When your expression returns a numeric, Boolean or String result, you have to define the type of the column into which this results will be stored and the name of this column. If your expression returns a geometry, you can either process it as a geometry, and replace the original geometry; or store it as a String into a novel column.
Examples of queries:
Note that the units used in the query depend on the Coordinate Reference System.
The actual processing is done by the awesome geotools library.
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