angle-grinder
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Split out `Expressions` section of `README`
There are currently several places in the language where we accept arbitrary expressions:
- In the clause of
where - In the argument of aggregates (
sum(xyz)), - In the group-by clause of aggregates (
* | count by status_code > 500, response_ms < 300, url)
The set of arbitrary expressions that can be constructed is growing, and it'd be great to have those documented separately where they could be linked to within the README so people could have a full understanding of what they could use.