github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/plan/function/builtin/unary/month.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 unary
    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/month"
    21  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    22  )
    23  
    24  func DateToMonth(vectors []*vector.Vector, proc *process.Process) (*vector.Vector, error) {
    25  	inputVector := vectors[0]
    26  	resultType := types.T_uint8.ToType()
    27  	inputValues := vector.MustTCols[types.Date](inputVector)
    28  	if inputVector.IsScalar() {
    29  		if inputVector.ConstVectorIsNull() {
    30  			return proc.AllocScalarNullVector(resultType), nil
    31  		}
    32  		resultValues := make([]uint8, 1)
    33  		month.DateToMonth(inputValues, resultValues)
    34  		return vector.NewConstFixed(resultType, inputVector.Length(), resultValues[0], proc.Mp()), nil
    35  	} else {
    36  		resultVector, err := proc.AllocVectorOfRows(resultType, int64(len(inputValues)), inputVector.Nsp)
    37  		if err != nil {
    38  			return nil, err
    39  		}
    40  		resultValues := vector.MustTCols[uint8](resultVector)
    41  		month.DateToMonth(inputValues, resultValues)
    42  		return resultVector, nil
    43  	}
    44  }
    45  
    46  func DatetimeToMonth(vectors []*vector.Vector, proc *process.Process) (*vector.Vector, error) {
    47  	inputVector := vectors[0]
    48  	resultType := types.Type{Oid: types.T_uint8, Size: 1}
    49  	inputValues := vector.MustTCols[types.Datetime](inputVector)
    50  	if inputVector.IsScalar() {
    51  		if inputVector.ConstVectorIsNull() {
    52  			return proc.AllocScalarNullVector(resultType), nil
    53  		}
    54  		resultVector := vector.NewConst(resultType, 1)
    55  		resultValues := make([]uint8, 1)
    56  		vector.SetCol(resultVector, month.DatetimeToMonth(inputValues, resultValues))
    57  		return resultVector, nil
    58  	} else {
    59  		resultVector, err := proc.AllocVectorOfRows(resultType, int64(len(inputValues)), inputVector.Nsp)
    60  		if err != nil {
    61  			return nil, err
    62  		}
    63  		resultValues := vector.MustTCols[uint8](resultVector)
    64  		month.DatetimeToMonth(inputValues, resultValues)
    65  		return resultVector, nil
    66  	}
    67  }
    68  
    69  func DateStringToMonth(vectors []*vector.Vector, proc *process.Process) (*vector.Vector, error) {
    70  	inputVector := vectors[0]
    71  	resultType := types.Type{Oid: types.T_uint8, Size: 1}
    72  	inputValues := vector.MustStrCols(inputVector)
    73  	if inputVector.IsScalar() {
    74  		if inputVector.ConstVectorIsNull() {
    75  			return proc.AllocScalarNullVector(resultType), nil
    76  		}
    77  		resultVector := vector.NewConst(resultType, 1)
    78  		resultValues := make([]uint8, 1)
    79  		vector.SetCol(resultVector, month.DateStringToMonth(inputValues, resultVector.Nsp, resultValues))
    80  		return resultVector, nil
    81  	} else {
    82  		resultVector, err := proc.AllocVectorOfRows(resultType, int64(len(inputValues)), inputVector.Nsp)
    83  		if err != nil {
    84  			return nil, err
    85  		}
    86  		resultValues := vector.MustTCols[uint8](resultVector)
    87  		month.DateStringToMonth(inputValues, resultVector.Nsp, resultValues)
    88  		return resultVector, nil
    89  	}
    90  }