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c426f7c2b3
A REINDEX CONCURRENTLY run on a table with no indexes would always pop
the topmost snapshot from the active snapshot stack, making the snapshot
handling inconsistent between the multiple-relation and single-relation
cases. This commit slightly changes the snapshot stack handling so as a
snapshot is popped only ReindexMultipleInternal() in this case after a
relation has been reindexed, fixing a problem where an event trigger
function may need a snapshot but does not have one. This also keeps the
places where PopActiveSnapshot() is called closer to each other.
While on it, this expands the existing tests to cover all the cases that
could be faced with REINDEX commands and such event triggers, for one or
more relations, with or without indexes.
This behavior is inconsistent since
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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. 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, 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/.