Adds COMPACT_COUNT_DISTINCT SQL function to 8.4.x #1
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Backports https://github.com/mode/voltdb/tree/roaring-count-distinct to VoltDB 8.4.x.
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Backports https://github.com/mode/voltdb/tree/roaring-count-distinct to VoltDB 8.4.x.
This is faster and more efficient than
SELECT COUNT(DISTINCT column_name) FROM table_namewhile being more accurate and working for more column types thanSELECT APPROX_COUNT_DISTINCT(column_name) FROM table_name.