Setting The Subtype Of An SQL Function

void sqlite3_result_subtype(sqlite3_context*,unsigned int);

The sqlite3_result_subtype(C,T) function causes the subtype of the result from the application-defined SQL function with sqlite3_context C to be the value T. Only the lower 8 bits of the subtype T are preserved in current versions of SQLite; higher order bits are discarded. The number of subtype bytes preserved by SQLite might increase in future releases of SQLite.

See also lists of Objects, Constants, and Functions.

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https://sqlite.org/c3ref/result_subtype.html