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Posted to commits@pinot.apache.org by ja...@apache.org on 2019/05/28 22:28:02 UTC
[incubator-pinot] branch fasthll_doc created (now f51b5d8)
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jackie pushed a change to branch fasthll_doc
in repository https://gitbox.apache.org/repos/asf/incubator-pinot.git.
at f51b5d8 Update the documentation for FASTHLL
This branch includes the following new commits:
new f51b5d8 Update the documentation for FASTHLL
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[incubator-pinot] 01/01: Update the documentation for FASTHLL
Posted by ja...@apache.org.
This is an automated email from the ASF dual-hosted git repository.
jackie pushed a commit to branch fasthll_doc
in repository https://gitbox.apache.org/repos/asf/incubator-pinot.git
commit f51b5d89ca30d2219fd36289ada312bbb3401801
Author: Jackie (Xiaotian) Jiang <xa...@linkedin.com>
AuthorDate: Tue May 28 15:26:22 2019 -0700
Update the documentation for FASTHLL
For serialized HyperLogLog, FASTHLL performs worse than DISTINCTCOUNTHLL, which is counter-intuitive.
Update the documentation for that, and will deprecate FASTHLL and FASTHLLMV in the future.
---
docs/pql_examples.rst | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/docs/pql_examples.rst b/docs/pql_examples.rst
index ef69609..17f0359 100644
--- a/docs/pql_examples.rst
+++ b/docs/pql_examples.rst
@@ -148,7 +148,8 @@ Supported aggregations on single-value columns
* ``MINMAXRANGE``
* ``DISTINCTCOUNT``
* ``DISTINCTCOUNTHLL``
-* ``FASTHLL``
+* ``FASTHLL`` (**WARN**: will be deprecated soon. ``FASTHLL`` stores serialized HyperLogLog in String format, which performs
+ worse than ``DISTINCTCOUNTHLL``, which supports serialized HyperLogLog in BYTES (byte array) format)
* ``PERCENTILE[0-100]``: e.g. ``PERCENTILE5``, ``PERCENTILE50``, ``PERCENTILE99``, etc.
* ``PERCENTILEEST[0-100]``: e.g. ``PERCENTILEEST5``, ``PERCENTILEEST50``, ``PERCENTILEEST99``, etc.
@@ -163,7 +164,8 @@ Supported aggregations on multi-value columns
* ``MINMAXRANGEMV``
* ``DISTINCTCOUNTMV``
* ``DISTINCTCOUNTHLLMV``
-* ``FASTHLLMV``
+* ``FASTHLLMV`` (**WARN**: will be deprecated soon. It does not make lots of sense to configure serialized HyperLogLog
+ column as a dimension)
* ``PERCENTILE[0-100]MV``: e.g. ``PERCENTILE5MV``, ``PERCENTILE50MV``, ``PERCENTILE99MV``, etc.
* ``PERCENTILEEST[0-100]MV``: e.g. ``PERCENTILEEST5MV``, ``PERCENTILEEST50MV``, ``PERCENTILEEST99MV``, etc.
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