ajantha-bhat 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_r358088742
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File path: integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/mutation/CarbonProjectForUpdateCommand.scala
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@@ -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:
@zzcclp : I just modified like your solution and checked In "UpdateCarbonTableTestCase" itself 40 testcase failed.
I will explain why it fails now,
Here we don't want to throw exception if the `selectStmt` has more than one result, we need to throw exception when the it has more than one duplicate result.
Example:
src has id = 1, 2. It need to update all the id, But the subquery results that 1,1,2. Now we don't know the 1 matches with the first or second. so only in this case we need to throw exception.
Tell me if you have any other solution for this problem.
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