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ha_innodb::records_in_range uses btr_estimate_n_rows_in_range to estimate
the selectivity of a predicate for an index. btr_estimate_n_rows_in_range
scans the root block of the index to estimate the value.

Are these estimates less accurate immediately after a split of the root
block? There will be few keys in the root block after it has been split.

Mark Callaghan
mcallaghan (AT) google (DOT) com

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