[VL] Support regr_r2 aggregate function

[liujiayi771]

What changes were proposed in this pull request?

Support regr_r2 aggregate function.

How was this patch tested?

Add new test case in VeloxAggregateFunctionsSuite

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[GLUTEN-${ISSUES_ID}][COMPONENT]feat/fix: ${detailed message}

See also:

• Other pull requests

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[liujiayi771]

cc @rui-mo @PHILO-HE, thanks.

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[liujiayi771]

If the CH failed tests are the ones just fixed by 131f700, we can ignore the failure.

Yes, we can ignore the failure.

[2024-04-01T09:30:12.651Z] - test mergetree table write *** FAILED ***
[2024-04-01T09:30:12.651Z]   org.apache.spark.SparkException: Job aborted.
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.errors.QueryExecutionErrors$.jobAbortedError(QueryExecutionErrors.scala:651)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.execution.datasources.v1.clickhouse.MergeTreeFileFormatWriter$.write(MergeTreeFileFormatWriter.scala:252)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.delta.ClickhouseOptimisticTransaction.$anonfun$writeFiles$1(ClickhouseOptimisticTransaction.scala:124)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$6(SQLExecution.scala:109)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.execution.SQLExecution$.withSQLConfPropagated(SQLExecution.scala:169)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$1(SQLExecution.scala:95)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.SparkSession.withActive(SparkSession.scala:779)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:64)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.delta.ClickhouseOptimisticTransaction.writeFiles(ClickhouseOptimisticTransaction.scala:76)
[2024-04-01T09:30:12.651Z]   at org.apache.spark.sql.delta.files.TransactionalWrite.writeFiles(TransactionalWrite.scala:212)