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To convert a column of type String into JSON format in AWS Athena, you can use the parse_json() function. Here's an example query:
SELECT parse_json(my_string_column) as my_json_column
FROM my_table
In this query, my_string_column is the name of the column you want to convert, and my_json_column is the name of the column you want to create with the JSON output.
The parse_json() function takes a string as input and returns a JSON object. You can then use the . operator to access specific fields in the JSON object:
SELECT parse_json(my_string_column).name as my_name
FROM my_table
In this query, name is a field in the JSON object returned by parse_json(). The resulting my_name column will contain the value of the name field.