code: func (m *LRUCacher) clearIds(tableName string) {
  	if tis, ok := m.sqlIndex[tableName]; ok {
  		for sql, v := range tis {
  			m.sqlList.Remove(v)
  			m.store.Del(sql)
  		}
  	}
  	m.sqlIndex[tableName] = make(map[string]*list.Element)
  }
docs: // clearIds clears all sql-ids mapping on table tableName from cache