github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/plan/function/builtin/binary/show_visible_bin.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 binary
    16  
    17  import (
    18  	"fmt"
    19  	"github.com/matrixorigin/matrixone/pkg/common/moerr"
    20  	"github.com/matrixorigin/matrixone/pkg/container/types"
    21  	"github.com/matrixorigin/matrixone/pkg/container/vector"
    22  	"github.com/matrixorigin/matrixone/pkg/pb/plan"
    23  	"github.com/matrixorigin/matrixone/pkg/vm/process"
    24  )
    25  
    26  const (
    27  	onUpdateExpr = iota
    28  	defaultExpr
    29  	typNormal
    30  	typWithLen
    31  )
    32  
    33  func ShowVisibleBin(vec []*vector.Vector, proc *process.Process) (*vector.Vector, error) {
    34  	if !vec[1].IsScalar() {
    35  		return nil, moerr.NewInvalidInput(proc.Ctx, "show visible bin, the second argument must be a scalar")
    36  	}
    37  	var err error
    38  	tpSlice := vector.MustTCols[uint8](vec[1])
    39  	srcSlice := vector.MustBytesCols(vec[0])
    40  	tp := tpSlice[0]
    41  	resultVec := vector.New(types.T_varchar.ToType())
    42  	defer func() {
    43  		if err != nil {
    44  			resultVec.Free(proc.Mp())
    45  		}
    46  	}()
    47  	var ret []string
    48  	switch tp {
    49  	case onUpdateExpr:
    50  		ret, err = showExpr(srcSlice, byOnUpdate)
    51  	case defaultExpr:
    52  		ret, err = showExpr(srcSlice, byDefault)
    53  	case typNormal:
    54  		ret, err = showType(srcSlice, false)
    55  	case typWithLen:
    56  		ret, err = showType(srcSlice, true)
    57  	default:
    58  		return nil, moerr.NewNotSupported(proc.Ctx, fmt.Sprintf("show visible bin, the second argument must be in [0, 3], but got %d", tp))
    59  	}
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  	for i := range ret {
    64  		err = resultVec.Append([]byte(ret[i]), len(ret[i]) == 0, proc.Mp())
    65  		if err != nil {
    66  			return nil, err
    67  		}
    68  	}
    69  	return resultVec, nil
    70  }
    71  
    72  func showType(s [][]byte, showLen bool) ([]string, error) {
    73  	ret := make([]string, len(s))
    74  	for i := range s {
    75  		tp := new(types.Type)
    76  		err := types.Decode(s[i], tp)
    77  		if err != nil {
    78  			return nil, err
    79  		}
    80  		if showLen {
    81  			ret[i] = fmt.Sprintf("%s(%d)", tp.String(), tp.Width)
    82  		} else {
    83  			ret[i] = tp.String()
    84  		}
    85  	}
    86  	return ret, nil
    87  }
    88  
    89  func byOnUpdate(s []byte) (string, error) {
    90  	if len(s) == 0 {
    91  		return "", nil
    92  	}
    93  	update := new(plan.OnUpdate)
    94  	err := types.Decode(s, update)
    95  	if err != nil {
    96  		return "", err
    97  	}
    98  	return update.OriginString, nil
    99  }
   100  func byDefault(s []byte) (string, error) {
   101  	if len(s) == 0 {
   102  		return "", nil
   103  	}
   104  	def := new(plan.Default)
   105  	err := types.Decode(s, def)
   106  	if err != nil {
   107  		return "", err
   108  	}
   109  	return def.OriginString, nil
   110  }
   111  
   112  func showExpr(s [][]byte, fn func(ss []byte) (string, error)) ([]string, error) {
   113  	ret := make([]string, len(s))
   114  	var err error
   115  	for i := range s {
   116  		ret[i], err = fn(s[i])
   117  		if err != nil {
   118  			return nil, err
   119  		}
   120  	}
   121  	return ret, nil
   122  }