Rainer Döbele created EMPIREDB-491:
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Summary: DBQuery: swap collections for DBQueryColumns and original
query columns
Key: EMPIREDB-491
URL: https://issues.apache.org/jira/browse/EMPIREDB-491
Project: Empire-DB
Issue Type: Improvement
Components: Core
Reporter: Rainer Döbele
Assignee: Rainer Döbele
Historically DBQuery used the columns collection inherited from DBRowSet to
hold the column expressions of the underlying query. Hence DBQuery.getColumns()
retured the underlying table columns rather than DBQueryColumn which reference
the query. Accordingly the function DBQuery.getQueryColumns() returned the
collection of DBQueryColumn.
This led to several special case handlings for DBQuery.
A cleaner approach ist to use the olumns collection inherited from DBRowSet for
the DBQueryColumns created for this query and vice versa use
DBQuery.getQueryColumns() to return the underlying query columns. However to
provide backward compatibility access to the underlying query columns should be
named differently.
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