bojana-db opened a new pull request, #56703:
URL: https://github.com/apache/spark/pull/56703
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### What changes were proposed in this pull request?
Adds the SQL function `variant_insert(v, path, val)`, which inserts a value
into a Variant value at a single JSONPath location.
Details:
- Object path (e.g. `$.b`): adds a new field; errors with
`VARIANT_DUPLICATE_KEY`
if the key already exists;
- Array path (e.g. `$[N]`): inserts at index `N`, shifting later elements
right; an
index past the end pads the gap with variant nulls;
- Missing intermediate keys/indices along the path are created;
- Any NULL argument returns NULL;
- The value may be any expression castable to variant;
- A new error condition `VARIANT_PATH_TYPE_MISMATCH` is raised when a path
segment
is applied to an incompatible value (e.g. an object key on an array); the
root
path `$` is rejected with `INVALID_VARIANT_PATH`, and results exceeding
the size
limit raise `VARIANT_SIZE_LIMIT`.
### Why are the changes needed?
There is no way to add a field or element to a variant; today the only
option is to convert it to another datatype (e.g. map), mutate, and convert
back.
### Does this PR introduce _any_ user-facing change?
Yes, a new SQL function (and Scala/Python `functions` API) plus a new error
condition `VARIANT_PATH_TYPE_MISMATCH`.
### How was this patch tested?
Unit tests.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code with Claude Opus 4.8
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