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For a REPLICA IDENTITY FULL remote relation whose local counterpart has no primary key or replica identity, FindUsableIndexForReplicaIdentityFull() chooses the first index of a suitable shape from RelationGetIndexList(). That list excludes only indexes that are not indislive, so an invalid index left behind by a failed CREATE INDEX CONCURRENTLY can be selected. Such an index need not contain every row. Consequently, changes for rows that it fails to find can be silently dropped as missing-tuple conflicts. If the index contains no rows at all, the scan can instead error out and cause the apply worker to exit. Skip invalid indexes, as the planner does. Author: Mikhail Nikalayeu <mihailnikalayeu@gmail.com> Reviewed-by: Miłosz Bieniek <bieniek.milosz@proton.me> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Reviewed-by: Shlok Kyal <shlok.kyal.oss@gmail.com> Reviewed-by: Vignesh C <vignesh21@gmail.com> Reviewed-by: Ajin Cherian <itsajin@gmail.com> Discussion: https://postgr.es/m/CADzfLwWuubcbJBDRZ_J1SSqHDNjNmUYSAgf5y=17LxmP401xbw@mail.gmail.com Backpatch-through: 16, where it was introduced
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/.