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Commit 40dae7ec537, which made the nbtree page split algorithm more robust, made _bt_insert_parent() only unlock the right child of the parent page before inserting a new downlink into the parent. Update a comment from the Berkeley days claiming that both left and right child pages are unlocked before the new downlink actually gets inserted. The claim that it is okay to release both locks early based on Lehman and Yao's say-so never made much sense. Lehman and Yao must sometimes "couple" buffer locks across a pair of internal pages when relocating a downlink, unlike the corresponding code within _bt_getstack().
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/.