fix(testcases/parser): implement VisitUserDefined so null::u!<type> parses#238

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SAY-5 wants to merge 2 commits intosubstrait-io:mainfrom

SAY-5:fix/testcases-parser-user-defined-null-237

Commits on Apr 23, 2026

fix(testcases/parser): implement VisitUserDefined so null::u!<type> parses
SAY-5
committed

Commits on Apr 29, 2026

test(testcases/parser): cover null::u!<type>[?] parsing path (#237)
SAY-5
committed