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* HLL lgK and a tip Knowledge transfer from https://the-asf.slack.com/archives/CJ8D1JTB8/p1600699967024200. Attempted to make a connection between the SQL HLL function and the HLL underneath without getting too complicated. Also added a note about using K over 16 being pretty much pointless. * Corrected spelling * Create datasketches-hll.md Put roll-up back to rollup * Update docs/development/extensions-core/datasketches-hll.md Co-authored-by: Abhishek Agarwal <1477457+abhishekagarwal87@users.noreply.github.com> Co-authored-by: Abhishek Agarwal <1477457+abhishekagarwal87@users.noreply.github.com>