© Philip Seamark, Thomas Martens 2019Philip Seamark and Thomas MartensPro DAX with Power BIhttps://doi.org/10.1007/978-1-4842-4897-3_3
A handy concept to learn when working with DAX calculations is the concept of lineage. DAX lineage refers to the ability to trace the heritage of data in table expressions back to original physical tables. When new table expressions get built by various DAX functions, the columns in the new table may contain a reference back to the original physical table from which it was initially derived.
Lineage information can also get used by the DAX query engine to help decide what the most optimal approach ...