fix: render altair layered charts (dedupe selection params) #927
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This fixes a bug, but also uncovers another bug that is not fixed.
This fixes rendering layered charts with multiple selection. If there are multiple layers with multiple point selections, we would give the params the same name which would cause errors. We now dedupe them
This also uncovers that we don't support selection in
timeUnit
aggregations. so doingmonth(date)
makes it hard for us to back into filter the date by a month. This is becausemonth(date)
is an binning function that altair performs on the frontend. but the backend does the filtering and does not have this transformation.