Fennel: LcsCompareColKeyUsingOffsetIndex Class Reference (original) (raw)
This class implements the compare logic to sort the indices to the key offset vector, by comparing the data values stored at thse offsets. More...
#include <[LcsHash.h](LcsHash%5F8h-source.html)>
| Public Member Functions | |
|---|---|
| LcsCompareColKeyUsingOffsetIndex (SharedLcsClusterNodeWriter clusterBlockWriterInit, LcsHashTable *hashTableInit, TupleDescriptor const &colTupleDescInit, uint columnIdInit, UnalignedAttributeAccessor const &attrAccessorInit) | |
| Constructor. | |
| ~LcsCompareColKeyUsingOffsetIndex () | |
| bool | lessThan (const uint16_t colKeyOffsetIndex1, const uint16_t colKeyOffsetIndex2) |
| Compares the two values stored at the offsets located by the two indices. | |
| Private Attributes | |
| LcsHashTable * | hashTable |
| Reference to the Hash Table where cluster column values are inserted into. | |
| SharedLcsClusterNodeWriter | clusterBlockWriter |
| Reference to Node Writer to access the cluster column value. | |
| uint | columnId |
| Column Id for this cluster column. | |
| TupleDataWithBuffer | colTuple1 |
| Two tuple instances to store the values being compared. | |
| TupleDataWithBuffer | colTuple2 |
| TupleDescriptor | colTupleDesc |
| Tuple descriptor for the tuples being compared. | |
| UnalignedAttributeAccessor | attrAccessor |
Detailed Description
This class implements the compare logic to sort the indices to the key offset vector, by comparing the data values stored at thse offsets.
The sorted indices can then be used to encode the offsets when preparing a compressed batch to write out.
Definition at line 322 of file LcsHash.h.
Constructor & Destructor Documentation
| LcsCompareColKeyUsingOffsetIndex::~LcsCompareColKeyUsingOffsetIndex | ( | | ) | [inline] | | -------------------------------------------------------------------- | - | | - | ---------- |
Member Function Documentation
| bool LcsCompareColKeyUsingOffsetIndex::lessThan | ( | const uint16_t | colKeyOffsetIndex1, |
|---|---|---|---|
| const uint16_t | colKeyOffsetIndex2 | ||
| ) |
Compares the two values stored at the offsets located by the two indices.
The implementation uses type information saved in colTupleDesc when performing the comparison.
Parameters:
| [in] | colKeyOffsetIndex1 | index into the offset of the first value |
|---|---|---|
| [in] | colKeyOffsetIndex2 | index into the offset of the second value |
Returns:
true if value at offset located at colKeyOffsetIndex1 is less than value at offset loocated at colKeyOffsetIndex2
Definition at line 588 of file LcsHash.cpp.
References attrAccessor, clusterBlockWriter, colTuple1, colTuple2, colTupleDesc, columnId, TupleDescriptor::compareTuples(), hashTable, UnalignedAttributeAccessor::loadValue(), TupleDataWithBuffer::resetBuffer(), LcsHashTable::valueNodes, and LcsHashValueNode::valueOffset.
Member Data Documentation
The documentation for this class was generated from the following files:
- /home/pub/open/dev/fennel/lucidera/colstore/LcsHash.h
- /home/pub/open/dev/fennel/lucidera/colstore/LcsHash.cpp
Generated on Mon Jun 22 04:00:37 2009 for Fennel by 
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