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Date: Fri, 18 Nov 2016 20:38:00 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (FLINK-4294) Allow access of composite type
 fields
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archived-at: Fri, 18 Nov 2016 20:38:01 -0000


    [ https://issues.apache.org/jira/browse/FLINK-4294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15677686#comment-15677686 ] 

ASF GitHub Bot commented on FLINK-4294:
---------------------------------------

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

    https://github.com/apache/flink/pull/2319#discussion_r88683102
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/expressions/composite.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.expressions
    +
    +import org.apache.calcite.rex.RexNode
    +import org.apache.calcite.tools.RelBuilder
    +import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.api.common.typeutils.CompositeType
    +import org.apache.flink.api.table.UnresolvedException
    +import org.apache.flink.api.table.validate.{ExprValidationResult, ValidationFailure, ValidationSuccess}
    +
    +
    +case class Flattening(child: Expression) extends UnaryExpression {
    +
    +  override def toString = s"$child.flatten()"
    +
    +  override private[flink] def resultType: TypeInformation[_] =
    +    throw UnresolvedException(s"Invalid call to on ${this.getClass}.")
    --- End diff --
    
    Please check exception message.


> Allow access of composite type fields
> -------------------------------------
>
>                 Key: FLINK-4294
>                 URL: https://issues.apache.org/jira/browse/FLINK-4294
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>
> Currently all Flink CompositeTypes are treated as GenericRelDataTypes. It would be better to access individual fields of composite types, too. e.g.
> {code}
> SELECT composite.name FROM composites
> SELECT tuple.f0 FROM tuples
> 'f0.getField(0)
> {code}


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