expressionContainsAggregation

True when the expression text contains an aggregation — a brace call (SUM{...}, custom aggregations included) or one of the paren-form aggregation wrappers (PERCENTAGE(...), CUMUL(...), …). Observable brace calls (CHANGE_COUNT{...}) are not aggregations: the check runs on the normalized program, where the parser's generic brace-call kind has been split into AGG_CALL / OBSERVABLE_CALL. Empty or unparseable text → false.

expressionContainsAggregation: (expression: string | undefined | null, options?: InferExpressionKindOptions) => boolean