导出系统

migrations/000153_alter_export_shard_task_offset.down.sql

@@ -0,0 +1,4 @@
+-- 回滚导出分片任务 offset/limit 分片字段
+ALTER TABLE tb_export_shard_task
+    DROP COLUMN IF EXISTS shard_limit,
+    DROP COLUMN IF EXISTS shard_offset;

migrations/000153_alter_export_shard_task_offset.up.sql

@@ -0,0 +1,7 @@
+-- 为导出分片任务补充 offset/limit 分片字段
+ALTER TABLE tb_export_shard_task
+    ADD COLUMN IF NOT EXISTS shard_offset BIGINT NOT NULL DEFAULT 0,
+    ADD COLUMN IF NOT EXISTS shard_limit INT NOT NULL DEFAULT 0;
+
+COMMENT ON COLUMN tb_export_shard_task.shard_offset IS '分片偏移量(offset)';
+COMMENT ON COLUMN tb_export_shard_task.shard_limit IS '分片行数上限(limit)';