Function sql::plan::query::coerce_homogeneous_exprs

pub fn coerce_homogeneous_exprs(
    name: &str, 
    ecx: &ExprContext<'_>, 
    exprs: Vec<CoercibleScalarExpr>, 
    type_hint: Option<&ScalarType>
) -> Result<Vec<HirScalarExpr>, PlanError>

Coerces a list of expressions such that all input expressions will be cast to the same type. If successful, returns a new list of expressions in the same order as the input, where each expression has the appropriate casts to make them all of a uniform type.

Note that this is our implementation of Postgres’ type conversion for “UNION, CASE, and Related Constructs”, though it isn’t yet used in all of those cases.