TJX2014 commented on a change in pull request #28745:
URL: https://github.com/apache/spark/pull/28745#discussion_r436361472
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
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@@ -23,14 +23,18 @@ import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.analysis.UnresolvedAttribute
import org.apache.spark.sql.catalyst.expressions.codegen._
import org.apache.spark.sql.catalyst.plans.logical.EventTimeWatermark
-import org.apache.spark.sql.catalyst.util.quoteIdentifier
+import org.apache.spark.sql.catalyst.util.{quoteIdentifier, toPrettySQL}
import org.apache.spark.sql.types._
object NamedExpression {
private val curId = new java.util.concurrent.atomic.AtomicLong()
private[expressions] val jvmId = UUID.randomUUID()
def newExprId: ExprId = ExprId(curId.getAndIncrement(), jvmId)
def unapply(expr: NamedExpression): Option[(String, DataType)] =
Some((expr.name, expr.dataType))
+ def fromExpression(expr: Expression): NamedExpression = expr match {
+ case ne: NamedExpression => ne
+ case _: Expression => Alias(expr, toPrettySQL(expr))()
+ }
Review comment:
I find `org.apache.spark.sql.Dataset#groupBy(cols: Column*)` is invoked
through py4j instead of `groupBy(col1: String, cols: String*)`, is it possible
to change param sent in python side only to invoke `groupBy(col1: String, cols:
String*)` :-)
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