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https://issues.apache.org/jira/browse/FLINK-6149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953346#comment-15953346
]
ASF GitHub Bot commented on FLINK-6149:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3594#discussion_r109262207
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/rel/logical/FlinkLogicalSort.scala
---
@@ -0,0 +1,148 @@
+/*
+ * 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.rel.logical
+
+import org.apache.calcite.plan._
+import org.apache.calcite.rel.RelFieldCollation.Direction
+import org.apache.calcite.rel.convert.ConverterRule
+import org.apache.calcite.rel.core.Sort
+import org.apache.calcite.rel.logical.LogicalSort
+import org.apache.calcite.rel.metadata.RelMetadataQuery
+import org.apache.calcite.rel.{RelCollation, RelNode, RelWriter}
+import org.apache.calcite.rex.{RexLiteral, RexNode}
+import org.apache.flink.api.common.operators.Order
+import org.apache.flink.table.rel.FlinkConventions
+
+import scala.collection.JavaConverters._
+
+class FlinkLogicalSort(
+ cluster: RelOptCluster,
+ traits: RelTraitSet,
+ child: RelNode,
+ collation: RelCollation,
+ offset: RexNode,
+ fetch: RexNode)
+ extends Sort(cluster, traits, child, collation, offset, fetch)
+ with FlinkLogicalRel {
+
+ private val limitStart: Long = if (offset != null) {
+ RexLiteral.intValue(offset)
+ } else {
+ 0L
+ }
+
+ private val limitEnd: Long = if (fetch != null) {
+ RexLiteral.intValue(fetch) + limitStart
+ } else {
+ Long.MaxValue
+ }
+
+ val getOffset: RexNode = offset
+
+ val getFetch: RexNode = fetch
+
+ override def copy(
+ traitSet: RelTraitSet,
+ newInput: RelNode,
+ newCollation: RelCollation,
+ offset: RexNode,
+ fetch: RexNode): Sort = {
+
+ new FlinkLogicalSort(cluster, traitSet, newInput, newCollation,
offset, fetch)
+ }
+
+ override def estimateRowCount(metadata: RelMetadataQuery): Double = {
+ val inputRowCnt = metadata.getRowCount(this.getInput)
+ if (inputRowCnt == null) {
+ inputRowCnt
+ } else {
+ val rowCount = (inputRowCnt - limitStart).max(1.0)
+ if (fetch != null) {
+ val limit = RexLiteral.intValue(fetch)
+ rowCount.min(limit)
+ } else {
+ rowCount
+ }
+ }
+ }
+
+ override def computeSelfCost(planner: RelOptPlanner, mq:
RelMetadataQuery): RelOptCost = {
+ // by default, assume cost is proportional to number of rows
+ val rowCount: Double = mq.getRowCount(this)
+ planner.getCostFactory.makeCost(rowCount, rowCount, 0)
+ }
+
+ override def explainTerms(pw: RelWriter) : RelWriter = {
--- End diff --
the other `FlinkLogical` nodes do not implement `explainTerms()`
> add additional flink logical relation nodes
> -------------------------------------------
>
> Key: FLINK-6149
> URL: https://issues.apache.org/jira/browse/FLINK-6149
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Kurt Young
> Assignee: Kurt Young
>
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