如何确定子路径是 Apache IoTDB 中的节点还是时间序列答案

【问题标题】：How to determine whether a subpath is a node or a timeseries in Apache IoTDB如何确定子路径是 Apache IoTDB 中的节点还是时间序列
【发布时间】：2021-12-10 04:12:51
【问题描述】：

比如有一个路径root.sg_2。

show child paths root.sg_2可以显示它的子路径，但是我无法确定子路径是节点还是时间序列。

我尝试使用show timeseries，它会显示所有时间序列。但我只想知道子路径的信息。

【问题讨论】：

标签： apache-iotdb iotdb

【解决方案1】：

您可以使用SHOW TIMESERIES <PathPattern>。

IoTDB> show timeseries
+----------------+-----+-------------+--------+--------+-----------+----+----------+
|      timeseries|alias|storage group|dataType|encoding|compression|tags|attributes|
+----------------+-----+-------------+--------+--------+-----------+----+----------+
|   root.sg.d1.s3| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
|   root.sg.d1.s1| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
|   root.sg.d1.s2| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
|root.sg.d1.c1.s4| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
|root.sg.d1.c1.s5| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
+----------------+-----+-------------+--------+--------+-----------+----+----------+
Total line number = 5
It costs 0.026s

IoTDB> show child paths root.sg.d1
+-------------+
|  child paths|
+-------------+
|root.sg.d1.s1|
|root.sg.d1.s2|
|root.sg.d1.s3|
|root.sg.d1.c1|
+-------------+
Total line number = 4
It costs 0.015s

IoTDB> show timeseries root.sg.d1.*
+----------------+-----+-------------+--------+--------+-----------+----+----------+
|      timeseries|alias|storage group|dataType|encoding|compression|tags|attributes|
+----------------+-----+-------------+--------+--------+-----------+----+----------+
|   root.sg.d1.s3| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
|   root.sg.d1.s1| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
|   root.sg.d1.s2| null|      root.sg|   INT32|     RLE|     SNAPPY|null|      null|
+----------------+-----+-------------+--------+--------+-----------+----+----------+
Total line number = 3
It costs 0.015s

IoTDB> show timeseries root.sg.*
+----------------+-----+-------------+--------+--------+-----------+----+----------+
|      timeseries|alias|storage group|dataType|encoding|compression|tags|attributes|
+----------------+-----+-------------+--------+--------+-----------+----+----------+
+----------------+-----+-------------+--------+--------+-----------+----+----------+
Total line number = 0

查看文档https://iotdb.apache.org/UserGuide/Master/IoTDB-SQL-Language/DDL-Data-Definition-Language.html#show-timeseries了解更多详情。

【讨论】：