sankey()

`sankey()`

A companion function Sankey Widget that produces data compatible with the widget.

Parameter	Type	Required	Default	Description
`source`	string	required		The field containing the source node ID.
`target`	string	required		The field containing the target node ID.
`weight`	Aggregate	optional^[a]	`count(as=_count)`	A function used to calculate the weight the edges. Good candidates are functions like e.g. `sum()`, `count()` or `max()`.
^[a]Optional parameters use their default value unless explicitly set

For a webserver log, show which URLs match HTTP methods

logscale

#type=accesslog
| sankey(source=method, target=url)

For a webserver log, show referrers by URL

logscale

#type=accesslog referrer!="-"
| sankey(source=referrer, target=url)