Enum mz_sql::plan::expr::CoercibleScalarExpr

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pub enum CoercibleScalarExpr {
    Coerced(HirScalarExpr),
    Parameter(usize),
    LiteralNull,
    LiteralString(String),
    LiteralRecord(Vec<CoercibleScalarExpr>),
}
Expand description

A CoercibleScalarExpr is a HirScalarExpr whose type is not fully determined. Several SQL expressions can be freely coerced based upon where in the expression tree they appear. For example, the string literal ‘42’ will be automatically coerced to the integer 42 if used in a numeric context:

SELECT '42' + 42

This separate type gives the code that needs to interact with coercions very fine-grained control over what coercions happen and when.

The primary driver of coercion is function and operator selection, as choosing the correct function or operator implementation depends on the type of the provided arguments. Coercion also occurs at the very root of the scalar expression tree. For example in

SELECT ... WHERE $1

the WHERE clause will coerce the contained unconstrained type parameter $1 to have type bool.

Variants§

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Coerced(HirScalarExpr)

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Parameter(usize)

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LiteralNull

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LiteralString(String)

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LiteralRecord(Vec<CoercibleScalarExpr>)

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Trait Implementations§

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impl AbstractExpr for CoercibleScalarExpr

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type Type = CoercibleColumnType

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fn typ( &self, outers: &[RelationType], inner: &RelationType, params: &BTreeMap<usize, ScalarType>, ) -> Self::Type

Computes the type of the expression.
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impl Clone for CoercibleScalarExpr

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fn clone(&self) -> CoercibleScalarExpr

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CoercibleScalarExpr

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl From<HirScalarExpr> for CoercibleScalarExpr

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fn from(expr: HirScalarExpr) -> CoercibleScalarExpr

Converts to this type from the input type.

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