What are the different types of filter and how do they differ?
There are 3 groups of filters in AdaptableBlotter.JS:
System Filters - these are filters which the Adaptable Blotter ships and provides an evaluation for (e.g. Tomorrow for date columns). You can choose which, if any, System Filters you want available and can rely on the Adaptable Blotter to match rows.
Column Filters - these are the filters that you create when you filter a column level. They are transient in the sense that you cannot save them (although any Column Filters applied when the grid shuts down will be reapplied on restart). If you want to re-use a Column Filter then you will need to save it (and name it) as a User Filter.
User Filters - these are filters that operate on one column only that you can name and save for re-use (both as column filters and throughout the grid).
Can a User Filter include more than one column?
No. A User Filter references just one column so that it can then be re-used in other queries and made available in the Column Filter dropdown. You can create multi-column queries but they are Advanced Searches.
Can we ship with our own User Filters?
Yes you can. If they are simple expressions then it is straightforward. You can also create dynamic User Filters which contain a predicate that is evaluated at runtime.
Can I save a Column Filter?
Yes, but as a User Filter. Column Filters are designed to be transient. If you want to re-use one in other queries then make it a column filter (there are plenty of ways to do that).