Custom Aggregate Causing Issues Sometimes

  • Good to know, you're welcome. Thanks for posting back that you found a path forward!

    There are no special teachers of virtue, because virtue is taught by the whole community.
    --Plato

  • Long time ago.... but what the hec,

    Had same problem on one our 2008 R2 Servers

    Setting Max Degree of Parallelism to 1 resolved it.

    I am assuming it has something to do with the way the optimizer works with parallel queries (such as a union)

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