Interface MatrixSketch<T>
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- All Known Implementing Classes:
KMVSketch
public interface MatrixSketch<T>
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description CorrMatrixBlockcreate(MatrixBlock blkIn)Create a initial sketch of a given block.MatrixBlockgetMatrixValue(CorrMatrixBlock blkIn)Obtain matrix distinct count value from estimation Used for estimating distinct in rows or columns.TgetScalarValue(MatrixBlock blkIn)Get scalar distinct count from a input matrix block.CorrMatrixBlockintersection(CorrMatrixBlock arg0, CorrMatrixBlock arg1)Intersect two sketchesCorrMatrixBlockunion(CorrMatrixBlock arg0, CorrMatrixBlock arg1)Union two sketches together to from a combined sketch.
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Method Detail
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getScalarValue
T getScalarValue(MatrixBlock blkIn)
Get scalar distinct count from a input matrix block.- Parameters:
blkIn- A input block to estimate the number of distinct values in- Returns:
- The distinct count estimate
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getMatrixValue
MatrixBlock getMatrixValue(CorrMatrixBlock blkIn)
Obtain matrix distinct count value from estimation Used for estimating distinct in rows or columns.- Parameters:
blkIn- The sketch block to extract the count from- Returns:
- The result matrix block
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create
CorrMatrixBlock create(MatrixBlock blkIn)
Create a initial sketch of a given block.- Parameters:
blkIn- A block to process- Returns:
- A sketch
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union
CorrMatrixBlock union(CorrMatrixBlock arg0, CorrMatrixBlock arg1)
Union two sketches together to from a combined sketch.- Parameters:
arg0- Sketch onearg1- Sketch two- Returns:
- The combined sketch
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intersection
CorrMatrixBlock intersection(CorrMatrixBlock arg0, CorrMatrixBlock arg1)
Intersect two sketches- Parameters:
arg0- Sketch onearg1- Sketch two- Returns:
- The intersected sketch
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