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

     1  // Copyright 2021 - 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  	"fmt"
    19  
    20  	"github.com/matrixorigin/matrixone/pkg/common/moerr"
    21  	"github.com/matrixorigin/matrixone/pkg/container/nulls"
    22  	"github.com/matrixorigin/matrixone/pkg/container/types"
    23  	"github.com/matrixorigin/matrixone/pkg/container/vector"
    24  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    25  	"golang.org/x/exp/constraints"
    26  )
    27  
    28  type mathMultiT interface {
    29  	constraints.Integer | constraints.Float | types.Decimal64 | types.Decimal128
    30  }
    31  
    32  type mathMultiFun[T mathMultiT] func([]T, []T, int64) []T
    33  
    34  func generalMathMulti[T mathMultiT](funName string, vecs []*vector.Vector, proc *process.Process, cb mathMultiFun[T]) (*vector.Vector, error) {
    35  	typ := vecs[0].Typ.Oid.ToType()
    36  	digits := int64(0)
    37  	if len(vecs) > 1 {
    38  		// if vecs[1].IsScalarNull() {
    39  		// 	return proc.AllocScalarNullVector(typ), nil
    40  		// }
    41  		if !vecs[1].IsScalar() || vecs[1].Typ.Oid != types.T_int64 {
    42  			return nil, moerr.NewInvalidArg(proc.Ctx, fmt.Sprintf("the second argument of the %s", funName), "not const")
    43  		}
    44  		digits = vecs[1].Col.([]int64)[0]
    45  	}
    46  	vs := vector.MustTCols[T](vecs[0])
    47  	if vecs[0].IsScalarNull() {
    48  		return proc.AllocScalarNullVector(typ), nil
    49  	}
    50  
    51  	if vecs[0].IsScalar() {
    52  		rs := make([]T, 1)
    53  		ret_rs := cb(vs, rs, digits)
    54  
    55  		vec := vector.NewConstFixed(typ, 1, ret_rs[0], proc.Mp())
    56  		nulls.Set(vec.Nsp, vecs[0].Nsp)
    57  		return vec, nil
    58  	} else {
    59  		rs := make([]T, len(vs))
    60  		ret_rs := cb(vs, rs, digits)
    61  
    62  		vec := vector.NewWithFixed(typ, ret_rs, nulls.NewWithSize(len(ret_rs)), proc.Mp())
    63  		nulls.Set(vec.Nsp, vecs[0].Nsp)
    64  
    65  		return vec, nil
    66  	}
    67  }