github.com/matrixorigin/matrixone@v0.7.0/pkg/vm/engine/tae/moengine/block.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 moengine
    16  
    17  import (
    18  	"bytes"
    19  
    20  	"github.com/matrixorigin/matrixone/pkg/container/batch"
    21  	"github.com/matrixorigin/matrixone/pkg/container/vector"
    22  	"github.com/matrixorigin/matrixone/pkg/vm/engine/tae/catalog"
    23  	"github.com/matrixorigin/matrixone/pkg/vm/engine/tae/containers"
    24  	"github.com/matrixorigin/matrixone/pkg/vm/engine/tae/iface/handle"
    25  	"github.com/matrixorigin/matrixone/pkg/vm/engine/tae/model"
    26  )
    27  
    28  func newBlock(h handle.Block) *txnBlock {
    29  	return &txnBlock{
    30  		handle: h,
    31  	}
    32  }
    33  
    34  func (blk *txnBlock) Read(attrs []string, compressed []*bytes.Buffer, deCompressed []*bytes.Buffer) (*batch.Batch, error) {
    35  	var view *model.BlockView
    36  	var err error
    37  	bat := batch.New(true, attrs)
    38  	bat.Vecs = make([]*vector.Vector, len(attrs))
    39  	view, err = blk.handle.GetColumnDataByNames(attrs, deCompressed)
    40  	if err != nil {
    41  		return nil, err
    42  	}
    43  	view.ApplyDeletes()
    44  	nameIdx := blk.handle.GetMeta().(*catalog.BlockEntry).GetSchema().NameIndex
    45  	for i, attr := range attrs {
    46  		colIdx := nameIdx[attr]
    47  		vec := view.GetColumnData(colIdx)
    48  		if vec.Allocated() > 0 {
    49  			bat.Vecs[i] = containers.CopyToMoVec(vec)
    50  		} else {
    51  			bat.Vecs[i] = containers.UnmarshalToMoVec(vec)
    52  		}
    53  	}
    54  	view.Close()
    55  	return bat, nil
    56  }