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Ред База Данных 5 - 5.1.4

12/29/2025

Changelog:

Fixes

• Add exponential backoff for guessed selectivities (for unmatched booleans), thus accounting their possible inter-dependencies and delivering more realistic selectivity estimations when many booleans are used.
• Add collision list sorting to the total hash join cost.
• Sample more than one data page (for large enough tables) to estimate the stored record size more accurately, thus improving the cardinality estimation.
• UNION ALL optimization with constant false condition. FB-8113.
• Better choice between LOOP/HASH plans in special joins.
• Selectivity adjustments: allow values < 1 (they're valid in some cases) and better estimations for NOT/OR predicates.
• Fix missing inversion when the bounded ORDER plan is converted into the SORT one.
• Frontport from RDB3: Get current timestamp only if it is really needed for string to datetime conversion. RS-269898, RS-42828.
• Slightly rework synchronization to allow engine checkouts during replication I/O. RS-263665.
• Restore the broken record layout optimization by gbak and extend it to the new datatypes. FB-8815.
• Log warnings about missing LDAP attributes only if "TraceAuthentication" parameter is enabled. RS-85492.

Improvements

• New context variable REPLICATION_STATUS_JSON. RS-268666.