Issue Overview: FILTER Clause Ignored in MIN/MAX Window Functions with Non-Unbounded Frames The core issue revolves around the incorrect handling of the FILTER clause in SQLite when used with window functions, specifically MIN and MAX, under certain conditions. The problem manifests when the following three conditions are met: The MIN or MAX function is used…
Understanding the Limitations of NEAR in Enforcing Exact Word Distances SQLite’s FTS5 module provides powerful full-text search capabilities, but its NEAR operator has inherent limitations when users require exact word distance constraints. The NEAR operator allows proximity searches by specifying a maximum allowed distance between two or more terms. For example, NEAR(word1 word2, 10) matches…
Fundamentals of SQLite’s Query Plan Stability Guarantee (QPSG) The Query Plan Stability Guarantee (QPSG) is a critical feature in SQLite designed to eliminate unpredictability in query execution performance. At its core, QPSG ensures that once a query plan is generated during testing or development, the same plan will be reused in production environments. This guarantee…
Missing Line Editing Support in SQLite3 Shell Across Operating Systems Issue Overview The SQLite3 command-line interface (CLI) provides interactive features such as command history navigation using the up/down arrow keys. However, this functionality behaves inconsistently across operating systems. On Windows, the sqlite3.exe shell typically supports arrow-key history due to integration with the cmd.exe terminal. On…
Understanding Case-Insensitive LIKE and Accented Characters in SQLite SQLite is a powerful, lightweight database engine that is widely used for its simplicity and efficiency. However, when it comes to handling case-insensitive searches with accented characters, users often encounter unexpected behavior. This issue arises due to the way SQLite implements the LIKE operator and its handling…
Issue Overview: sqllogictest Fails to Detect Row Count Mismatches The core issue revolves around the behavior of SQLite’s sqllogictest utility, which is designed to validate SQL queries by comparing their results against expected outputs. However, the utility has a critical limitation: it does not inherently check for discrepancies in the number of rows returned by…
Understanding Column Consistency in sqlite3_exec() Callback Invocations The core challenge revolves around guaranteeing that the number of columns (argc) and their corresponding names remain unchanged across successive invocations of the callback function registered with sqlite3_exec(). Developers often assume that these parameters are fixed for all rows returned by a single SQL statement execution. However, nuances…
Issue Overview: Double Prompt in SQLite Shell with MinGW64 (MSVCRT) The core issue revolves around a double prompt behavior observed in the SQLite shell when compiled using MinGW64 with the MSVCRT runtime library on Windows. Specifically, after pressing the Return key, the prompt text is printed twice, leading to an output like this: sqlite> sqlite>…
Issue Overview: –exe Argument Not Respected in Local sqlite3_rsync Operations The sqlite3_rsync utility is designed to synchronize SQLite databases across systems, with support for specifying a custom executable name via the –exe parameter. However, when both the origin and replica databases are local (i.e., residing on the same machine), the –exe argument is not honored….
Understanding the Need for Unique Column Values During Insert When working with SQLite, a common requirement is to ensure that a specific column value remains unique within a table. This is particularly important in scenarios where the integrity of the data depends on the uniqueness of certain attributes. For instance, consider a table named filter_types…