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#11134) A multi-rolling-measure query reads the rollup through a `SELECT DISTINCT dim` key-generator over the time series — a grouped Aggregate with no aggregate expressions. The rolling optimizer matched its shape and rewrote it into a RollingWindowAggregate with an empty `rolling_aggs` list. Its executor builds the per-bucket `had_values` mask only inside the rolling-aggregate loop, so an empty list leaves the mask empty and the output loop then indexes out of bounds: a panic on the current build, surfacing as "Sort expressions cannot be empty for streaming merge" on the DataFusion 46 executor. Bail out of the rewrite when there are no rolling aggregates. The node runs as a plain aggregate/range-join instead, producing the same dimension keys.
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