[GitHub] [calcite] danny0405 edited a comment on issue #1321: [CALCITE-3200] Add TEXT Data Type

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danny0405 edited a comment on issue #1321: [CALCITE-3200] Add TEXT Data Type
URL: https://github.com/apache/calcite/pull/1321#issuecomment-514123501
 
 
   > @danny0405 sorry, I not find through add a sql dialect data type or make it pluggable and have a clear interface. Can you give me some suggestions? thanks.
   
   I'm sorry that the data type in Calcite is not pluggable now, actually it is hard to make it pluggable because data type can be touched everywhere, from the sql query parse to sql-to-rel conversion and the planning phrase.
   
   In some engines like Apache Flink, we have our timeAttribute type as a sub-class of Timestamp type, then we can inherit the Timestamp type's type inference, the type precedence, the type assignment and etc. But we rarely to extend the core data types(make fresh new one).

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