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sqlite3_int64 sqlite3session_changeset_size(sqlite3_session *pSession);
By default, this function always returns 0. For it to return a useful result, the sqlite3_session object must have been configured to enable this API using sqlite3session_object_config() with the SQLITE_SESSION_OBJCONFIG_SIZE verb.
When enabled, this function returns an upper limit, in bytes, for the size of the changeset that might be produced if sqlite3session_changeset() were called. The final changeset size might be equal to or smaller than the size in bytes returned by this function.