Minor: change internal error to not supported error for nested field … #11446
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…access
Which issue does this PR close?
Related to #11445
Rationale for this change
the reproducer on #11445 results in an "internal error" but really the issue is the feature is not implemented yet.
What changes are included in this PR?
Change error to "not implemented yet"
Are these changes tested?
CI
Are there any user-facing changes?
Hopefully less "internal error" messages