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https://issues.apache.org/jira/browse/FLINK-5159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15703159#comment-15703159
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ASF GitHub Bot commented on FLINK-5159:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/2811#discussion_r89884314
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/rules/dataSet/DataSetSingleRowJoinRule.scala
---
@@ -0,0 +1,88 @@
+/*
+ * 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.api.table.plan.rules.dataSet
+
+import org.apache.calcite.plan.volcano.RelSubset
+import org.apache.calcite.plan.{Convention, RelOptRule, RelOptRuleCall}
+import org.apache.calcite.rel.RelNode
+import org.apache.calcite.rel.convert.ConverterRule
+import org.apache.calcite.rel.core.JoinRelType
+import org.apache.calcite.rel.logical.{LogicalAggregate, LogicalJoin}
+import org.apache.flink.api.table.plan.nodes.dataset.{DataSetConvention,
DataSetSingleRowJoin}
+
+import scala.collection.JavaConversions._
--- End diff --
Please remove import.
> Improve perfomance of inner joins with a single row input
> ---------------------------------------------------------
>
> Key: FLINK-5159
> URL: https://issues.apache.org/jira/browse/FLINK-5159
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Alexander Shoshin
> Assignee: Alexander Shoshin
> Priority: Minor
>
> All inner joins (including a cross join) can be implemented as a
> {{MapFunction}} if one of their inputs is a single row. This row can be
> passed to a {{MapFunction}} as a {{BroadcastSet}}.
> This approach is going to be more lightweight than the other current
> strategies.
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