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Counting cardinality estimations may become negative #3

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KMax opened this issue Mar 4, 2019 · 1 comment
Open

Counting cardinality estimations may become negative #3

KMax opened this issue Mar 4, 2019 · 1 comment
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bug Something isn't working
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v0.0.1

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KMax commented Mar 4, 2019

The card(c), card(p) and card(p, o) may be below zero, which is wrong. Maybe fixed by using the conditional UPDATE which would check if the counter is not less than the decrement.
@KMax KMax added the bug Something isn't working label Mar 4, 2019
@KMax KMax added this to the v0.0.1 milestone Mar 4, 2019
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KMax commented Mar 13, 2019 •
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INSERT ... IF NOT EXISTS employs the lightweight transactions mechanism which isn't supported by ScyllaDB yet (see scylladb/scylladb#1359). And lightweight transactions introduce a significant overhead which may be undesirable.

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