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Update StackOverFlowSurvey.scala

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Original file line number	Diff line number	Diff line change
`@@ -42,7 +42,7 @@ object StackOverFlowSurvey {`
`42`	`42`	`System.out.println("=== Print the result by salary middle point in descending order ===")`
`43`	`43`	`responseWithSelectedColumns.orderBy(responseWithSelectedColumns.col(SALARY_MIDPOINT).desc).show()`
`44`	`44`
`45`		`-System.out.println("=== Group by country and aggregate by average salary middle pointand max age middle point===")`
	`45`	`+System.out.println("=== Group by country and aggregate by average salary middle point ===")`
`46`	`46`	`valdatasetGroupByCountry= responseWithSelectedColumns.groupBy("country")`
`47`	`47`	`datasetGroupByCountry.avg(SALARY_MIDPOINT).show()`
`48`	`48`

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