This implements `INLINESTATS`. Most of the heavy lifting is done by
`LOOKUP`, with this change mostly adding a new abstraction to logical
plans, and interface I'm calling `Phased`. Implementing this interface
allows a logical plan node to cut the query into phases. `INLINESTATS`
implements it by asking for a "first phase" that's the same query, up to
`INLINESTATS`, but with `INLINESTATS` replaced with `STATS`. The next
phase replaces the `INLINESTATS` with a `LOOKUP` on the results of the
first phase.
So, this query:
```
FROM foo
| EVAL bar = a * b
| INLINESTATS m = MAX(bar) BY b
| WHERE m = bar
| LIMIT 1
```
gets split into
```
FROM foo
| EVAL bar = a * b
| STATS m = MAX(bar) BY b
```
followed by
```
FROM foo
| EVAL bar = a * b
| LOOKUP (results of m = MAX(bar) BY b) ON b
| WHERE m = bar
| LIMIT 1
```
* Enforce an invariant in our dependency checker so that logical plans never have duplicate output attribute names or ids.
* Fix ROW to not produce columns with duplicate names.
* Fix ResolveUnionTypes to not create multiple synthetic field attributes for the same union type.
* Add tests for commands using the same column name more than once.
* Update docs w.r.t. how commands behave if they are used with duplicate column names.
This copies the first line of the description of each command to just
under the syntax so that it's "in order", before the `Parameters`
section. That way if you are reading from top to bottom you see:
```
syntax
short description
parameter names and descriptions
long description
examples
```
I've also removed the `Description` section entirely if the description
was just one sentence. So in some cases that just isn't `long
description`.
This moves examples from files marked to run in integration tests only
to the files where they belong and disables this pattern matching. We
now use supported features.
This adds some docs to the top of `docs.csv-spec` and
`docs-IT_tests_only.csv-spec` telling folks not to add more stuff there
and instead put new examples into whatever files they line up with. It
also shifts some things out of the file to "prime the pump" on cleaning
it up.
* Document nested expressions for stats
* More docs
* Apply suggestions from review
- count-distinct.asciidoc
- Content restructured, moving the section about approximate counts to end of doc.
- count.asciidoc
- Clarified that omitting the `expression` parameter in `COUNT` is equivalent to `COUNT(*)`, which counts the number of rows.
- percentile.asciidoc
- Moved the note about `PERCENTILE` being approximate and non-deterministic to end of doc.
- stats.asciidoc
- Clarified the `STATS` command
- Added a note indicating that individual `null` values are skipped during aggregation
* Comment out mentioning a buggy behavior
* Update sum with inline function example, update test file
* Fix typo
* Delete line
* Simplify wording
* Fix conflict fix typo
---------
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
* Break out 'Limitations' into separate page
* Add REST API docs
* Restructure commands, functions, and operators refs
* Add placeholder for getting started guide
* Group 'Syntax', 'Metafields', and 'MV fields' under 'Language'
* Add placeholder for Kibana page
* Add link from landing page
* Apply uniform formatting to ACOS, CASE, and DATE_PARSE function refs
* Reword default LIMIT
* Add support for COUNT(*)
* Move 'Commands' and 'Functions and operators' to individual pages
---------
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
This adds docs for all of ESQL's aggregation functions. Hopefully from
here on out we can add the docs as we add new functions.
I've created a few tagged regions in the aggs docs themselves so we can
include them into the ESQL docs.
---------
Co-authored-by: Abdon Pijpelink <abdon.pijpelink@elastic.co>
