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postgres/src/backend/commands
Alvaro Herrera 455d254d22 Reject MERGE in CTEs and COPY
The grammar added for MERGE inadvertently made it accepted syntax in
places that were not prepared to deal with it -- namely COPY and inside
CTEs, but invoking these things with MERGE currently causes assertion
failures or weird misbehavior in non-assertion builds.  Protect those
places by checking for it explicitly until somebody decides to implement
it.

Reported-by: Alexey Borzov <borz_off@cs.msu.su>
Discussion: https://postgr.es/m/17579-82482cd7b267b862@postgresql.org
2022-08-12 12:05:50 +02:00
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