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Posted to issues@beam.apache.org by "Brachi Packter (Jira)" <ji...@apache.org> on 2021/05/24 19:33:00 UTC

[jira] [Created] (BEAM-12393) Beam SQL support for HLL count

Brachi Packter created BEAM-12393:
-------------------------------------

             Summary: Beam SQL support for HLL count
                 Key: BEAM-12393
                 URL: https://issues.apache.org/jira/browse/BEAM-12393
             Project: Beam
          Issue Type: Improvement
          Components: extensions-java-sketching
            Reporter: Brachi Packter


There is support for HLL sketch in Ptransform:

 
{code:java}
p.apply("Int", Create.of(ints)).apply("IntHLL", ApproximateCountDistinct.globally()
.withPercision(PRECISION));{code}
 

or 

 
{code:java}
PCollection<KV<Integer, Long>> result =
p.apply("Long", Create.of(longs)).apply("LongHLL", ApproximateCountDistinct.perKey());
 
{code}
But, no support for beam sql. 
We can't initiate it to be used  in SqlTransform (even the combiner: HllCountMergePartialFn exists)

 



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