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
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/92af9143f13df8c54362ebbd4397cb53f207ff2d
Modified Files
--------------
src/backend/commands/copy.c | 6 ++++++
src/backend/parser/parse_cte.c | 7 +++++++
src/test/regress/expected/merge.out | 14 ++++++++++++++
src/test/regress/sql/merge.sql | 10 ++++++++++
4 files changed, 37 insertions(+)