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The Virtual Table Mechanism Of SQLite
(vtab.html)
2.3. The xBestIndex Method
... define SQLITE_INDEX_SCAN_UNIQUE 1 /* Scan visits at most 1 row */
Use the sqlite3_vtab_collation() interface to find the name of
the collating sequence that should be used when evaluating the i-th
constraint:
const char *sqlite3_vtab_collation(sqlite3_index_info*, int i);
The SQLite core ...
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SQLite FTS5 Extension
(fts5.html)
7.2.1. Custom Auxiliary Functions API Overview
... The difference is that instead of iterating through the
matches for a single, specified phrase, the xInstCount/xInst APIs collate
all matches into a single flat array, sorted in order of occurrence within
the current row. Elements of this array ...
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