Thomas Mayer writes:
> To implement the optimization, subquery_is_pushdown_safe() needs to
> return true if pushing down the quals to a subquery which has window
> functions is in fact safe ("quals that only reference subquery
> outputs that are listed in the PARTITION clauses of all window func
Am 03.01.2014 15:54, schrieb Tom Lane:
Thomas Mayer writes:
To implement the optimization, subquery_is_pushdown_safe() needs to
return true if pushing down the quals to a subquery which has window
functions is in fact safe ("quals that only reference subquery
outputs that are listed in the PA
Thomas Mayer writes:
> ... "mark" ...: Do I understand you correctly, that you prefer doing the
> decision elsewhere and store the result (safe/unsafe) boolean value
> besides to the subquery output fields? For the push-down, a subquery
> output field must be available anyways.
See check_outpu
Am 03.01.2014 19:04, schrieb Tom Lane:
I think you need to read the code around subquery_is_pushdown_safe and
qual_is_pushdown_safe some more.
regards, tom lane
.
In general, I'd need to go throught the pg source code which will take
some time. For instance, I wanted
