[jira] Assigned: (DERBY-2917) Refactor DataTypeDescriptor and TypeDescriptor to result in cleaner code.

["Daniel John Debrunner (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-2917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel John Debrunner reassigned DERBY-2917:
--------------------------------------------

    Assignee: Daniel John Debrunner

> Refactor DataTypeDescriptor and TypeDescriptor to result in cleaner code.
> -------------------------------------------------------------------------
>
>                 Key: DERBY-2917
>                 URL: https://issues.apache.org/jira/browse/DERBY-2917
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Services, SQL
>            Reporter: Daniel John Debrunner
>            Assignee: Daniel John Debrunner
>
> TypeDescriptor ideally represents a catalog type (column in a table, parameter in a procedure etc.)
> DataTypeDescriptor represents a runtime type
> Currently DataTypeDescriptor  extends (implements) TypeDescriptor , but the relationship would be cleaner if DataTypeDescriptor  had a TypeDescriptor (but was not a TypeDescriptor).
> One can at the moment obtain a TypeDescriptor from a DataTypeDescriptor  using DataTypeDescriptor.getCatalogType() but most code just treats DataTypeDescriptor   as a TypeDescriptor. This has lead to a couple of issues:
> 1) When a routine's parameter/return type is written out a DataTypeDescriptor is written to disk. This results in type information being repeated in the serialized form, thus increasing the on-disk size of a Derby database.
> 2) Collation derivation is runtime only (all persistent types by definition have implicit type) but the derivation is on the catalog Typedescriptor interface.

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