github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/plan/function/builtin/multi/timestampdiff.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/datediff"
    21  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    22  )
    23  
    24  func TimeStampDiff(vectors []*vector.Vector, proc *process.Process) (*vector.Vector, error) {
    25  	//input vectors
    26  	firstVector := vectors[0]
    27  	secondVector := vectors[1]
    28  	thirdVector := vectors[2]
    29  	firstValues := vector.MustStrCols(firstVector)
    30  	secondValues := vector.MustTCols[types.Datetime](secondVector)
    31  	thirdValues := vector.MustTCols[types.Datetime](thirdVector)
    32  	resultType := types.T_int64.ToType()
    33  
    34  	//the max Length of all vectors
    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  	if firstVector.IsScalarNull() || secondVector.IsScalarNull() || thirdVector.IsScalarNull() {
    44  		return proc.AllocScalarNullVector(resultType), nil
    45  	}
    46  
    47  	resultVector, err := proc.AllocVectorOfRows(resultType, int64(maxLen), nil)
    48  	if err != nil {
    49  		return nil, err
    50  	}
    51  	resultValues := vector.MustTCols[int64](resultVector)
    52  	err = datediff.TimeStampDiffWithCols(firstValues, secondValues, thirdValues, firstVector.Nsp, secondVector.Nsp, thirdVector.Nsp, resultVector.Nsp, resultValues, maxLen)
    53  	if err != nil {
    54  		return nil, err
    55  	}
    56  	return resultVector, nil
    57  }