github.com/XiaoMi/Gaea@v1.2.5/proxy/plan/decorator_binary_operation_expr.go (about)

     1  // Copyright 2019 The Gaea 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 plan
    16  
    17  import (
    18  	"github.com/XiaoMi/Gaea/parser/ast"
    19  	driver "github.com/XiaoMi/Gaea/parser/tidb-types/parser_driver"
    20  )
    21  
    22  // BinaryOperationFieldtype declares field type of binary operation
    23  type BinaryOperationFieldtype int
    24  
    25  // Expr type
    26  const (
    27  	UnsupportExpr BinaryOperationFieldtype = iota
    28  	ValueExpr
    29  	ColumnNameExpr
    30  	FuncCallExpr
    31  )
    32  
    33  func getExprNodeTypeInBinaryOperation(n ast.ExprNode) BinaryOperationFieldtype {
    34  	switch n.(type) {
    35  	case *ast.ColumnNameExpr:
    36  		return ColumnNameExpr
    37  	case *driver.ValueExpr:
    38  		return ValueExpr
    39  	case *ast.FuncCallExpr:
    40  		return FuncCallExpr
    41  	default:
    42  		return UnsupportExpr
    43  	}
    44  }