AWS Glue Costum Classifiers and Partition creation

Question

My files are csv files with 3 fields using tab separation. 
The builtin classifier CSV creates a schema of 3 strings for the 3 attributes

a:string
b:string
c:string

however my last attribute **c** is a json string.

I would like to know if it's possible using a costum classifier to create an extra attribute **endpoint** that results from som pattern matching grok or regex.

Let's say , if the json string **c** looks like below .

```
{"log":{"timestampReceived":"2023-03-10 01:43:24,563 +0000","component":"ABC","subp":"0","eventStream":"DEF","endpoint":"sales"}}
```

I would like to grab the endpoint:sales into a new attribute of my table and use it as a partition.

it would end up like something below

a:string
b:string
c:string 
**endpoint**:string (partitioned)

Answer

Custom classifiers cannot be used to create partitioned table if the data itself is not partitioned.

Crawler creates a partitioned table based on directory structure and schema similarity at each level. Suppose there are 2 sub-directories in a target path and data in these directories are at least 70% similar, then it creates a partitioned table, otherwise it creates two table one for each sub-directory.

AWS Glue Costum Classifiers and Partition creation

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