Parameters and filters (what a date widget actually does)

A date widget linked to a bar chart typically injects start/end into the WHERE clause of the dataset query. It is not merely an x-axis range label, and it is not automatically a global filter for every widget unless you configured it that way.

Define, bind, and test parameters: wrong grain + parameter still returns a pretty wrong chart.

Global filters apply to widgets that share the field. Cross-filtering (click a mark) is interactive BI, not a separate product.

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