github.com/matrixorigin/matrixone@v1.2.0/pkg/sql/colexec/projection/projection.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 projection
    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/sql/colexec"
    23  	"github.com/matrixorigin/matrixone/pkg/sql/plan"
    24  	"github.com/matrixorigin/matrixone/pkg/vm"
    25  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    26  )
    27  
    28  const argName = "projection"
    29  
    30  func (arg *Argument) String(buf *bytes.Buffer) {
    31  	buf.WriteString(argName)
    32  	n := arg
    33  	buf.WriteString(": projection(")
    34  	for i, e := range n.Es {
    35  		if i > 0 {
    36  			buf.WriteString(",")
    37  		}
    38  		buf.WriteString(e.String())
    39  	}
    40  	buf.WriteString(")")
    41  }
    42  
    43  func (arg *Argument) Prepare(proc *process.Process) (err error) {
    44  	ap := arg
    45  	ap.ctr = new(container)
    46  	ap.ctr.projExecutors, err = colexec.NewExpressionExecutorsFromPlanExpressions(proc, ap.Es)
    47  	ap.ctr.uafs = make([]func(v *vector.Vector, w *vector.Vector) error, len(ap.Es))
    48  	for i, e := range ap.Es {
    49  		if e.Typ.Id != 0 {
    50  			ap.ctr.uafs[i] = vector.GetUnionAllFunction(plan.MakeTypeByPlan2Expr(e), proc.Mp())
    51  		}
    52  	}
    53  	return err
    54  }
    55  
    56  func (arg *Argument) Call(proc *process.Process) (vm.CallResult, error) {
    57  	if err, isCancel := vm.CancelCheck(proc); isCancel {
    58  		return vm.CancelResult, err
    59  	}
    60  
    61  	result, err := arg.GetChildren(0).Call(proc)
    62  	if err != nil {
    63  		return result, err
    64  	}
    65  
    66  	anal := proc.GetAnalyze(arg.GetIdx(), arg.GetParallelIdx(), arg.GetParallelMajor())
    67  	anal.Start()
    68  	defer anal.Stop()
    69  
    70  	if result.Batch == nil || result.Batch.IsEmpty() || result.Batch.Last() {
    71  		return result, nil
    72  	}
    73  	bat := result.Batch
    74  	anal.Input(bat, arg.GetIsFirst())
    75  
    76  	if arg.buf != nil {
    77  		proc.PutBatch(arg.buf)
    78  		arg.buf = nil
    79  	}
    80  
    81  	arg.buf = batch.NewWithSize(len(arg.Es))
    82  	// keep shuffleIDX unchanged
    83  	arg.buf.ShuffleIDX = bat.ShuffleIDX
    84  	// do projection.
    85  	for i := range arg.ctr.projExecutors {
    86  		vec, err := arg.ctr.projExecutors[i].Eval(proc, []*batch.Batch{bat})
    87  		if err != nil {
    88  			for _, newV := range arg.buf.Vecs {
    89  				if newV != nil {
    90  					for k, oldV := range bat.Vecs {
    91  						if oldV != nil && newV == oldV {
    92  							bat.Vecs[k] = nil
    93  						}
    94  					}
    95  				}
    96  			}
    97  			arg.buf = nil
    98  			return result, err
    99  		}
   100  		arg.buf.Vecs[i] = vec
   101  	}
   102  
   103  	newAlloc, err := colexec.FixProjectionResult(proc, arg.ctr.projExecutors, arg.ctr.uafs, arg.buf, bat)
   104  	if err != nil {
   105  		return result, err
   106  	}
   107  	arg.maxAllocSize = max(arg.maxAllocSize, newAlloc)
   108  	arg.buf.SetRowCount(bat.RowCount())
   109  
   110  	anal.Output(arg.buf, arg.GetIsLast())
   111  	result.Batch = arg.buf
   112  	return result, nil
   113  }