Struct mz_sql::func::PolymorphicSolution
source · pub(crate) struct PolymorphicSolution {
compat: Option<PolymorphicCompatClass>,
seen: Vec<Option<ScalarType>>,
key: Option<ScalarType>,
}
Expand description
Represents a solution to a set of polymorphic constraints, expressed as the
params
of a function and the user-supplied args
.
Fields§
§compat: Option<PolymorphicCompatClass>
Constrains this solution to a particular form of polymorphic compatibility.
seen: Vec<Option<ScalarType>>
§key: Option<ScalarType>
An internal representation of the discovered polymorphic type.
Implementations§
source§impl PolymorphicSolution
impl PolymorphicSolution
sourcefn new(
ecx: &ExprContext<'_>,
args: &[Option<ScalarType>],
params: &ParamList
) -> Option<PolymorphicSolution>
fn new( ecx: &ExprContext<'_>, args: &[Option<ScalarType>], params: &ParamList ) -> Option<PolymorphicSolution>
Provides a solution to the polymorphic type constraints expressed in
params
based on the users’ input in args
. Returns None
if a
solution cannot be found.
After constructing the PolymorphicSolution
, access its solution using
PolymorphicSolution::target_for_param_type
.
sourcefn track_seen(&mut self, param: &ParamType, seen: Option<ScalarType>)
fn track_seen(&mut self, param: &ParamType, seen: Option<ScalarType>)
Determines the desired type of polymorphic compatibility, as well as the values to determine a polymorphic solution.
sourcefn determine_key(&mut self, ecx: &ExprContext<'_>) -> bool
fn determine_key(&mut self, ecx: &ExprContext<'_>) -> bool
Attempt to resolve all polymorphic types to a single “key” type. For
target_for_param_type
to be useful, this must have already been
called.
fn target_for_param_type(&self, param: &ParamType) -> Option<ScalarType>
Trait Implementations§
Auto Trait Implementations§
impl RefUnwindSafe for PolymorphicSolution
impl Send for PolymorphicSolution
impl Sync for PolymorphicSolution
impl Unpin for PolymorphicSolution
impl UnwindSafe for PolymorphicSolution
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