Description
Need to add new function - schema_of_json(). The function should infer schema of JSON string literal. The result of the function is a schema in DDL format.
One of the use cases is passing output of schema_of_json() to from_json(). Currently, the from_json() function requires a schema as a mandatory argument. An user has to pass a schema as string literal in SQL. The new function should allow schema inferring from an example. Let's say json_col is a column containing JSON string with the same schema. It should be possible to pass a JSON string with the same schema to schema_of_json() which infers schema for the particular example.
select from_json(json_col, schema_of_json('{"f1": 0, "f2": [0], "f2": "a"}')) from json_table;
Attachments
Issue Links
- relates to
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SPARK-24642 Add a function which infers schema from a JSON column
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- Resolved
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- links to
