FileAttachment.arquero

[mbostock]

Ref. #1506 (review)

[Fil]

A question would be, should the .arquero method also work on a JSON or CSV file (or even a "fixed" file, for aq.loadFixed)?

[mbostock]

Okay, I added support for CSV, TSV, and JSON.

[Fil]

I've added a bit of documentation.

I this this raises another question: if we want to generalize this approach, shouldn't we have a duckdb method as well, e.g. FileAttachment("data.csv").duckdb()?

[mbostock]

We certainly could add a DuckDB method, but I don’t think that should block this PR, and I think it makes slightly less sense in the DuckDB case because typically a database has multiple tables and so you don’t want to give the file attachment primacy (i.e., it’s better to use DuckDBClient.of to accommodate multiple tables than FileAttachment.duckdb which is limited to a single table).

[mbostock]

Added support for Apache Parquet files (and preloading which is a bit tricky because we only need to additionally preload parquet-wasm when using an Apache Parquet file with Arquero). Made the Arquero loader detection a bit more robust considering the file extension when the MIME type isn’t sufficient. Also tweaked the documentation a bit.

PTAL @Fil thank you!