When postgres expands an inheritance tree it also adds the
parent hypertable as child relation. Since for a hypertable
the parent will never have any data we can mark this
relation as dummy relation so it gets ignored in later
steps. This is only relevant for code paths that use the
postgres inheritance code as we don't include the hypertable
as child when expanding the hypertable ourself.
This is similar to 3c40f924 which did the same adjustment for DELETE.
This patch also moves the marking into get_relation_info_hook so
it happens a bit earlier and prevents some additional cycles.
Add license information to files missing it and fix the license
check script to honor the return code of both the apache license
check and the TSL license check. Previously errors occurring during
apache license check would not be reflected in the return code of
the script, so only the TSL license check was effective.
Since the parent table of a hypertable cannot contain
any rows including it in the plan is not necessary. PostgreSQL might
also not have good statistics for the main table as autoanalyze is
triggered by inserts which never happen to the main table, leading to
worse plans.
This patch adds a new guc enable_constraint_exclusion to disable
planner constraint exclusion. Constraint exclusion will not work with
cursors and WHERE CURRENT OF so the new guc will allow you to disable
that feature.
This patch also fixes constraint exclusion for JOINs and sort
optimization for queries with chunks_in.
