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java.lang.Objectorg.apache.derby.impl.store.access.sort.MergeSort
org.apache.derby.impl.store.access.sort.UniqueWithDuplicateNullsMergeSort
final class UniqueWithDuplicateNullsMergeSort
This class extends and customizes MergeSort to support unique indexes with duplicate nulls. It overrides compare method to consider keypart - 1 parts of the keys while comparing (only for non null keys).
Field Summary |
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Fields inherited from class org.apache.derby.impl.store.access.sort.MergeSort |
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alreadyInOrder, columnOrdering, columnOrderingAscendingMap, columnOrderingMap, columnOrderingNullsLowMap, properties, sortBufferMax, sortBufferMin, sortObserver, template |
Constructor Summary | |
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UniqueWithDuplicateNullsMergeSort()
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Method Summary | |
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protected int |
compare(DataValueDescriptor[] r1,
DataValueDescriptor[] r2)
Compares two keys. |
Methods inherited from class org.apache.derby.impl.store.access.sort.MergeSort |
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checkColumnOrdering, checkColumnTypes, createMergeRun, doneInserting, doneScanning, doneScanning, drop, dropMergeRuns, initialize, open, openSortRowSource, openSortScan |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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UniqueWithDuplicateNullsMergeSort()
Method Detail |
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protected int compare(DataValueDescriptor[] r1, DataValueDescriptor[] r2) throws StandardException
compare
in class MergeSort
r1
- keysr2
- keys
StandardException
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Built on Thu 2010-12-23 20:49:13+0000, from revision ??? | ||||||||
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