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Implement the use of scalar functions inside aggregate functions.
This allows for complex expressions inside aggregations, with or without
GROUBY as well as with or without a HAVING clause. e.g.:
```
SELECT MAX(CASE WHEN a IS NULL then -1 ELSE abs(a * 10) + 1 END) AS max, b
FROM test
GROUP BY b
HAVING MAX(CASE WHEN a IS NULL then -1 ELSE abs(a * 10) + 1 END) > 5
```
Scalar functions are still not allowed for `KURTOSIS` and `SKEWNESS` as
this is currently not implemented on the ElasticSearch side.
Fixes: #29980
Fixes: #36865
Fixes: #37271
(cherry picked from commit
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appendix | ||
endpoints | ||
functions | ||
language | ||
concepts.asciidoc | ||
getting-started.asciidoc | ||
index.asciidoc | ||
limitations.asciidoc | ||
overview.asciidoc | ||
security.asciidoc |