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Posted to commits@datasketches.apache.org by GitBox <gi...@apache.org> on 2020/02/14 01:31:38 UTC
[GitHub] [incubator-datasketches-java] jdob2 opened a new issue #301: Does
Union support multi Sketch flavor updates?
jdob2 opened a new issue #301: Does Union support multi Sketch flavor updates?
URL: https://github.com/apache/incubator-datasketches-java/issues/301
I am trying to understand why the following code doesn't work as intended
` Union set1 = Union.builder().setNominalEntries(SKETCH_LOG_ENTRY).buildUnion();
set1.update(1);
set1.update(2);
set1.update(3);
set1.update(4);
set1.update(5);
set1.update(6);
set1.update(6);
set1.update(6);
Union set2 = Union.builder().setNominalEntries(SKETCH_LOG_ENTRY).buildUnion();
set2.update(1);
AnotB aNotB = Sketches.setOperationBuilder().setNominalEntries(SKETCH_LOG_ENTRY).buildANotB();
aNotB.update(set1.getResult(), set2.getResult());
System.out.println(aNotB.getResult().getEstimate());
Union finalUnion = Union.builder().setNominalEntries(SKETCH_LOG_ENTRY).buildUnion();
finalUnion.update(aNotB.getResult());
System.out.println(finalUnion.getResult().getEstimate());`
I am expecting the printout to be
`5.0`
`5.0`
but instead I get
`5.0`
`1.0`
I must be doing something trivially wrong, or does Union update only support compactSketch from Union?
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[GitHub] [incubator-datasketches-java] jdob2 closed issue #301: Does Union
support multi Sketch flavor updates?
Posted by GitBox <gi...@apache.org>.
jdob2 closed issue #301: Does Union support multi Sketch flavor updates?
URL: https://github.com/apache/incubator-datasketches-java/issues/301
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[GitHub] [incubator-datasketches-java] jdob2 commented on issue #301: Does
Union support multi Sketch flavor updates?
Posted by GitBox <gi...@apache.org>.
jdob2 commented on issue #301: Does Union support multi Sketch flavor updates?
URL: https://github.com/apache/incubator-datasketches-java/issues/301#issuecomment-586448104
Ah, you are absolutely correct, that make alot of sense, thanks
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[GitHub] [incubator-datasketches-java] leerho commented on issue #301: Does
Union support multi Sketch flavor updates?
Posted by GitBox <gi...@apache.org>.
leerho commented on issue #301: Does Union support multi Sketch flavor updates?
URL: https://github.com/apache/incubator-datasketches-java/issues/301#issuecomment-586066714
As stated in the [documentation](https://datasketches.apache.org/api/java/snapshot/apidocs/index.html), the AnotB operation is not iterative like Intersection and Union. It is a stateless function that resets after the getResult. So your second call to aNotB returns 0. So instead of your code try this:
```
AnotB aNotB = SetOperationBuilder.buildAnotB();
aNotB.update(SketchA, SketchB); //Called only once.
CompactSketch result = aNotB.getResult();
System.out.println(result.getEstimate());
Union finalUnion = Union.builder().setNominalEntries(4096).buildUnion();
finalUnion.update(result);
System.out.println(finalUnion.getResult().getEstimate());
```
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[GitHub] [incubator-datasketches-java] leerho commented on issue #301: Does
Union support multi Sketch flavor updates?
Posted by GitBox <gi...@apache.org>.
leerho commented on issue #301: Does Union support multi Sketch flavor updates?
URL: https://github.com/apache/incubator-datasketches-java/issues/301#issuecomment-586069662
You can also do this:
```
AnotB aNotB = SetOperationBuilder.buildAnotB();
CompactSketch result = aNotB.aNotB(SketchA, SketchB);
System.out.println(result.getEstimate());
...
```
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