使用spark scala中的窗口函数删除重复记录

时间：2018-05-10 09:30:16

标签： scala apache-spark apache-spark-sql spark-dataframe

或者只是为了让这个简单易懂 我有一个数据框。

DataPartition   TimeStamp   OrganizationID  SourceID    AuditorID   AuditorEnumerationId    AuditorOpinionCode  AuditorOpinionId    IsPlayingAuditorRole    IsPlayingCSRAuditorRole IsPlayingTaxAdvisorRole FFAction|!| AuditorOpinionOnInternalControlCode AuditorOpinionOnGoingConcernCode    AuditorOpinionOnInternalControlsId  AuditorOpinionOnGoingConcernId  rank
Japan   2018-05-03T09:52:48+00:00   4295876589  194 null    null    null    null    null    null    null    O|!|    null    null    null    null    1
Japan   2018-05-03T09:52:48+00:00   4295876589  194 2719    3023331 AOP 3010542 true    false   true    O|!|    null    null    null    null    1
Japan   2018-05-03T09:52:48+00:00   4295876589  195 16157   1002485247  UWE 3010547 true    false   false   O|!|    null    null    null    null    1
Japan   2018-05-03T07:36:47+00:00   4295876589  196 3252    3024053 ONC 3020538 true    false   true    O|!|    null    null    null    null    1
Japan   2018-05-03T07:36:47+00:00   4295876589  195 5937    3026578 NOP 3010543 true    false   true    O|!|    null    null    null    null    1
Japan   2018-05-02T10:37:50+00:00   4295876589  156 null    null    null    null    null    null    null    O|!|    null    null    null    null    1
Japan   2018-05-02T10:37:50+00:00   4295876589  157 null    null    null    null    null    null    null    O|!|    null    null    null    null    1
Japan   2018-05-02T10:37:56+00:00   4295876589  193 null    null    null    null    null    null    null    O|!|    null    null    null    null    1
Japan   2018-05-03T08:10:19+00:00   4295876589  196 null    null    null    null    null    null    null    D|!|    null    null    null    null    1
Japan   2018-05-03T09:52:48+00:00   4295876589  195 null    null    null    null    null    null    null    O|!|    null    null    null    null    1

现在我需要选择Rank = 1和AuditorID！= null的列，但AuditorID =！= null仅适用于FFAction |！| =“O”。

在这种情况下，我的输出数据框应如下所示

DataPartition   TimeStamp   OrganizationID  SourceID    AuditorID   AuditorEnumerationId    AuditorOpinionCode  AuditorOpinionId    IsPlayingAuditorRole    IsPlayingCSRAuditorRole IsPlayingTaxAdvisorRole FFAction|!| AuditorOpinionOnInternalControlCode AuditorOpinionOnGoingConcernCode    AuditorOpinionOnInternalControlsId  AuditorOpinionOnGoingConcernId  rank

Japan   2018-05-03T09:52:48+00:00   4295876589  194 2719    3023331 AOP 3010542 true    false   true    O|!|    null    null    null    null    1
Japan   2018-05-03T09:52:48+00:00   4295876589  195 16157   1002485247  UWE 3010547 true    false   false   O|!|    null    null    null    null    1
Japan   2018-05-03T07:36:47+00:00   4295876589  196 3252    3024053 ONC 3020538 true    false   true    O|!|    null    null    null    null    1
Japan   2018-05-03T07:36:47+00:00   4295876589  195 5937    3026578 NOP 3010543 true    false   true    O|!|    null    null    null    null    1
Japan   2018-05-02T10:37:56+00:00   4295876589  193 null    null    null    null    null    null    null    I|!|    null    null    null    null    1
Japan   2018-05-03T08:10:19+00:00   4295876589  196 null    null    null    null    null    null    null    D|!|    null    null    null    null    1

这是我的代码

import org.apache.spark.sql.expressions._
    val windowSpec = Window.partitionBy("OrganizationID", "SourceID", "AuditorID").orderBy(unix_timestamp($"TimeStamp", "yyyy-MM-dd'T'HH:mm:ss").cast("timestamp").desc)
    val latestForEachKey1 = finaldf.withColumn("rank", row_number().over(windowSpec))
    .filter($"rank" === 1 && $"AuditorID" =!= "null")

情景2 ......

这是我的数据框

uniqueFundamentalSet    PeriodId    SourceId    StatementTypeCode   StatementCurrencyId UpdateReason_updateReasonId UpdateReasonComment UpdateReasonComment_languageId  UpdateReasonEnumerationId   FFAction|!| DataPartition   PartitionYear   TimeStamp
192730230775    297 182 INC 500186  6   UpdateReasonToDelete    505074  3019685 I|!|    Japan   2017    2018-05-10T09:57:29+00:00
192730230775    297 182 INC 500186  6   UpdateReasonToDelete    505074  3019685 I|!|    Japan   2017    2018-05-10T10:00:40+00:00
192730230775    297 182 INC 500186  null    null    null    null    O|!|    Japan   2017    2018-05-10T10:11:15+00:00
192730230775    310 182 INC 500186  null    null    null    null    O|!|    Japan   2018    2018-05-10T08:30:53+00:00

当我应用代码建议我回答我得到低于输出

val windowSpec = Window.partitionBy("uniqueFundamentalSet", "PeriodId", "SourceId", "StatementTypeCode", "StatementCurrencyId", "UpdateReason_updateReasonId").orderBy(unix_timestamp($"TimeStamp", "yyyy-MM-dd'T'HH:mm:ss").cast("timestamp").desc)
    val latestForEachKey1 = tempReorder.withColumn("rank", row_number().over(windowSpec))
      .filter($"rank" === 1 && (($"UpdateReason_updateReasonId" =!= "null" && $"FFAction|!|" === "O|!|") || $"FFAction|!|" =!= "O|!|")).drop("rank")

192730230775    297 182 INC 500186  6   UpdateReasonToDelete    505074  3019685 I|!|    Japan   2017    2018-05-10T10:00:40+00:00

但我的预期输出是这个。

192730230775    297 182 INC 500186  null    null    null    null    O|!|    Japan   2017    2018-05-10T10:11:15+00:00

2 个答案:

答案 0 :(得分：1)

这是你的工作代码

import org.apache.spark.sql.expressions._
val windowSpec = Window.partitionBy("OrganizationID", "SourceID", "AuditorID").orderBy(unix_timestamp($"TimeStamp", "yyyy-MM-dd'T'HH:mm:ss").cast("timestamp").desc)
val latestForEachKey1 = finaldf.withColumn("rank", row_number().over(windowSpec))
  .filter($"rank" === 1 && (($"AuditorID" =!= "null" && $"FFAction|!|" === "O|!|") || $"FFAction|!|" =!= "O|!|"))

应该给你

+-------------+-------------------------+--------------+--------+---------+--------------------+------------------+----------------+--------------------+-----------------------+-----------------------+-----------+-----------------------------------+--------------------------------+----------------------------------+------------------------------+----+
|DataPartition|TimeStamp                |OrganizationID|SourceID|AuditorID|AuditorEnumerationId|AuditorOpinionCode|AuditorOpinionId|IsPlayingAuditorRole|IsPlayingCSRAuditorRole|IsPlayingTaxAdvisorRole|FFAction|!||AuditorOpinionOnInternalControlCode|AuditorOpinionOnGoingConcernCode|AuditorOpinionOnInternalControlsId|AuditorOpinionOnGoingConcernId|rank|
+-------------+-------------------------+--------------+--------+---------+--------------------+------------------+----------------+--------------------+-----------------------+-----------------------+-----------+-----------------------------------+--------------------------------+----------------------------------+------------------------------+----+
|Japan        |2018-05-03T09:52:48+00:00|4295876589    |194     |2719     |3023331             |AOP               |3010542         |true                |false                  |true                   |O|!|       |null                               |null                            |null                              |null                          |1   |
|Japan        |2018-05-03T09:52:48+00:00|4295876589    |195     |16157    |1002485247          |UWE               |3010547         |true                |false                  |false                  |O|!|       |null                               |null                            |null                              |null                          |1   |
|Japan        |2018-05-03T07:36:47+00:00|4295876589    |196     |3252     |3024053             |ONC               |3020538         |true                |false                  |true                   |O|!|       |null                               |null                            |null                              |null                          |1   |
|Japan        |2018-05-03T07:36:47+00:00|4295876589    |195     |5937     |3026578             |NOP               |3010543         |true                |false                  |true                   |O|!|       |null                               |null                            |null                              |null                          |1   |
|Japan        |2018-05-03T08:10:19+00:00|4295876589    |196     |null     |null                |null              |null            |null                |null                   |null                   |D|!|       |null                               |null                            |null                              |null                          |1   |
+-------------+-------------------------+--------------+--------+---------+--------------------+------------------+----------------+--------------------+-----------------------+-----------------------+-----------+-----------------------------------+--------------------------------+----------------------------------+------------------------------+----+

注意：sourceID 193的记录有o |！|并且为null，因此它不应该在输出中

答案 1 :(得分：0)

您可以使用rownum udf删除重复项并检查是否为rownum = 1且authorid不为null

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