refactor scale -- remove multi-level condition operator.  (It's impossible to add breakpoint to debug)
refactor scale -- remove multi-level condition operator.  (It's impossible to add breakpoint to debug)

uwdata/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite