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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2019/07/21 09:07:36 UTC
[GitHub] [incubator-iotdb] SilverNarcissus opened a new pull request #279:
Spark connector xuekaifeng
SilverNarcissus opened a new pull request #279: Spark connector xuekaifeng
URL: https://github.com/apache/incubator-iotdb/pull/279
/**
* transfer old form to new form
*
* @param df dataFrame need to be tansfer
* +---------+-------------+-------------+-------------+-------------+-------------+-------------+
* |timestamp|root.ln.d1.m1|root.ln.d1.m2|root.ln.d1.m3|root.ln.d2.m1|root.ln.d2.m2|root.ln.d2.m3|
* +---------+-------------+-------------+-------------+-------------+-------------+-------------+
* | 1| 11| 12| null| 21| 22| 23|
* +---------+-------------+-------------+-------------+-------------+-------------+-------------+
* @return tansferred data frame
* +---------+-----------+---+---+----+
* |timestamp|device_name| m1| m2| m3|
* +---------+-----------+---+---+----+
* | 1| root.ln.d2| 21| 22| 23|
* | 1| root.ln.d1| 11| 12|null|
* +---------+-----------+---+---+----+
*/
and reversely
/**
* transfer new form to old form
*
* @param df dataFrame need to be tansfer
* +---------+-----------+---+---+----+
* |timestamp|device_name| m1| m2| m3|
* +---------+-----------+---+---+----+
* | 1| root.ln.d2| 21| 22| 23|
* | 1| root.ln.d1| 11| 12|null|
* +---------+-----------+---+---+----+
* @return tansferred data frame
* +---------+-------------+-------------+-------------+-------------+-------------+-------------+
* |timestamp|root.ln.d1.m1|root.ln.d1.m2|root.ln.d1.m3|root.ln.d2.m1|root.ln.d2.m2|root.ln.d2.m3|
* +---------+-------------+-------------+-------------+-------------+-------------+-------------+
* | 1| 11| 12| null| 21| 22| 23|
* +---------+-------------+-------------+-------------+-------------+-------------+-------------+
*
*/
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