github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/plan/function/builtin/multi/regular_like.go (about)

     1  // Copyright 2022 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 multi
    16  
    17  import (
    18  	"github.com/matrixorigin/matrixone/pkg/container/nulls"
    19  	"github.com/matrixorigin/matrixone/pkg/container/types"
    20  	"github.com/matrixorigin/matrixone/pkg/container/vector"
    21  	"github.com/matrixorigin/matrixone/pkg/vectorize/regular"
    22  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    23  )
    24  
    25  func RegularLike(vectors []*vector.Vector, proc *process.Process) (*vector.Vector, error) {
    26  	firstVector := vectors[0]
    27  	secondVector := vectors[1]
    28  	firstValues := vector.MustStrCols(firstVector)
    29  	secondValues := vector.MustStrCols(secondVector)
    30  	resultType := types.T_bool.ToType()
    31  
    32  	var thirdNsp *nulls.Nulls
    33  	thirdNsp = nil
    34  	//maxLen
    35  	maxLen := vector.Length(vectors[0])
    36  	for i := range vectors {
    37  		val := vector.Length(vectors[i])
    38  		if val > maxLen {
    39  			maxLen = val
    40  		}
    41  	}
    42  
    43  	//optional arguments
    44  	var match_type []string
    45  
    46  	//different parameter length conditions
    47  	switch len(vectors) {
    48  	case 2:
    49  		match_type = []string{"c"}
    50  	case 3:
    51  		match_type = vector.MustStrCols(vectors[2])
    52  		if vectors[2].IsScalarNull() {
    53  			return proc.AllocScalarNullVector(resultType), nil
    54  		}
    55  		thirdNsp = vectors[2].Nsp
    56  	}
    57  
    58  	if firstVector.IsScalarNull() || secondVector.IsScalarNull() {
    59  		return proc.AllocScalarNullVector(resultType), nil
    60  	}
    61  
    62  	resultVector, err := proc.AllocVectorOfRows(resultType, int64(maxLen), nil)
    63  	if err != nil {
    64  		return nil, err
    65  	}
    66  	resultValues := vector.MustTCols[bool](resultVector)
    67  	err = regular.RegularLikeWithArrays(firstValues, secondValues, match_type, firstVector.Nsp, secondVector.Nsp, thirdNsp, resultVector.Nsp, resultValues, maxLen)
    68  	if err != nil {
    69  		return nil, err
    70  	}
    71  	return resultVector, nil
    72  }