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While discussing comment improvements (see next commit) by Justin Pryzby, Tom complained about a few details of the logic to infer the length of the NULL bitmap when building the JITed tuple deforming function. That bitmap allows to avoid checking the tuple header's natts, a check which often causes a pipeline stall Improvements: a) As long as missing columns aren't taken into account, we can continue to infer the length of the NULL bitmap from NOT NULL columns following it. Previously we stopped at the first missing column. It's unlikely to matter much in practice, but the alternative would have been to document why we stop. b) For robustness reasons it seems better to also check against attisdropped - RemoveAttributeById() sets attnotnull to false, but an additional check is trivial. c) Improve related comments Discussion: https://postgr.es/m/20637.1555957068@sss.pgh.pa.us Backpatch: - |
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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/.