I had a csv file in that there is a tag column for that column there is a nested json data, now I have to flatten those data and ingest it into druid data source.
Basically tags data are got like string data like- "key1":"value1","key2":"value2","key3":"value3" I have added the {} using concat function in druid. Now after doing this I have to do flatten. I want to do flatten this converted json data.
I want sub string data as a column.