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All SQLite error codes
SQLite error code

SQLITE_WARNING_AUTOINDEX

SQLITE_WARNING_AUTOINDEX is SQLite result code 284, an extended code of SQLITE_WARNING.

Result code284
NameSQLITE_WARNING_AUTOINDEX
Primary codeSQLITE_WARNING

What it means

The SQLITE_WARNING_AUTOINDEX result code is passed to the callback of sqlite3_log() whenever automatic indexing is used. This can serve as a warning to application designers that the database might benefit from additional indexes.

Source: SQLite Result and Error Codes