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SQL: [Docs] Add limitation for sorting on aggs #52210

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matriv merged 5 commits into from
Feb 12, 2020
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SQL: [Docs] Add limitation for sorting on aggs #52210

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SQL: [Docs] Add limitation for sorting on aggs
matriv Feb 11, 2020
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Merge remote-tracking branch 'upstream/master' into fix-52204
matriv Feb 11, 2020
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fix limitation
matriv Feb 11, 2020
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gender -> age
matriv Feb 11, 2020
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address comments
matriv Feb 12, 2020
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11 changes: 11 additions & 0 deletions docs/reference/sql/limitations.asciidoc
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Expand Up @@ -118,6 +118,17 @@ SELECT * FROM test GROUP BY age ORDER BY COUNT(*) LIMIT 100;
It is possible to run the same queries without a `LIMIT` however in that case if the maximum size (*10000*) is passed,
an exception will be returned as {es-sql} is unable to track (and sort) all the results returned.

Moreover, the aggregation(s) used in the `ORDER BY`, must be only plain aggregate functions. No scalar
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@bpintea bpintea Feb 12, 2020

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"must be only plain aggregate functions" could be rephrased to "can only be ..."

functions or operators can be used, and therefore no complex columns that combine two ore more aggregate
functions can be used for ordering. Here are some examples of queries that are *not allowed*:

[source, sql]
--------------------------------------------------
SELECT age, ROUND(AVG(salary)) AS avg FROM test GROUP BY age ORDER BY avg;

SELECT age, MAX(salary) - MIN(salary) AS diff FROM test GROUP BY age ORDER BY diff;
--------------------------------------------------

[float]
=== Using aggregation functions on top of scalar functions

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