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From "Dyre Tjeldvoll (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2226) Move column bitset computation to IndexToBaseRowNode
Date Wed, 10 Jan 2007 11:08:27 GMT
Move column bitset computation to IndexToBaseRowNode
----------------------------------------------------

                 Key: DERBY-2226
                 URL: https://issues.apache.org/jira/browse/DERBY-2226
             Project: Derby
          Issue Type: Improvement
            Reporter: Dyre Tjeldvoll
         Assigned To: Dyre Tjeldvoll
            Priority: Trivial


The constructor for IndexRowToBaseRowResultSet
takes a bitset describing the columns coming from the heap and a
bitset describing the columns coming from the index. But in every
IndexRowToBaseRowResultSet one also has to compute _all_ referenced
columns (union of heap and index bitsets), and frequently also those
columns _only_ coming from the heap (set difference between heap and
index).

But the value of these "set products" seem _only_ to depend on objects
that are fixed at compile time (in IndexToBaseRowNode), so it would be 
cleaner (and possibly more efficient) to compute these products there.


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