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offset.go
79 lines (69 loc) · 2.12 KB
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offset.go
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// Copyright 2021 Matrix Origin
//
// 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.
package offset
import (
"bytes"
"fmt"
"github.com/matrixorigin/matrixone/pkg/container/batch"
"github.com/matrixorigin/matrixone/pkg/vm"
"github.com/matrixorigin/matrixone/pkg/vm/process"
)
const argName = "offset"
func (arg *Argument) String(buf *bytes.Buffer) {
buf.WriteString(argName)
n := arg
buf.WriteString(fmt.Sprintf("offset(%v)", n.Offset))
}
func (arg *Argument) Prepare(_ *process.Process) error {
return nil
}
func (arg *Argument) Call(proc *process.Process) (vm.CallResult, error) {
if err, isCancel := vm.CancelCheck(proc); isCancel {
return vm.CancelResult, err
}
result, err := arg.GetChildren(0).Call(proc)
if err != nil {
return result, err
}
if result.Batch == nil || result.Batch.IsEmpty() || result.Batch.Last() {
return result, nil
}
bat := result.Batch
anal := proc.GetAnalyze(arg.GetIdx(), arg.GetParallelIdx(), arg.GetParallelMajor())
anal.Start()
defer anal.Stop()
anal.Input(bat, arg.GetIsFirst())
if arg.Seen > arg.Offset {
return result, nil
}
length := bat.RowCount()
if arg.Seen+uint64(length) > arg.Offset {
sels := newSels(int64(arg.Offset-arg.Seen), int64(length)-int64(arg.Offset-arg.Seen), proc)
arg.Seen += uint64(length)
bat.Shrink(sels, false)
proc.Mp().PutSels(sels)
result.Batch = bat
return result, nil
}
arg.Seen += uint64(length)
result.Batch = batch.EmptyBatch
return result, nil
}
func newSels(start, count int64, proc *process.Process) []int64 {
sels := proc.Mp().GetSels()
for i := int64(0); i < count; i++ {
sels = append(sels, start+i)
}
return sels[:count]
}