Horton

Reject MERGE in CTEs and COPY

Alvaro Herrera <alvherre@alvh.no-ip.org>

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Commit: 455d254d22665eb7af3b714435f3fecc63696cc7
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2022-08-12T10:05:50Z
Releases: 15.0 
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

Files

PathChange+/−
src/backend/commands/copy.c modified +6 −0
src/backend/parser/parse_cte.c modified +7 −0
src/test/regress/expected/merge.out modified +14 −0
src/test/regress/sql/merge.sql modified +10 −0

Discussion