跳到主要内容
跳到主要内容

ICEBERG_META

iceberg_meta

Name

iceberg_meta

description

iceberg_meta 表函数(table-valued-function,tvf),可以用于读取 iceberg 表的各类元数据信息,如操作历史、生成的快照、文件元数据等。

syntax

iceberg_meta(
"table" = "ctl.db.tbl",
"query_type" = "snapshots"
...
);

参数说明

iceberg_meta 表函数 tvf 中的每一个参数都是一个 "key"="value" 对。 相关参数:

  • table: (必填) 完整的表名,需要按照目录名。库名。表名的格式,填写需要查看的 iceberg 表名。
  • query_type: (必填) 想要查看的元数据类型,目前仅支持 snapshots。

Example

读取并访问 iceberg 表格式的 snapshots 元数据。

select * from iceberg_meta("table" = "ctl.db.tbl", "query_type" = "snapshots");

可以配合desc function使用

desc function iceberg_meta("table" = "ctl.db.tbl", "query_type" = "snapshots");

Keywords

iceberg_meta, table-valued-function, tvf

Best Prac

查看 iceberg 表的 snapshots

select * from iceberg_meta("table" = "iceberg_ctl.test_db.test_tbl", "query_type" = "snapshots");
+------------------------+----------------+---------------+-----------+-------------------+------------------------------+
| committed_at | snapshot_id | parent_id | operation | manifest_list | summary |
+------------------------+----------------+---------------+-----------+-------------------+------------------------------+
| 2022-09-20 11:14:29 | 64123452344 | -1 | append | hdfs:/path/to/m1 | {"flink.job-id":"xxm1", ...} |
| 2022-09-21 10:36:35 | 98865735822 | 64123452344 | overwrite | hdfs:/path/to/m2 | {"flink.job-id":"xxm2", ...} |
| 2022-09-21 21:44:11 | 51232845315 | 98865735822 | overwrite | hdfs:/path/to/m3 | {"flink.job-id":"xxm3", ...} |
+------------------------+----------------+---------------+-----------+-------------------+------------------------------+

根据 snapshot_id 字段筛选

select * from iceberg_meta("table" = "iceberg_ctl.test_db.test_tbl", "query_type" = "snapshots") 
where snapshot_id = 98865735822;
+------------------------+----------------+---------------+-----------+-------------------+------------------------------+
| committed_at | snapshot_id | parent_id | operation | manifest_list | summary |
+------------------------+----------------+---------------+-----------+-------------------+------------------------------+
| 2022-09-21 10:36:35 | 98865735822 | 64123452344 | overwrite | hdfs:/path/to/m2 | {"flink.job-id":"xxm2", ...} |
+------------------------+----------------+---------------+-----------+-------------------+------------------------------+