eric-maynard opened a new pull request, #39519:
URL: https://github.com/apache/spark/pull/39519
### What changes were proposed in this pull request?
Presently, only foldable expressions can be passed in to schema_of_json,
e.g. `SCHEMA_OF_JSON(CONCAT('', ''))`.
With this change, we accept _any_ string expression and infer the JSON
schema if possible.
### Why are the changes needed?
Users may have a column containing JSON strings, but today they can't find
the schema of each record. With this change, finding the schema of a given
column is possible.
### Does this PR introduce _any_ user-facing change?
Yes, schema_of_json will now accept string expressions which are not
foldable.
### How was this patch tested?
New tests were added in `JsonFunctionsSuite`
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