github.com/matrixorigin/matrixone@v0.7.0/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 "unsafe"
    18  
    19  const (
    20  	kInitialCellCntBits = 10
    21  	kInitialCellCnt     = 1 << kInitialCellCntBits
    22  
    23  	kLoadFactorNumerator   = 1
    24  	kLoadFactorDenominator = 2
    25  
    26  	//kTwoLevelBucketCntBits = 8
    27  	//kTwoLevelBucketCnt     = 1 << kTwoLevelBucketCntBits
    28  	//kMaxTwoLevelBucketCnt  = kTwoLevelBucketCnt - 1
    29  )
    30  
    31  type Aggregator interface {
    32  	StateSize() uint8
    33  	ResultSize() uint8
    34  	NeedsInit() bool
    35  
    36  	Init(state unsafe.Pointer)
    37  	AddBatch(states []unsafe.Pointer, values unsafe.Pointer)
    38  	MergeBatch(lstates, rstates []unsafe.Pointer)
    39  
    40  	Finalize(states, results []unsafe.Pointer)
    41  }