[SPARK-49995][SQL] Add named argument support to more TVFs

[ueshin]

What changes were proposed in this pull request?

Add named argument support to more TVFs.

SELECT * FROM inline(input => array(struct(1, 'a'), struct(2, 'b')));
SELECT * FROM inline_outer(input => array(struct(1, 'a'), struct(2, 'b')));

SELECT * FROM posexplode(collection => array(1, 2));
SELECT * FROM posexplode_outer(collection => map('a', 1, 'b', 2));

SELECT * FROM variant_explode(input => parse_json('["hello", "world"]'));
SELECT * FROM variant_explode_outer(input => parse_json('{"a": true, "b": 3.14}'));

Why are the changes needed?

The following TVFs should support named argument as same as explode:

• inline
• posexplode
• variant_explode

and their _outer variations.

Does this PR introduce any user-facing change?

Yes, the above functions support named arguments.

How was this patch tested?

Added the related tests.

Was this patch authored or co-authored using generative AI tooling?

No.

[ueshin]

cc @dtenedor @chenhao-db @srielau

[allisonwang-db]

Looks great!

[allisonwang-db]

Hmm I don't think we can use them as table functions since 2.0. SELECT * FROM inline(...) is added recently (in spark 3.4 or 3.5)

[ueshin]

That's a good point. Now that we have separate definitions, we can maybe mention each of them in each definition.
Also the named arguments should be supported later than the tvfs were added, I guess? Do we have a way to mention about the updates?

[allisonwang-db]

I guess this should be fine. Users will only see the updated usage for the function in the latest version.

[allisonwang-db]

cc @gene-db