github.com/matrixorigin/matrixone@v1.2.0/pkg/container/hashtable/common.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 hashtable
    16  
    17  import (
    18  	"unsafe"
    19  
    20  	"github.com/matrixorigin/matrixone/pkg/common/mpool"
    21  )
    22  
    23  const (
    24  	kInitialCellCntBits = 10
    25  	kInitialCellCnt     = 1 << kInitialCellCntBits
    26  	maxBlockSize        = mpool.GB / 4
    27  )
    28  
    29  func maxElemCnt(cellCnt, cellSize uint64) uint64 {
    30  	if cellCnt*cellSize < maxBlockSize {
    31  		return cellCnt / 2
    32  	} else {
    33  		return cellCnt * 3 / 4
    34  	}
    35  }
    36  
    37  type Aggregator interface {
    38  	StateSize() uint8
    39  	ResultSize() uint8
    40  	NeedsInit() bool
    41  
    42  	Init(state unsafe.Pointer)
    43  	AddBatch(states []unsafe.Pointer, values unsafe.Pointer)
    44  	MergeBatch(lstates, rstates []unsafe.Pointer)
    45  
    46  	Finalize(states, results []unsafe.Pointer)
    47  }