On Thu, Mar 20, 2014 at 8:51 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Atri Sharma <atri.jiit@gmail.com> writes: > Now, why cannot we take the estimate of all the buckets behind the bucket > in which our value is present? Will that estimate not give us the fraction > of tuples that are expected to be before the first matching row?
Uh, no, not unless you assume that the table happens to be perfectly sorted by the column's value.
Yes, that is true. So, if an attribute has an index present, can we do this somehow?
