const char *sqlite3_vtab_collation(sqlite3_index_info*,int);
This function may only be called from within a call to the xBestIndex method of a virtual table.
The first argument must be the sqlite3_index_info object that is the first parameter to the xBestIndex() method. The second argument must be an index into the aConstraint array belonging to the sqlite3_index_info structure passed to xBestIndex. This function returns a pointer to a buffer containing the name of the collation sequence for the corresponding constraint.
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