Expand description
TBD: Currently, sql::func handles matching arguments to their respective
built-in functions (for most built-in functions, at least).
Macros
Constructs builtin function map.
Functions using this macro should be transformed/planned away before reaching function selection code, but still need to be present in the catalog during planning.
Provides shorthand for converting Vec<ScalarType> into Vec<ParamType>.
Structs
Tracks candidate implementations.
Describes a single function’s implementation.
Describes how each implementation should be represented in the catalog.
Builds an expression that evaluates a scalar function on the provided input expressions.
Represents a solution to a set of polymorphic constraints, expressed as the
params of a function and the user-supplied args.
Enums
A specifier for a function or an operator.
Describes possible types of function parameters.
Describes parameter types.
Statics
Correlates an operator with all of its implementations.
Correlates a built-in function name to its implementations.
Traits
Functions
Finds an exact match based on the arguments, or, if no exact match, finds the best match available. Patterned after PostgreSQL’s type conversion matching algorithm.
Resolves the operator to a set of function implementations.
Selects the best implementation given the provided args using a
process similar to PostgreSQL’s parser, and returns the
ScalarExpr to invoke that function.
Backing implementation for sql_impl_func and sql_impl_cast. See those functions for details.