text: // Copyright 2022 PingCAP, Ltd.
  //
  // Licensed 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.
  
  #pragma once
  
  #include <DataStreams/IBlockInputStream.h>
  
  
  namespace DB
  {
  
  /** If the number of sources of `inputs` is greater than `width`,
    *  then glues the sources to each other (using ConcatBlockInputStream),
    *  so that the number of sources becomes no more than `width`.
    *
    * Trying to glue the sources with each other uniformly randomly.
    *  (to avoid overweighting if the distribution of the amount of data in different sources is subject to some pattern)
    */
  BlockInputStreams narrowBlockInputStreams(BlockInputStreams & inputs, size_t width);
  
  }
  