ASF GitHub Bot commented on FLINK-6968:

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

    --- Diff: 
    @@ -0,0 +1,175 @@
    + * 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
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    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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    +package org.apache.flink.table.sinks
    +import java.lang.{Boolean => JBool}
    +import org.apache.flink.api.common.state.{ValueState, ValueStateDescriptor}
    +import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.api.java.functions.KeySelector
    +import org.apache.flink.api.java.tuple.{Tuple2 => JTuple2}
    +import org.apache.flink.api.java.typeutils.{ResultTypeQueryable, 
    +import org.apache.flink.configuration.Configuration
    +import org.apache.flink.streaming.api.datastream.DataStream
    +import org.apache.flink.streaming.api.functions.ProcessFunction
    +import org.apache.flink.table.api.StreamQueryConfig
    +import org.apache.flink.types.Row
    +import org.apache.flink.util.Collector
    +import org.slf4j.LoggerFactory
    --- End diff --
    Remove unused imports.

> Store streaming, updating tables with unique key in queryable state
> -------------------------------------------------------------------
>                 Key: FLINK-6968
>                 URL: https://issues.apache.org/jira/browse/FLINK-6968
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Fabian Hueske
>            Assignee: Renjie Liu
>            Priority: Major
> Streaming tables with unique key are continuously updated. For example 
> queries with a non-windowed aggregation generate such tables. Commonly, such 
> updating tables are emitted via an upsert table sink to an external datastore 
> (k-v store, database) to make it accessible to applications.
> This issue is about adding a feature to store and maintain such a table as 
> queryable state in Flink. By storing the table in Flnk's queryable state, we 
> do not need an external data store to access the results of the query but can 
> query the results directly from Flink.

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