# Why has the format of object value in my Stripe Sigma query result changed?

As of September 3rd 2020, Stripe Sigma supports queries using Prestosql v334 SQL syntax. As a part of this change, object values, such as `map` and `array,` are now encoded in JSON format.
For example:
```
SELECT id, map_agg(key, value) AS dictionary FROM charges_metadata GROUP BY id
```
Old behavior:
```
id, dictionary
ch_123,{a=123, b=hello world}
...
```
New behavior:
```
id, dictionary
ch_123,"{""a"":""123"",""b"":""hello world""}"
```