cloud-fan commented on a change in pull request #33352:
URL: https://github.com/apache/spark/pull/33352#discussion_r672369093
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala
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@@ -133,6 +144,32 @@ object JDBCRDD extends Logging {
})
}
+ def compileAggregates(
+ aggregates: Seq[AggregateFunc],
+ dialect: JdbcDialect): (Array[String]) = {
+ def quote(colName: String): String = dialect.quoteIdentifier(colName)
+
+ val aggBuilder = ArrayBuilder.make[String]
+ aggregates.map {
Review comment:
Sorry I don't get it. Why not just `aggregates.map`? Why do we need an
ArrayBuilder?
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