Module sql::plan::typeconv [−][src]
Expand description
Maintains a catalog of valid casts between repr::ScalarType
s, as well as
other cast-related functions.
Macros
Structs
The implementation of a cast.
A cast template is a function that produces a Cast
given a concrete input
and output type. A template can return None
to indicate that it is
incapable of producing a cast for the specified types.
Enums
Describes the context of a cast.
Functions
Reports whether it is possible to perform a cast from the specified types.
Get casts directly between two ScalarType
s, with control over the
allowed CastContext
.
Guesses the most-common type among a set of ScalarType
s that all members
can be cast to. Returns None
if a common type cannot be deduced.
Plans a cast between ScalarType
s, specifying which types of casts are
permitted using CastContext
.
Similar to plan_cast
, but for situations where you only know the type of
the input expression (from
) and not the expression itself. The returned
expression refers to the first column of some imaginary row, where the first
column is assumed to have type from
.
Like func::sql_impl_func, but for casts.
Converts an expression to ScalarType::Jsonb
.
Converts an expression to ScalarType::String
.
Type Definitions
A cast is a function that takes a ScalarExpr
to another ScalarExpr
.