github.com/matrixorigin/matrixone@v0.7.0/pkg/sql/plan/binding.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 plan
    16  
    17  import (
    18  	"github.com/matrixorigin/matrixone/pkg/pb/plan"
    19  )
    20  
    21  func (b *Binding) FindColumn(col string) int32 {
    22  	if id, ok := b.colIdByName[col]; ok {
    23  		return id
    24  	}
    25  
    26  	return NotFound
    27  }
    28  
    29  func NewBinding(tag, nodeID int32, table string, cols []string, types []*plan.Type, isClusterTable bool) *Binding {
    30  	binding := &Binding{
    31  		tag:            tag,
    32  		nodeId:         nodeID,
    33  		table:          table,
    34  		cols:           cols,
    35  		types:          types,
    36  		refCnts:        make([]uint, len(cols)),
    37  		isClusterTable: isClusterTable,
    38  	}
    39  
    40  	binding.colIdByName = make(map[string]int32)
    41  	for i, col := range cols {
    42  		if _, ok := binding.colIdByName[col]; ok {
    43  			binding.colIdByName[col] = AmbiguousName
    44  		} else {
    45  			binding.colIdByName[col] = int32(i)
    46  		}
    47  	}
    48  
    49  	return binding
    50  }