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Up to now, otherrel RelOptInfos were built at the same time as baserel RelOptInfos, thanks to recursion in build_simple_rel(). However, nothing in query_planner's preprocessing cares at all about otherrels, only baserels, so we don't really need to build them until just before we enter make_one_rel. This has two benefits: * create_lateral_join_info did a lot of extra work to propagate lateral-reference information from parents to the correct children. But if we delay creation of the children till after that, it's trivial (and much harder to break, too). * Since we have all the restriction quals correctly assigned to parent appendrels by this point, it'll be possible to do plan-time pruning and never make child RelOptInfos at all for partitions that can be pruned away. That's not done here, but will be later on. Amit Langote, reviewed at various times by Dilip Kumar, Jesper Pedersen, Yoshikazu Imai, and David Rowley Discussion: https://postgr.es/m/9d7c5112-cb99-6a47-d3be-cf1ee6862a1d@lab.ntt.co.jp
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.