Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3743#discussion_r112561580 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/call.scala --- @@ -49,6 +57,128 @@ case class Call(functionName: String, args: Seq[Expression]) extends Expression } /** + * Over expression for calcite over transform. + * + * @param agg over-agg expression + * @param aggAlias agg alias for following `select()` clause. + * @param overWindowAlias over window alias + * @param overWindow over window + */ +case class OverCall( + agg: Aggregation, + var aggAlias: Expression, + overWindowAlias: Expression, + var overWindow: OverWindow = null) extends Expression { + + private[flink] def as(aggAlias: Expression): OverCall = { + this.aggAlias = aggAlias + this + } + + override private[flink] def toRexNode(implicit relBuilder: RelBuilder): RexNode = { + + val rexBuilder = relBuilder.getRexBuilder + + val operator: SqlAggFunction = agg.toSqlAggFunction() + + val aggReturnType: TypeInformation[_] = agg.resultType + + val relDataType = SqlTypeUtils.createSqlType(relBuilder.getTypeFactory, aggReturnType) + + val aggExprs: util.ArrayList[RexNode] = new util.ArrayList[RexNode]() + val aggChildName = agg.child.asInstanceOf[ResolvedFieldReference].name + + aggExprs.add(relBuilder.field(aggChildName)) + + val orderKeys: ImmutableList.Builder[RexFieldCollation] = + new ImmutableList.Builder[RexFieldCollation]() + + val sets:util.HashSet[SqlKind] = new util.HashSet[SqlKind]() + val orderName = overWindow.orderBy.asInstanceOf[UnresolvedFieldReference].name + + val rexNode = + if (orderName.equalsIgnoreCase("rowtime") || orderName.equalsIgnoreCase("proctime")) { + // for stream + relBuilder.literal(orderName) + } else { + // for batch + relBuilder.field(orderName) + } + + orderKeys.add(new RexFieldCollation(rexNode,sets)) + + val partitionKeys: util.ArrayList[RexNode] = new util.ArrayList[RexNode]() + overWindow.partitionBy.foreach(x=> --- End diff -- +spacea `foreach( x =>`
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