github.com/rohankumardubey/aresdb@v0.0.2-0.20190517170215-e54e3ca06b9c/query/sql/tree/SimpleGroupBy.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  import (
    18  	"fmt"
    19  
    20  	"github.com/uber/aresdb/query/sql/util"
    21  )
    22  
    23  // SimpleGroupBy is group by
    24  type SimpleGroupBy struct {
    25  	IGroupingElement
    26  	// Columns is group by columns
    27  	Columns []IExpression
    28  }
    29  
    30  // NewSimpleGroupBy creates SimpleGroupBy
    31  func NewSimpleGroupBy(location *NodeLocation, expressions []IExpression) *SimpleGroupBy {
    32  	errMsg := fmt.Sprintf("simpleGroupByExpressions is null at (line:%d, col:%d)", location.Line, location.CharPosition)
    33  	util.RequireNonNull(expressions, errMsg)
    34  	return &SimpleGroupBy{
    35  		NewGroupingElement(location),
    36  		expressions,
    37  	}
    38  }
    39  
    40  // Accept accepts visitor
    41  func (q *SimpleGroupBy) Accept(visitor AstVisitor, ctx interface{}) interface{} {
    42  	return visitor.VisitSimpleGroupBy(q, ctx)
    43  }