NiFi decimal number format - apache-nifi

Question

Given the CSV input file below:
name,amount
Abc,"1,234.56"
Def,"2,222,222.222222"
The amount field contains decimal number with comma. How to parse it into a number in NiFi? I don't want to parse it into a string.
I thought of using the UpdateRecord processor, Expression Language, and Java's NumberFormat to parse it, but it seems that NumberFormat is inaccessible from Expression Language. Alternatively, I want to use ScriptedRecordSetWriter to parse, but couldn't find any working example out there.
Appreciate any help especially with a working example.

Answer 1

When we are reading the incoming data we still needs to use String type(as the data is enclosed in ") while writing out the data from UpdateRecord processor we can use int/decimal types to write the output flowfile records.
1. Using Record Path Value:
You can read the incoming data as String datatype, Output flowfile will have integer type defined() and using UpdateRecord processor replace the ',' with ''
Add new property in UpdateRecord processor as
/amount
substringBefore(replace(/amount,',',''),'.')
Now the output flowfile will have integer datatype for the amount field.
2. Using Literal Value:
If we are using literal value we can use NiFi expression language functions on field.value by using replace and toNumber functions we are able to get int value for amount field.
Both ways we are going to get output flowfile in json format as
[{"name":"Abc","amount":1234},{"name":"Def","amount":2222222}]
In the same way if you want to have decimal as output flowfile type define avro schema with decimal type and don't use substringBefore and toNumber functions.