Map tables have been significantly revamped in version 15 to allow for a dynamic number of columns as well as more powerful querying options. The main benefit to multi-column map tables is the ability to match multiple values at once. For example, you may want to match a value in column 1 and a value in column 2 (or a value in column 3). New functions have been added to custom code which will allow you to directly query the underlying DataTable object using SQL syntax or LINQ.
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