mongodb集合为时间序列集合（time series collection） 时，reader时，collStats获取集合的count时，报空指针
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- Java
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Description
Datax版本：https://datax-opensource.oss-cn-hangzhou.aliyuncs.com/202210/datax.tar.gz
Mongodb版本：5.0,6.0都有此问题
普通集合db.runCommand( { collStats : "xxx" } )是有count的:
但如果是时间序列的集合，是无count的：
所以针对时间序列集合，MongoDBReader会有问题，报空指针：
Contributor guide
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Research direction
Start with the MongoDBReader path that calls collStats to obtain a collection count, and reproduce the behavior against MongoDB 5.0 or 6.0 using a time-series collection. Done means the reader no longer throws a null-pointer error when collStats omits count, while ordinary collections continue to work.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java, mongodb
- Domain
- databases
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100