Move column bitset computation to IndexToBaseRowNode
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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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