objchange: fix ProposedNew from null objects #29701
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The codepath for AllAttributesNull was not correct for any nested object types with collections, and should create single null values for the correct NestingMode rather than a single object with null attributes. Since there is no reason to descend into nested object types to create nullv alues, we can drop the AllAttributesNull function altogether and create null values as needed during ProposedNew. The corresponding AllBlockAttributesNull was only called internally in 1 location, and simply delegated to schema.EmptyValue. We can reduce the package surface area by dropping that function too and calling EmptyValue directly.
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alisdair
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Ah, data sources plan using an unknown prior value, which is not tested at all in the objchange package. I'll add another test for that too. |
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I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions. |
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The codepath for
AllAttributesNullwas not correct for any nested objecttypes with collections, and should create single null values for the
correct NestingMode rather than a single object with null attributes.
Since there is no reason to descend into nested object types to create
null values, we can drop the
AllAttributesNullfunction altogether andcreate null values as needed during
ProposedNew.The corresponding
AllBlockAttributesNullwas only called internally in 1location, and simply delegated to
schema.EmptyValue. We can reduce thepackage surface area by dropping that function too and calling
EmptyValuedirectly.Fixes #29697