github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/colexec/product/product.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 product
    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/process"
    23  )
    24  
    25  func String(_ any, buf *bytes.Buffer) {
    26  	buf.WriteString(" cross join ")
    27  }
    28  
    29  func Prepare(proc *process.Process, arg any) error {
    30  	ap := arg.(*Argument)
    31  	ap.ctr = new(container)
    32  	return nil
    33  }
    34  
    35  func Call(idx int, proc *process.Process, arg any, isFirst bool, isLast bool) (bool, error) {
    36  	anal := proc.GetAnalyze(idx)
    37  	anal.Start()
    38  	defer anal.Stop()
    39  	ap := arg.(*Argument)
    40  	ctr := ap.ctr
    41  	for {
    42  		switch ctr.state {
    43  		case Build:
    44  			if err := ctr.build(ap, proc, anal); err != nil {
    45  				ap.Free(proc, true)
    46  				return false, err
    47  			}
    48  			ctr.state = Probe
    49  
    50  		case Probe:
    51  			bat := <-proc.Reg.MergeReceivers[0].Ch
    52  			if bat == nil {
    53  				ctr.state = End
    54  				continue
    55  			}
    56  			if len(bat.Zs) == 0 {
    57  				continue
    58  			}
    59  			if ctr.bat == nil {
    60  				bat.Clean(proc.Mp())
    61  				continue
    62  			}
    63  			if err := ctr.probe(bat, ap, proc, anal, isFirst, isLast); err != nil {
    64  				bat.Clean(proc.Mp())
    65  				ap.Free(proc, true)
    66  				return false, err
    67  			}
    68  			return false, nil
    69  
    70  		default:
    71  			ap.Free(proc, false)
    72  			proc.SetInputBatch(nil)
    73  			return true, nil
    74  		}
    75  	}
    76  }
    77  
    78  func (ctr *container) build(ap *Argument, proc *process.Process, anal process.Analyze) error {
    79  	bat := <-proc.Reg.MergeReceivers[1].Ch
    80  	if bat != nil {
    81  		ctr.bat = bat
    82  	}
    83  	return nil
    84  }
    85  
    86  func (ctr *container) probe(bat *batch.Batch, ap *Argument, proc *process.Process, anal process.Analyze, isFirst bool, isLast bool) error {
    87  	defer bat.Clean(proc.Mp())
    88  	anal.Input(bat, isFirst)
    89  	rbat := batch.NewWithSize(len(ap.Result))
    90  	rbat.Zs = proc.Mp().GetSels()
    91  	for i, rp := range ap.Result {
    92  		if rp.Rel == 0 {
    93  			rbat.Vecs[i] = vector.New(bat.Vecs[rp.Pos].Typ)
    94  		} else {
    95  			rbat.Vecs[i] = vector.New(ctr.bat.Vecs[rp.Pos].Typ)
    96  		}
    97  	}
    98  	count := bat.Length()
    99  	for i := 0; i < count; i++ {
   100  		for j := 0; j < len(ctr.bat.Zs); j++ {
   101  			for k, rp := range ap.Result {
   102  				if rp.Rel == 0 {
   103  					if err := vector.UnionOne(rbat.Vecs[k], bat.Vecs[rp.Pos], int64(i), proc.Mp()); err != nil {
   104  						rbat.Clean(proc.Mp())
   105  						return err
   106  					}
   107  				} else {
   108  					if err := vector.UnionOne(rbat.Vecs[k], ctr.bat.Vecs[rp.Pos], int64(j), proc.Mp()); err != nil {
   109  						rbat.Clean(proc.Mp())
   110  						return err
   111  					}
   112  				}
   113  			}
   114  			rbat.Zs = append(rbat.Zs, ctr.bat.Zs[j])
   115  		}
   116  	}
   117  	rbat.ExpandNulls()
   118  	anal.Output(rbat, isLast)
   119  	proc.SetInputBatch(rbat)
   120  	return nil
   121  }