JSON_TREE() Fullkey Behavior Change in SQLite 3.42.0 Issue Overview The core issue revolves around a behavioral change in the json_tree() function in SQLite, specifically in how the fullkey column is formatted when processing JSON data. In SQLite version 3.35.0, the fullkey column output for JSON keys containing digits or underscores did not include double quotes….
Issue Overview: SQLite Backup Tools and sqlite_dbpage Integration SQLite is a widely-used, lightweight database engine that is embedded in countless applications. One of its strengths is its simplicity and portability, but this also means that certain advanced features, such as built-in backup mechanisms, are not as robust as those found in more heavyweight database systems….
Understanding ANALYZE and Connection-Specific Statistics Caching SQLite relies on statistical metadata stored in internal tables (sqlite_stat1, sqlite_stat4, etc.) to guide the query planner in selecting optimal execution strategies. These statistics are generated via the ANALYZE command and include details such as index selectivity, row counts, and histogram data. A critical but often misunderstood aspect of…
Issue Overview: Custom FTS Tokenizers in SQLite-WASM The core issue revolves around the implementation and registration of custom tokenizers for Full-Text Search (FTS) virtual tables in SQLite when using the WebAssembly (WASM) build. Specifically, the discussion highlights the challenges of integrating custom tokenizers for FTS3/4 and FTS5 in a JavaScript environment. The primary concern is…
Issue Overview: SEE License Validation Succeeds in Console App but Fails in .NET WebAPI with "Native Method Forbidden" Error The core problem revolves around the SQLite Encryption Extension (SEE) license validation mechanism failing exclusively in a .NET WebAPI environment despite functioning correctly in a console application. The error System.NotSupportedException: {native method forbidden by license} occurs…
Understanding the LIKE Optimization Behavior in SQLite Virtual Tables The behavior of the LIKE optimization in SQLite, particularly when used with virtual tables, has undergone changes that affect how constraints are passed to the xBestIndex method. This issue arises when the ESCAPE clause in a LIKE expression uses a wildcard character such as _ or…
Issue Overview: Accidental Omission of Primary Key Constraint Causing Foreign Key Enforcement Failures The core problem arises when a table is created with an invalid column constraint syntax that SQLite silently accepts, leading to unintended consequences in foreign key relationships. In this scenario, a developer attempted to declare a column as a primary key using…
JOIN Condition Evaluation Failure in SQLite Versions 3.28-3.34 When Using LIKELIHOOD with AND Logic JOIN Clause Truth Miscalculation with LIKELIHOOD and AND Operator Core Problem Statement A critical defect exists in SQLite versions 3.28.0 through 3.34.0 where JOIN conditions containing the LIKELIHOOD() function combined with logical AND operators produce incorrect results. This manifests when: The…
Understanding Collation and Partial Index Behavior in SQLite Queries Issue Overview: Collation and Partial Index Interactions in SQLite The core issue revolves around unexpected query results when using partial indexes in SQLite, specifically in version 3.28, though the behavior persists in newer versions. The problem manifests when querying a table with a partial index defined…
Issue Overview: Partial Index UNIQUE Constraint Violation Suppressing INSERT and Affecting DISTINCT Query The core issue revolves around a misunderstanding of how SQLite’s partial unique indexes interact with INSERT statements and how subsequent queries process NULL values in indexed columns. The problem manifests when attempting to insert multiple rows with values that violate the partial…