citusdata / citusdata/postgresql-hll

Setting regwidth >= 6 results in cardinality computed to NaN

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Description

Setting it to 5 works just fine, but setting it to 6 (Regardless log2m selected) always results in NaN.

Pulled the code locally to test the implementation against our implementation of HLL, and I noticed that issue. It's really hll.c with PG callback/integration bits removed.

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