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Data & Analytics · Advanced

Context Transition

The DAX behavior in which CALCULATE, or a measure reference, converts the current row context into an equivalent filter context.

Definition

Context transition is why referencing a measure inside SUMX or a calculated column filters by the current row. It can be expensive on large tables and produces surprises when rows are not unique.

Exam tip

Measures referenced inside iterators always trigger context transition, because they are wrapped in an implicit CALCULATE.

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