Issue with Query Involving Temporal Attribute about nl4dv

[arpitnarechania]

Related open issues in Vega-Lite: #3958, #1541.

To achieve the desired functionality, need to parse the date string and pass an object with year, month explicitly. For example:

{ "$schema": "https://vega.github.io/schema/vega-lite/v4.json", "mark": { "type": "line", "tooltip": true }, "encoding": { "y": { "field": "Production Budget", "type": "quantitative", "aggregate": "mean", "axis": { "format": "s" } }, "x": { "field": "Release Year", "type": "temporal" } }, "transform": [ { "filter": { "field": "Release Year", "range": [ {"year": 2006}, {"year": 2009} ] } } ], "data": { "url": "https://raw.githubusercontent.com/nl4dv/nl4dv/master/examples/assets/data/movies-w-year.csv", "format": { "type": "csv" } } }

This will require writing a date parser utility that also prepares the desired datetime object needed by above.