Github user fhueske commented on a diff in the pull request:
    --- Diff: 
    @@ -0,0 +1,275 @@
    + * 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
    + *
    + *
    + *
    + * 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.runtime.join
    +import org.apache.flink.api.common.functions.RichFlatJoinFunction
    +import org.apache.flink.api.common.state._
    +import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.configuration.Configuration
    +import org.apache.flink.table.api.{StreamQueryConfig, Types}
    +import org.apache.flink.table.runtime.CRowWrappingMultiOuputCollector
    +import org.apache.flink.table.runtime.types.CRow
    +import org.apache.flink.types.Row
    +import org.apache.flink.util.Collector
    +import{Tuple2 => JTuple2}
    +  * Connect data for left stream and right stream. Only use for innerJoin.
    +  *
    +  * @param joiner           join function
    +  * @param leftType         the input type of left stream
    +  * @param rightType        the input type of right stream
    +  * @param resultType       the output type of join
    +  * @param queryConfig
    +  */
    +class ProcTimeNonWindowInnerJoin(
    +    joiner: RichFlatJoinFunction[Row, Row, Row],
    --- End diff --
    We can directly compile and call the code-gen'd `FlatJoinFunction` and 
avoid an additional wrapping layer

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