SELECT id,
avroCol.AvroProjectToJSON('{"type":"record","name":"rec_0","fields":[{"name":"First","type":"string"},{"name":"Age","type":"int"}]}')
FROM avroTable ORDER BY id;
Result:
id avroCol.AvroProjectToJSON(…)
-- -----------------------------
1 {"First":"Leo","Age":187}
2 {"First":"Mark","Age":180}
3 {"First":"William","Age":451}
4 {"First":"Charles","Age":203}