Restrict the max depth of plan tree in optimizer to avoid stack overflow

[yixinglu]

Introduction

sometimes there is a too long query for optimizer to handle. because the optimizer of nebula use recursive functions to find the best plan currently, this maybe cause the stack overflow crash.

It's better to restrict the max depth of execution plan and response error if the plan tree exceed the threshold value.

The long queries are often generated by some applications and that means the queries need some manual optimizations.

Contents

Related work