[GitHub] [carbondata] zzcclp commented on a change in pull request #3509: [CARBONDATA-3618] Update query should throw exception if key has more than one value

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zzcclp commented on a change in pull request #3509: [CARBONDATA-3618] Update query should throw exception if key has more than one value
URL: https://github.com/apache/carbondata/pull/3509#discussion_r357949025
 
 

 ##########
 File path: integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/mutation/CarbonProjectForUpdateCommand.scala
 ##########
 @@ -135,7 +136,22 @@ private[sql] case class CarbonProjectForUpdateCommand(
           else {
             Dataset.ofRows(sparkSession, plan)
           }
-
+          // If more than one value present for the update key, should fail the update
+          val ds = dataSet.select(CarbonCommonConstants.CARBON_IMPLICIT_COLUMN_TUPLEID)
 
 Review comment:
   dataSet here includes all data which will be loaded, if the size of data which are to be updated is huge, I think this check will impact update performance.
   It better check the count of updated data in 'CarbonIUDAnalysisRule.processUpdateQuery', before parse 'selectStmt' to 'selectPlan', for example:
   line 115 in CarbonAnalysisRules.scala, check the count:
   ```
   if (sparkSession.sql(selectStmt).count() > 1) {
     throw exception
   }
   ```

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