本文整理汇总了Golang中github.com/pingcap/tidb/expression.AggregationFunction.GetName方法的典型用法代码示例。如果您正苦于以下问题：Golang AggregationFunction.GetName方法的具体用法？Golang AggregationFunction.GetName怎么用？Golang AggregationFunction.GetName使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/pingcap/tidb/expression.AggregationFunction的用法示例。
在下文中一共展示了AggregationFunction.GetName方法的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: newAggFuncToPBExpr
func (b *executorBuilder) newAggFuncToPBExpr(client kv.Client, aggFunc expression.AggregationFunction,
tbl *model.TableInfo) *tipb.Expr {
var tp tipb.ExprType
switch aggFunc.GetName() {
case ast.AggFuncCount:
tp = tipb.ExprType_Count
case ast.AggFuncFirstRow:
tp = tipb.ExprType_First
case ast.AggFuncGroupConcat:
tp = tipb.ExprType_GroupConcat
case ast.AggFuncMax:
tp = tipb.ExprType_Max
case ast.AggFuncMin:
tp = tipb.ExprType_Min
case ast.AggFuncSum:
tp = tipb.ExprType_Sum
case ast.AggFuncAvg:
tp = tipb.ExprType_Avg
}
if !client.SupportRequestType(kv.ReqTypeSelect, int64(tp)) {
return nil
}
children := make([]*tipb.Expr, 0, len(aggFunc.GetArgs()))
for _, arg := range aggFunc.GetArgs() {
pbArg := b.newExprToPBExpr(client, arg, tbl)
if pbArg == nil {
return nil
}
children = append(children, pbArg)
}
return &tipb.Expr{Tp: tp.Enum(), Children: children}
}示例2: aggFuncToPBExpr
func aggFuncToPBExpr(sc *variable.StatementContext, client kv.Client, aggFunc expression.AggregationFunction) *tipb.Expr {
pc := pbConverter{client: client, sc: sc}
var tp tipb.ExprType
switch aggFunc.GetName() {
case ast.AggFuncCount:
tp = tipb.ExprType_Count
case ast.AggFuncFirstRow:
tp = tipb.ExprType_First
case ast.AggFuncGroupConcat:
tp = tipb.ExprType_GroupConcat
case ast.AggFuncMax:
tp = tipb.ExprType_Max
case ast.AggFuncMin:
tp = tipb.ExprType_Min
case ast.AggFuncSum:
tp = tipb.ExprType_Sum
case ast.AggFuncAvg:
tp = tipb.ExprType_Avg
}
if !client.SupportRequestType(kv.ReqTypeSelect, int64(tp)) {
return nil
}
children := make([]*tipb.Expr, 0, len(aggFunc.GetArgs()))
for _, arg := range aggFunc.GetArgs() {
pbArg := pc.exprToPB(arg)
if pbArg == nil {
return nil
}
children = append(children, pbArg)
}
return &tipb.Expr{Tp: tp, Children: children}
}示例3: isDecomposable
// isDecomposable checks if an aggregate function is decomposable. An aggregation function $F$ is decomposable
// if there exist aggregation functions F_1 and F_2 such that F(S_1 union all S_2) = F_2(F_1(S_1),F_1(S_2)),
// where S_1 and S_2 are two sets of values. We call S_1 and S_2 partial groups.
// It's easy to see that max, min, first row is decomposable, no matter whether it's distinct, but sum(distinct) and
// count(distinct) is not.
// Currently we don't support avg and concat.
func (a *aggPushDownSolver) isDecomposable(fun expression.AggregationFunction) bool {
switch fun.GetName() {
case ast.AggFuncAvg, ast.AggFuncGroupConcat:
// TODO: Support avg push down.
return false
case ast.AggFuncMax, ast.AggFuncMin, ast.AggFuncFirstRow:
return true
case ast.AggFuncSum, ast.AggFuncCount:
return !fun.IsDistinct()
default:
return false
}
}示例4: needValue
func needValue(af expression.AggregationFunction) bool {
return af.GetName() == ast.AggFuncSum || af.GetName() == ast.AggFuncAvg || af.GetName() == ast.AggFuncFirstRow ||
af.GetName() == ast.AggFuncMax || af.GetName() == ast.AggFuncMin || af.GetName() == ast.AggFuncGroupConcat
}示例5: needCount
func needCount(af expression.AggregationFunction) bool {
return af.GetName() == ast.AggFuncCount || af.GetName() == ast.AggFuncAvg
}