Add support for generated columns skipping 'GENERATED ALWAYS' keywords #1058
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tobyhede
approved these changes
Nov 29, 2023
src/ast/ddl.rs
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| generation_expr: Option<Expr>, | ||
| generation_expr_mode: Option<GeneratedExpressionMode>, | ||
| /// false if 'GENERATED ALWAYS' is skipped (option starts with AS) | ||
| generated_kw: bool, |
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Personal preference, but I would be inclined to expand the name to generated_keyword for clarity.
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No problem, I've done that renaming.
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LGTM |
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alamb
approved these changes
Dec 19, 2023
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Looks good to me -- thank you @takluyver and thank you @tobyhede for the review
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Thanks! |
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SQLite, Mysql and DuckDB all let you skip the words
GENERATED ALWAYS, and useASto introduce a column generated from an expression. See the links in #1051 for details.I've introduced an extra field in
ColumnOption::Generated-generated_kwis true if theGENERATEDkeyword is present, and false if the SQL skips directly toAS. I'm not sure of the naming, but it's the best I've thought of so far. Currently, ifgeneration_expris None,generated_kwcan only be true (and is assumed to be when recreating the SQL).Perhaps a neater design would be to have different
ColumnOptionkinds for generated-from-expression vs. generated-from-sequence vs. whatever else. But that would require an API break again.Closes #1050.