5ee9d7c299
We were skipping a bunch of things that are mostly unnecessary for REPACK. However, one thing that seems would be better to pass closer to truth, is the updatedCols bitmapset in the range table entry for the repacked table. Cons up an RTE and install it into the EState. This only has an effect on btree indexes, because certain operations are optimized in the case of unchanged columns; and even then, correctnesss is not being compromised. The values we pass after this commit are not fully trustworthy either, because we simply say "all columns were updated" for all insert/updates, regardless of whether their values were actually modified or not. However, this way we err to the side of caution rather than to the opposite direction as we were originally doing. This could be refined in the future, but there's a trade-off: determining whether the column was in fact updated could be expensive. Author: Antonin Houska <ah@cybertec.at> Reviewed-by: Ewan Young <kdbase.hack@gmail.com> Backpatch-through: 19 Discussion: https://postgr.es/m/18222.1782126731@localhost |
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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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.