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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3849) Add FilterableTableSource interface and translation rule
Date Wed, 15 Mar 2017 13:18:44 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15926154#comment-15926154
] 

ASF GitHub Bot commented on FLINK-3849:
---------------------------------------

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

    https://github.com/apache/flink/pull/3520#discussion_r106140654
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/sources/FilterableTableSource.scala
---
    @@ -0,0 +1,66 @@
    +/*
    + * 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.sources
    +
    +import org.apache.flink.table.expressions.Expression
    +
    +/**
    +  * Adds support for filtering push-down to a [[TableSource]].
    +  * A [[TableSource]] extending this interface is able to filter records before returning.
    +  */
    +trait FilterableTableSource[T] extends TableSource[T] {
    --- End diff --
    
    Why do we need to extend `TableSource`? (see also comment on `ProjectableTableSource`)


> Add FilterableTableSource interface and translation rule
> --------------------------------------------------------
>
>                 Key: FLINK-3849
>                 URL: https://issues.apache.org/jira/browse/FLINK-3849
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Fabian Hueske
>            Assignee: Kurt Young
>
> Add a {{FilterableTableSource}} interface for {{TableSource}} implementations which support
filter push-down.
> The interface could look as follows
> {code}
> def trait FilterableTableSource {
>   // returns unsupported predicate expression
>   def setPredicate(predicate: Expression): Expression
> }
> {code}
> In addition we need Calcite rules to push a predicate (or parts of it) into a TableScan
that refers to a {{FilterableTableSource}}. We might need to tweak the cost model as well
to push the optimizer in the right direction.



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