Spec: Add support for default expression values#16777
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anoopj
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Jun 13, 2026
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| The `initial-default` must always be a constant (a single value); it is not allowed to be a function application. A literal is itself a value expression, so existing `write-default` values remain valid value expressions. In format version 3, both `initial-default` and `write-default` must be constants. | ||
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| All columns of `unknown`, `variant`, `geometry`, and `geography` types must default to null. Non-null `initial-default` or `write-default` values, including value expressions, are invalid. |
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What is the rationale? Is it to contain scope or is there some other reason?
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| Struct evolution requires the following rules for default values: | ||
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| * The `initial-default` must be set when a field is added and cannot change |
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Why did we remove this? Is this captured somewhere else?
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This PR adds support for value expressions in default values.
See proposal here