Convert JSON to Athena data types - Amazon Athena
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Convert JSON to Athena data types

To convert JSON data to Athena data types, use CAST.

Note

In this example, to denote strings as JSON-encoded, start with the JSON keyword and use single quotes, such as JSON '12345' 

WITH dataset AS (
  SELECT
    CAST(JSON '"HELLO ATHENA"' AS VARCHAR) AS hello_msg,
    CAST(JSON '12345' AS INTEGER) AS some_int,
    CAST(JSON '{"a":1,"b":2}' AS MAP(VARCHAR, INTEGER)) AS some_map
)
SELECT * FROM dataset

This query returns:


+-------------------------------------+
| hello_msg    | some_int | some_map  |
+-------------------------------------+
| HELLO ATHENA | 12345    | {a:1,b:2} |
+-------------------------------------+