-- 分区明细按 AreaId 全量/分页查询时避免 filesort 打满 sort_buffer（查价 LIVE 路径易踩）
SET @db := DATABASE();

SET @idx := (
  SELECT COUNT(1)
  FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = @db
    AND TABLE_NAME = 't_kpi_area_info'
    AND INDEX_NAME = 'idx_kpi_info_area_id'
);
SET @sql := IF(
  @idx = 0,
  'ALTER TABLE `t_kpi_area_info` ADD KEY `idx_kpi_info_area_id` (`AreaId`, `Id`)',
  'SELECT ''idx_kpi_info_area_id already exists'' AS info'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;