github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/plan/function/builtin/multi/regular_substr.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/types"
    19  	"github.com/matrixorigin/matrixone/pkg/container/vector"
    20  	"github.com/matrixorigin/matrixone/pkg/vectorize/regular"
    21  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    22  )
    23  
    24  func RegularSubstr(vectors []*vector.Vector, proc *process.Process) (*vector.Vector, error) {
    25  	firstVector := vectors[0]
    26  	secondVector := vectors[1]
    27  	firstValues := vector.MustStrCols(firstVector)
    28  	secondValues := vector.MustStrCols(secondVector)
    29  	resultType := types.T_varchar.ToType()
    30  
    31  	//maxLen
    32  	maxLen := vector.Length(vectors[0])
    33  	for i := range vectors {
    34  		val := vector.Length(vectors[i])
    35  		if val > maxLen {
    36  			maxLen = val
    37  		}
    38  	}
    39  
    40  	//optional arguments
    41  	var pos []int64
    42  	var occ []int64
    43  	var match_type []string
    44  
    45  	//different parameter length conditions
    46  	switch len(vectors) {
    47  	case 2:
    48  		pos = []int64{1}
    49  		occ = []int64{1}
    50  		match_type = []string{"c"}
    51  
    52  	case 3:
    53  		pos = vector.MustTCols[int64](vectors[2])
    54  		occ = []int64{1}
    55  		match_type = []string{"c"}
    56  	case 4:
    57  		pos = vector.MustTCols[int64](vectors[2])
    58  		occ = vector.MustTCols[int64](vectors[3])
    59  		match_type = []string{"c"}
    60  	}
    61  
    62  	if firstVector.IsScalarNull() || secondVector.IsScalarNull() {
    63  		return proc.AllocScalarNullVector(resultType), nil
    64  	}
    65  
    66  	resultVector, err := proc.AllocVectorOfRows(resultType, 0, nil)
    67  	if err != nil {
    68  		return nil, err
    69  	}
    70  	err = regular.RegularSubstrWithArrays(firstValues, secondValues, pos, occ, match_type, firstVector.Nsp, secondVector.Nsp, resultVector, proc, maxLen)
    71  	if err != nil {
    72  		return nil, err
    73  	}
    74  	return resultVector, nil
    75  }