Gabor Kaszab created IMPALA-10045:
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Summary: Document ds_hll_* functions
Key: IMPALA-10045
URL: https://issues.apache.org/jira/browse/IMPALA-10045
Project: IMPALA
Issue Type: New Feature
Components: Docs
Affects Versions: Impala 4.0
Reporter: Gabor Kaszab
There were some new functions added recently to add support for Apache
DataSketches HLL calculations. These functions purpose is to give an
approximate answer for count(distinct) kind of queries.
The newly introduced functions are:
ds_hll_sketch()
ds_hll_estimate()
ds_hll_union()
Related Jiras:
https://issues.apache.org/jira/browse/IMPALA-9632
https://issues.apache.org/jira/browse/IMPALA-9633
We should document these and mark them as experimental features so that users
can try out and hopefully give feedback.
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