reset method
void
reset()
Reset the query builder state
Implementation
void reset() {
_query = "";
_result.clear();
_bindings.clear();
_whereConditions.clear();
_orderByConditions.clear();
_groupByConditions.clear();
_havingConditions.clear();
_limit = null;
_offset = null;
_distinct = false;
_selectColumns.clear();
}