Investigate reducing the number of classes & methods in DataDictionary used to
represent system tables
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Key: DERBY-1674
URL: http://issues.apache.org/jira/browse/DERBY-1674
Project: Derby
Issue Type: Improvement
Components: SQL
Reporter: Daniel John Debrunner
Assigned To: Daniel John Debrunner
Priority: Minor
Currently two classes exists for each system table, one to represent the table
(e.g.SYSTABLESRowFactory) , one to represent a row (e.g. TableDescriptor)
Look at having a single row factory (CatalogRowFactory) and using polymorphism
(method overloading) on the descriptor objects to perform the work
that is done today (e.g. converting a descriptor to and from a Row object).
In addition the DataDictionary has a specific method to drop each type of
unique descriptor (e.g. dropSPSDescriptor, dropAliasDescriptor)
Would it be possible to have a single dropDescriptor(UniqueSQLObjectDescriptor)
method and again use polymorphism on the descriptors.
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