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David Rowley ed934d4fa3 Allow estimate_num_groups() to pass back further details about the estimation ... Here we add a new output parameter to estimate_num_groups() to allow it to inform the caller of additional, possibly useful information about the estimation. The new output parameter is a struct that currently contains just a single field with a set of flags. This was done rather than having the flags as an output parameter to allow future fields to be added without having to change the signature of the function at a later date when we want to pass back further information that might not be suitable to store in the flags field. It seems reasonable that one day in the future that the planner would want to know more about the estimation. For example, how many individual sets of statistics was the estimation generated from? The planner may want to take that into account if we ever want to consider risks as well as costs when generating plans. For now, there's only 1 flag we set in the flags field. This is to indicate if the estimation fell back on using the hard-coded constants in any part of the estimation. Callers may like to change their behavior if this is set, and this gives them the ability to do so. Callers may pass the flag pointer as NULL if they have no interest in obtaining any additional information about the estimate. We're not adding any actual usages of these flags here. Some follow-up commits will make use of this feature. Additionally, we're also not making any changes to add support for clauselist_selectivity() and clauselist_selectivity_ext(). However, if this is required in the future then the same struct being added here should be fine to use as a new output argument for those functions too. Author: David Rowley Discussion: https://postgr.es/m/CAApHDvqQqpk=1W-G_ds7A9CsXX3BggWj_7okinzkLVhDubQzjA@mail.gmail.com		5 years ago
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expected	Revert changes for SSL compression in libpq	5 years ago
sql	Revert changes for SSL compression in libpq	5 years ago
.gitignore	Add postgres_fdw contrib module.	13 years ago
Makefile	postgres_fdw: Add function to list cached connections to foreign servers.	5 years ago
connection.c	postgres_fdw: Add functions to discard cached connections.	5 years ago
deparse.c	Implement support for bulk inserts in postgres_fdw	5 years ago
option.c	Implement support for bulk inserts in postgres_fdw	5 years ago
postgres_fdw--1.0--1.1.sql	postgres_fdw: Add functions to discard cached connections.	5 years ago
postgres_fdw--1.0.sql	Add postgres_fdw contrib module.	13 years ago
postgres_fdw.c	Allow estimate_num_groups() to pass back further details about the estimation	5 years ago
postgres_fdw.control	postgres_fdw: Add function to list cached connections to foreign servers.	5 years ago
postgres_fdw.h	Implement support for bulk inserts in postgres_fdw	5 years ago
shippable.c	Replace remaining uses of "whitelist".	5 years ago