github.com/rohankumardubey/aresdb@v0.0.2-0.20190517170215-e54e3ca06b9c/query/sql/tree/SingleColumn.go (about)

     1  //  Copyright (c) 2017-2018 Uber Technologies, 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 tree
    16  
    17  // SingleColumn is select SingleColumn
    18  type SingleColumn struct {
    19  	// SelectItem is interface
    20  	ISelectItem
    21  	// Alias is column alias
    22  	Alias *Identifier
    23  	// Expression is IExpression
    24  	Expression IExpression
    25  }
    26  
    27  // NewSingleColumn creates SingleColumn
    28  func NewSingleColumn(location *NodeLocation, expr IExpression, alias *Identifier) *SingleColumn {
    29  	return &SingleColumn{
    30  		NewSelectItem(location),
    31  		alias,
    32  		expr,
    33  	}
    34  }
    35  
    36  // Accept accepts visitor
    37  func (q *SingleColumn) Accept(visitor AstVisitor, ctx interface{}) interface{} {
    38  	return visitor.VisitSingleColumn(q, ctx)
    39  }