github.com/matrixorigin/matrixone@v1.2.0/pkg/sql/colexec/output/output.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 output
    16  
    17  import (
    18  	"bytes"
    19  
    20  	"github.com/matrixorigin/matrixone/pkg/vm"
    21  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    22  )
    23  
    24  const argName = "output"
    25  
    26  func (arg *Argument) String(buf *bytes.Buffer) {
    27  	buf.WriteString(argName)
    28  	buf.WriteString(": sql output")
    29  }
    30  
    31  func (arg *Argument) Prepare(_ *process.Process) error {
    32  	return nil
    33  }
    34  
    35  func (arg *Argument) Call(proc *process.Process) (vm.CallResult, error) {
    36  	if err, isCancel := vm.CancelCheck(proc); isCancel {
    37  		return vm.CancelResult, err
    38  	}
    39  
    40  	ap := arg
    41  	result, err := arg.GetChildren(0).Call(proc)
    42  	if err != nil {
    43  		return result, err
    44  	}
    45  
    46  	anal := proc.GetAnalyze(arg.GetIdx(), arg.GetParallelIdx(), arg.GetParallelMajor())
    47  	anal.Start()
    48  	defer anal.Stop()
    49  
    50  	if result.Batch == nil {
    51  		result.Status = vm.ExecStop
    52  		return result, nil
    53  	}
    54  
    55  	if result.Batch.IsEmpty() {
    56  		return result, nil
    57  	}
    58  	bat := result.Batch
    59  
    60  	if err := ap.Func(bat); err != nil {
    61  		result.Status = vm.ExecStop
    62  		return result, err
    63  	}
    64  	return result, nil
    65  }