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From: fhueske <git@git.apache.org>
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Subject: [GitHub] flink pull request #3700: Backbone implementation for supporting sort. Imple...
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Message-Id: <20170407211411.3B829F21A4@git1-us-west.apache.org>
Date: Fri,  7 Apr 2017 21:14:11 +0000 (UTC)
archived-at: Fri, 07 Apr 2017 21:14:16 -0000

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3700#discussion_r110477127
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/datastream/DataStreamSortRule.scala ---
    @@ -0,0 +1,67 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.flink.table.plan.rules.datastream
    +
    +import org.apache.calcite.plan.volcano.RelSubset
    +import org.apache.calcite.plan.{ Convention, RelOptRule, RelOptRuleCall, RelTraitSet }
    +import org.apache.calcite.rel.RelNode
    +import org.apache.calcite.rel.convert.ConverterRule
    +import org.apache.calcite.rel.logical.{ LogicalFilter, LogicalCorrelate, LogicalTableFunctionScan }
    +import org.apache.calcite.rex.RexNode
    +import org.apache.flink.table.plan.nodes.datastream.DataStreamConvention
    +import org.apache.flink.table.plan.nodes.datastream.DataStreamCorrelate
    +import org.apache.calcite.rel.logical.LogicalSort
    +import org.apache.flink.table.plan.nodes.datastream.DataStreamSort
    +
    +/**
    + * Rule to convert a LogicalSort into a DataStreamSort.
    + */
    +class DataStreamSortRule
    +    extends ConverterRule(
    +      classOf[LogicalSort],
    +      Convention.NONE,
    +      DataStreamConvention.INSTANCE,
    +      "DataStreamSortRule") {
    +
    +  override def matches(call: RelOptRuleCall): Boolean = {
    +    super.matches(call)
    +  }
    +
    +  override def convert(rel: RelNode): RelNode = {
    +    val calc: LogicalSort = rel.asInstanceOf[LogicalSort]
    --- End diff --
    
    `calc` -> `sort`


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