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MDEV-22401: Optimizer trace: multi-component range is not printed cor…
…rectly KEY_MULTI_RANGE::range_flag does not have correct flag bits for per-endpoint flags (NEAR_MIN, NEAR_MAX, NO_MIN_RANGE, NO_MAX_RANGE). It only has bits for flags that describe both endpoints. So - Document this. - Switch optimizer trace to using {start|end}_key.flag values, instead. This fixes the bug. - Switch records_in_column_ranges() to doing that too. (This used to work, because KEY_MULTI_RANGE::range_flag had correct flag value for the last key component, and EITS only uses one-component pseudo-indexes)
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