prql

[mbostock]

Fixes #1075.

Doesn’t work with interpolated expressions, e.g.,

from gaia
filter phot_g_mean_mag < ${min}
sort {phot_g_mean_mag}
take 10

I’m not sure how we’d implement that… we’d need some way to represent placeholder values (such as ?) that are appropriately substituted during the transformation. PRQL does appear to support parameters so we should be able to use that: https://prql-lang.org/book/reference/syntax/parameters.html.

I’m also not sure if we also want to support a prql tagged template literal, since that would mean loading npm:prql-js in the browser (importing it dynamically, presumably?).

[srenatus]

Just so you're aware -- with the next release, importing prql-js might change? I've been pursuing prql in observable-framework myself here, and that change -- switching the browser build to ESM module, hasn't been part of a release yet AFAICT.

[mbostock]

That’s great to hear @srenatus. An ESM distribution would be welcome.