github.com/vescale/zgraph@v0.0.0-20230410094002-959c02d50f95/planner/result_columns.go (about)

     1  // Copyright 2023 zGraph Authors. All rights reserved.
     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 planner
    16  
    17  import (
    18  	"github.com/vescale/zgraph/parser/model"
    19  	"github.com/vescale/zgraph/types"
    20  )
    21  
    22  type ResultColumn struct {
    23  	Name   model.CIStr
    24  	Type   types.T
    25  	Hidden bool
    26  }
    27  
    28  type ResultColumns []ResultColumn
    29  
    30  func (r ResultColumns) FindColumnIndex(name model.CIStr) int {
    31  	for i, col := range r {
    32  		if col.Name.L == name.L {
    33  			return i
    34  		}
    35  	}
    36  	return -1
    37  }
    38  
    39  func ResultColumnsFromSubgraph(sg *Subgraph) ResultColumns {
    40  	var cols ResultColumns
    41  	for _, v := range sg.SingletonVars {
    42  		var colType types.T
    43  		if _, isVertex := sg.Vertices[v.Name.L]; isVertex {
    44  			colType = types.Vertex
    45  		} else {
    46  			colType = types.Edge
    47  		}
    48  		cols = append(cols, ResultColumn{
    49  			Name: v.Name,
    50  			Type: colType,
    51  		})
    52  	}
    53  	return cols
    54  }