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Virtual Table Scan Flags

#define SQLITE_INDEX_SCAN_UNIQUE      1     /* Scan visits at most 1 row */

Virtual table implementations are allowed to set the sqlite3_index_info.idxFlags field to some combination of these bits.

See also lists of Objects, Constants, and Functions.

SQLite is in the Public Domain.
https://sqlite.org/c3ref/c_index_scan_unique.html