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[BACKPORT] Avoid potentially expensive
len()
call in value index es…
…timation. backport: 3770bc9 Avoid potentially expensive `len()` call in value index estimation. Instead iterate over unique values and break if we can get more than `MAX_DISTINCT_VALUES` values. Also correctly identify empty indexes like the DateRangeIndex, which only returns values when the name argument is provided to the uniqueValues method with either the `since` or `until` field.
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