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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/01/14 09:17:23 UTC
[GitHub] [iotdb] yuerj opened a new issue #2493: 获取 path下的 nodes, 例如： show child nodes path
yuerj opened a new issue #2493:
URL: https://github.com/apache/iotdb/issues/2493
在已知path 下，获取path下的 nodes, 例如： show child nodes path
目前可以查到全路径，不支持只返回 node
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[GitHub] [iotdb] HTHou commented on issue #2493: 获取 path下的 nodes, 例如： show child nodes path
Posted by GitBox <gi...@apache.org>.
HTHou commented on issue #2493:
URL: https://github.com/apache/iotdb/issues/2493#issuecomment-786570036
Master branch has supported this feature now.
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[GitHub] [iotdb] HTHou edited a comment on issue #2493: 获取 path下的 nodes, 例如： show child nodes path
Posted by GitBox <gi...@apache.org>.
HTHou edited a comment on issue #2493:
URL: https://github.com/apache/iotdb/issues/2493#issuecomment-760070194
I think we can support sql like this.
```
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|
+-------------+-----+-------------+--------+--------+-----------+----+----------+
Total line number = 3
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|
+-------------+
Total line number = 3
It costs 0.015s
IoTDB> show child nodes root.sg.d1
+-----------+
|child nodes|
+-----------+
| s1|
| s2|
| s3|
+-----------+
Total line number = 3
It costs 0.142s
```
To implement it, just consider a modification of the method `findChildNodePathInNextLevel` in https://github.com/apache/iotdb/blob/master/server/src/main/java/org/apache/iotdb/db/metadata/MTree.java
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[GitHub] [iotdb] HTHou closed issue #2493: 获取 path下的 nodes, 例如： show child nodes path
Posted by GitBox <gi...@apache.org>.
HTHou closed issue #2493:
URL: https://github.com/apache/iotdb/issues/2493
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[GitHub] [iotdb] HTHou commented on issue #2493: 获取 path下的 nodes, 例如： show child nodes path
Posted by GitBox <gi...@apache.org>.
HTHou commented on issue #2493:
URL: https://github.com/apache/iotdb/issues/2493#issuecomment-760070194
I think we can support sql like this.
```
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|
+-------------+-----+-------------+--------+--------+-----------+----+----------+
Total line number = 3
It costs 0.026s
IoTDB> show child nodes root.sg.d1
+-----------+
|child nodes|
+-----------+
| s1|
| s2|
| s3|
+-----------+
Total line number = 3
It costs 0.142s
```
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[GitHub] [iotdb] HTHou edited a comment on issue #2493: 获取 path下的 nodes, 例如： show child nodes path
Posted by GitBox <gi...@apache.org>.
HTHou edited a comment on issue #2493:
URL: https://github.com/apache/iotdb/issues/2493#issuecomment-760070194
I think we can support sql like this.
```
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|
+-------------+-----+-------------+--------+--------+-----------+----+----------+
Total line number = 3
It costs 0.026s
IoTDB> show child nodes root.sg.d1
+-----------+
|child nodes|
+-----------+
| s1|
| s2|
| s3|
+-----------+
Total line number = 3
It costs 0.142s
```
To implement it, just consider a modification of the method `findChildNodePathInNextLevel` in https://github.com/apache/iotdb/blob/master/server/src/main/java/org/apache/iotdb/db/metadata/MTree.java
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