I have three different data sources that all have a date column. I want to use a dropdown control to filter all of my charts at the same time. I can't use Looker's built-in date control because I want to filter on month only and don't want users to be able to freely select days or go outside of the available month range. If I use the date from any if the data sources in my control, it's only going to filter the charts that belong to that one data source. So the only thing that seems to work is using Looker's built-in date control but that is causing mass confusion and frustration for users.
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