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The following commit(s) were added to refs/heads/master by this push:
new 22b56ed Update the documentation for FASTHLL (#4251)
22b56ed is described below
commit 22b56edc6cc17220a18675cc077e374bbabd8575
Author: Xiaotian (Jackie) Jiang <[email protected]>
AuthorDate: Fri May 31 15:38:15 2019 -0700
Update the documentation for FASTHLL (#4251)
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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