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https://issues.apache.org/jira/browse/FLINK-3850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902054#comment-15902054
]
ASF GitHub Bot commented on FLINK-3850:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3040#discussion_r105029771
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/dataset/forwarding/FieldForwardingUtils.scala
---
@@ -0,0 +1,143 @@
+/*
+ * 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.nodes.dataset.forwarding
+
+import org.apache.flink.api.common.typeinfo.{BasicArrayTypeInfo,
BasicTypeInfo, TypeInformation => TypeInfo}
+import org.apache.flink.api.common.typeutils.CompositeType
+import org.apache.flink.api.java.DataSet
+import org.apache.flink.table.api.TableException
+import org.apache.flink.types.Row
+
+object FieldForwardingUtils {
+
+ def compositeTypeField = (fields: Seq[(String, TypeInfo[_])]) => fields
+
+ private def throwMissedWrapperException(customWrapper: TypeInfo[_]) = {
+ throw new TableException(s"Implementation for $customWrapper wrapper
is missing.")
+ }
+
+ /**
+ * Wrapper for {@link getForwardedFields}
+ */
+ def getForwardedInput(
+ inputType: TypeInfo[_],
+ outputType: TypeInfo[_],
+ forwardIndices: Seq[Int],
+ customWrapper: TypeInfo[_] =>
+ Seq[(String, TypeInfo[_])] = throwMissedWrapperException): String
= {
+
+ getForwardedFields(inputType,
+ outputType,
+ forwardIndices.zip(forwardIndices),
+ customWrapper)
+ }
+
+ /**
+ * Wraps provided indices with proper names.
+ * e.g. _1 for Tuple, f0 for Row, fieldName for POJO and named Row
+ *
+ * @param inputType information of input data
+ * @param outputType information of output data
+ * @param forwardIndices tuple of (input, output) indices of a
forwarded field
+ * @param customWrapper used for figuring out proper type in specific
cases,
+ * e.g. {@see DataSetSingleRowJoin}
+ * @return string with forwarded fields mapped from input to output
+ */
+ def getForwardedFields(
+ inputType: TypeInfo[_],
+ outputType: TypeInfo[_],
+ forwardIndices: Seq[(Int, Int)],
+ customWrapper: TypeInfo[_] =>
--- End diff --
I didn't notice that the `customWrapper` was used. Can it be removed?
> Add forward field annotations to DataSet operators generated by the Table API
> -----------------------------------------------------------------------------
>
> Key: FLINK-3850
> URL: https://issues.apache.org/jira/browse/FLINK-3850
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Fabian Hueske
> Assignee: Nikolay Vasilishin
>
> The DataSet API features semantic annotations [1] to hint the optimizer which
> input fields an operator copies. This information is valuable for the
> optimizer because it can infer that certain physical properties such as
> partitioning or sorting are not destroyed by user functions and thus generate
> more efficient execution plans.
> The Table API is built on top of the DataSet API and generates DataSet
> programs and code for user-defined functions. Hence, it knows exactly which
> fields are modified and which not. We should use this information to
> automatically generate forward field annotations and attach them to the
> operators. This can help to significantly improve the performance of certain
> jobs.
> [1]
> https://ci.apache.org/projects/flink/flink-docs-release-1.0/apis/batch/index.html#semantic-annotations
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