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HBase >> mail # user >> How HBase perform per-column scan?

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How HBase perform per-column scan?
Hi, All,
I want to find all existing values for a given column in a HBase, and would
that result in a full-table scan in HBase? For example, given a column C,
the table is of very large number of rows, from which few rows (say only 1
row) have non-empty values for column C. Would HBase still ues a full table
scan to find this row? Or HBase has any optimization work for this kind of