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Posted to derby-dev@db.apache.org by "Mamta A. Satoor (JIRA)" <ji...@apache.org> on 2012/10/02 06:45:07 UTC
[jira] [Updated] (DERBY-2917) Refactor DataTypeDescriptor and
TypeDescriptor to result in cleaner code.
[ https://issues.apache.org/jira/browse/DERBY-2917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mamta A. Satoor updated DERBY-2917:
-----------------------------------
Urgency: Normal
Labels: derby_triage10_10 (was: )
> 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
> Labels: derby_triage10_10
>
> 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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