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November 22, 2019 07:35
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1.在tidb/planner/core/planbuilder.go 文件 | |
func (b *PlanBuilder) Build(ctx context.Context, node ast.Node) (Plan, error) 函数中加入日志 | |
case *ast.SelectStmt: | |
p,err:= b.buildSelect(ctx, x) | |
var sb2 strings.Builder | |
node.Restore(format.NewRestoreCtx(format.DefaultRestoreFlags, &sb2)) | |
logutil.Logger(context.Background()).Info("restore", zap.String("stmt",sb2.String())) | |
return p,err | |
2.编译运行tidb,连接数据库,执行 | |
use test; | |
create table t(a int); | |
SELECT ROW_NUMBER() OVER `w` FROM `test`.`t` WINDOW `w` AS (ORDER BY `a`); | |
3.观察tidb的日志,如果输出的restore和原始select一样,则通过 | |
复现的是 SELECT ROW_NUMBER() OVER `w` AS (ORDER BY `a`) FROM `test`.`t` WINDOW `w` AS (ORDER BY `a`) | |
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