github.com/dolthub/go-mysql-server@v0.18.0/sql/expression/namedliteral.go (about)

     1  // Copyright 2022 Dolthub, Inc.
     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 expression
    16  
    17  import (
    18  	"github.com/dolthub/go-mysql-server/sql"
    19  )
    20  
    21  // NamedLiteral represents a literal value, but returns the name field rather than the value for String.
    22  type NamedLiteral struct {
    23  	*Literal
    24  	Name string
    25  }
    26  
    27  var _ sql.Expression = NamedLiteral{}
    28  var _ sql.Expression2 = NamedLiteral{}
    29  var _ sql.CollationCoercible = NamedLiteral{}
    30  
    31  // NewNamedLiteral returns a new NamedLiteral.
    32  func NewNamedLiteral(name string, value interface{}, fieldType sql.Type) NamedLiteral {
    33  	return NamedLiteral{
    34  		Literal: NewLiteral(value, fieldType),
    35  		Name:    name,
    36  	}
    37  }
    38  
    39  // String implements the interface sql.Expression.
    40  func (lit NamedLiteral) String() string {
    41  	return lit.Name
    42  }