github.com/matrixorigin/matrixone@v0.7.0/pkg/vm/engine/tae/mergesort/func.go (about)

     1  // Copyright 2021 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package mergesort
    16  
    17  import (
    18  	"github.com/matrixorigin/matrixone/pkg/vm/engine/tae/containers"
    19  )
    20  
    21  func Shuffle(col containers.Vector, idx []uint32) containers.Vector {
    22  	ret := containers.MakeVector(col.GetType(), col.Nullable())
    23  	for _, j := range idx {
    24  		ret.Append(col.Get(int(j)))
    25  	}
    26  	col.Close()
    27  	return ret
    28  }
    29  
    30  func Multiplex(col []containers.Vector, src []uint32, fromLayout, toLayout []uint32) (ret []containers.Vector) {
    31  	ret = make([]containers.Vector, len(toLayout))
    32  	cursors := make([]int, len(fromLayout))
    33  
    34  	k := 0
    35  	for i := 0; i < len(toLayout); i++ {
    36  		ret[i] = containers.MakeVector(col[0].GetType(), col[0].Nullable())
    37  		for j := 0; j < int(toLayout[i]); j++ {
    38  			s := src[k]
    39  			ret[i].Append(col[s].Get(cursors[s]))
    40  			cursors[s]++
    41  			k++
    42  		}
    43  	}
    44  
    45  	for _, v := range col {
    46  		v.Close()
    47  	}
    48  	return
    49  }