse their own data type is a suitable way. for example, “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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