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Plumbs through a new parameter for the cardinality aggregation, to allow configuring the execution mode. This can have significant impacts on speed and memory usage. This PR exposes three collection modes and two heuristics that we can tune going forward. All of these are treated as hints and can be silently ignored, e.g. if not applicable to the given field type. I've change the default behavior to optimize for time, which potentially uses more memory. Users can override this for the old behavior if needed. |
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