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Add summarize docs for "by" without an aggregate function #5216

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Aug 16, 2024
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Add summarize docs for "by" without an aggregate function #5216

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84c73b8
Add summarize docs for "by" without an aggregate function
philrz Aug 12, 2024
a20e91b
Break out synopsis to more lines
philrz Aug 13, 2024
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30 changes: 25 additions & 5 deletions docs/language/operators/summarize.md
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Original file line number Diff line number Diff line change
Expand Up @@ -5,14 +5,23 @@
### Synopsis

```
[summarize] [<field>:=]<agg> [where <expr>][, [<field>:=]<agg> [where <expr>] ...] [by [<field>][:=<expr>] ...]
[summarize] [<field>:=]<agg>
[summarize] [<field>:=]<agg> [where <expr>][, [<field>:=]<agg> [where <expr>] ...]
[summarize] [<field>:=]<agg> [by [<field>][:=<expr>][, [<field>][:=<expr>]] ...]
[summarize] [<field>:=]<agg> [where <expr>][, [<field>:=]<agg> [where <expr>] ...] [by [<field>][:=<expr>][, [<field>][:=<expr>]] ...]
[summarize] by [<field>][:=<expr>][, [<field>][:=<expr>] ...]
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After seeing the first iteration of this PR, @nwt correctly pointed out that the expanded/corrected original synopsis line was way too long and complex. His first thought on how to improve it was to break it out into more lines, so that's what I've done on this next iteration and indeed I'm liking it more. I like leading with the shorter one that represents a very common use, then builds up to the full/beastly one, so if a user is learning incrementally hopefully they'll get the idea.

```
### Description

The `summarize` operator consumes all of its input, applies an [aggregate function](../aggregates/README.md)
to each input value optionally organized with the group-by keys specified after
the `by` keyword, and at the end of input produces one or more aggregations
for each unique set of group-by key values.
In the first four forms, the `summarize` operator consumes all of its input,
applies an [aggregate function](../aggregates/README.md) to each input value
optionally filtered by a `where` clause and/or organized with the group-by
keys specified after the `by` keyword, and at the end of input produces one
or more aggregations for each unique set of group-by key values.

In the final form, `summarize` consumes all of its input, then outputs each
unique combination of values of the group-by keys specified after the `by`
keyword.

The `summarize` keyword is optional since it is an
[implied operator](../dataflow-model.md#implied-operators).
Expand Down Expand Up @@ -102,3 +111,14 @@ echo '{k:"foo",v:1}{k:"bar",v:2}{k:"foo",v:3}{k:"baz",v:4}' | zq -z 'set:=union(
{key:"baz",set:|[4]|}
{key:"foo",set:|[3]|}
```

Output just the unique key values:
```mdtest-command
echo '{k:"foo",v:1}{k:"bar",v:2}{k:"foo",v:3}{k:"baz",v:4}' | zq -z 'by k' - | sort
```
=>
```mdtest-output
{k:"bar"}
{k:"baz"}
{k:"foo"}
```