480bc6e3ed
Certain cases involving the use of cursors had assertion failures within _bt_preprocess_keys's recently added no-op return path. The assertion in question made the faulty assumption that a second or third call to _bt_preprocess_keys (within the same btrescan) could only happen when another scheduled primitive index scan was just about to begin. It would be possible to address the problem by only allowing scans that have array keys to take the new no-op path, forcing affected cases to perform redundant preprocessing work. It seems simpler to just remove the assertion, and reframe the no-op path as a more general mechanism. Take this simpler approach. The important underlying principle is that we only need to perform preprocessing once per btrescan (at most). This is expected regardless of whether or not the scan happens to have array keys. Oversight in commit 1b134ca5, which enhanced nbtree ScalarArrayOp execution. Reported-By: Alexander Lakhin <exclusion@gmail.com> Discussion: https://postgr.es/m/ef0f7c8b-a6fa-362e-6fd6-054950f947ca@gmail.com
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.
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