Refactor query latch#155881
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Removed unnecessary mutex for cycle errors
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cc @Zoxc |
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This PR removes unnecessary mutex for cycle errors. This is revival of #153779. Previously we could have to stored a cycle error per each query waiter in the cycle thus requiring a mutex for cycle error in each query waiter. However as #154973 has been merged query cycles break only on a single query so that
QueryLatchcan contain a singleOption<Cycle>field.r? @nnethercote