Trait ScalarTypeSchema

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pub trait ScalarTypeSchema {
Show 17 methods    // Required methods
    fn has_unqualified_column(&self, name: &str) -> bool;
    fn column_is_ambiguous(&self, name: &str) -> bool;
    fn type_of(&self, name: &str) -> Option<&ColumnType>;
    fn column_type(&self, position: usize) -> Option<&ColumnType>;
    fn internal_type(&self, column: InternalColumnRef) -> Option<&ColumnType>;
    fn has_qualifier(&self, qualifier: &str) -> bool;
    fn has_qualified_column(&self, qualifier: &str, name: &str) -> bool;
    fn qualified_column_is_ambiguous(&self, qualifier: &str, name: &str) -> bool;
    fn qualified_type(&self, qualifier: &str, name: &str) -> Option<&ColumnType>;
    fn columns_are_open(&self, qualifier: Option<&str>) -> bool;
    fn physical_schema(&self) -> Option<&RowSchema>;

    // Provided methods
    fn observed_expression_type(
        &self,
        _: &ScalarExpr,
    ) -> Option<Option<&ColumnType>> { ... }
    fn whole_row_type(&self, _qualifier: &str) -> Option<&ColumnType> { ... }
    fn column_collation(&self, position: usize) -> Option<u32> { ... }
    fn collation_of(&self, name: &str) -> Option<u32> { ... }
    fn qualified_collation(&self, qualifier: &str, name: &str) -> Option<u32> { ... }
    fn internal_collation(&self, column: InternalColumnRef) -> Option<u32> { ... }
}

Expand description

Borrowed schema operations used by scalar type propagation and binding. Physical schemas retain their complete alias, ambiguity, open-column and executor-attribute behavior; declared column slices supply an unqualified positional namespace without allocating another schema generation.

Required Methods§

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fn physical_schema(&self) -> Option<&RowSchema>

Preserve the physical outer-row interface used by existing custom scalar-subquery resolvers. Declared column views have no query arena or physical outer row.

Provided Methods§

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fn observed_expression_type( &self, _: &ScalarExpr, ) -> Option<Option<&ColumnType>>

Reuse an already analyzed expression occurrence in this scope. Some(None) preserves an observed unknown type; None asks the caller to infer the expression normally. Borrowed observations must not outlive their original expressions or parameter environment.

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