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ee3ef4af19
This field is not used directly in the code, but it is important for
query jumbling to be able to make a difference between a named
DEALLOCATE and DEALLOCATE ALL (see bb45156f34). This behavior is
tracked in the regression tests of pg_stat_statements, but the reason
why this field is important can be easily missed, as a recent discussion
has proved, so let's improve its comment to document the reason why it
needs to be around.
Wording has been suggested by Tom Lane
Discussion: https://postgr.es/m/Zih1ATt37YFda8_p@paquier.xyz