Enum postgres_parser::sys::ParamKind

#[repr(u32)]pub enum ParamKind {
    PARAM_EXTERN,
    PARAM_EXEC,
    PARAM_SUBLINK,
    PARAM_MULTIEXPR,
}

Param

paramkind specifies the kind of parameter. The possible values for this field are:

PARAM_EXTERN: The parameter value is supplied from outside the plan. Such parameters are numbered from 1 to n.

PARAM_EXEC: The parameter is an internal executor parameter, used for passing values into and out of subqueries or from nestloop joins to their inner scans. For historical reasons, such parameters are numbered from 0. These numbers are independent of PARAM_EXTERN numbers.

PARAM_SUBLINK: The parameter represents an output column of a SubLink node's subselect. The column number is contained in the 'paramid' field. (This type of Param is converted to PARAM_EXEC during planning.)

PARAM_MULTIEXPR: Like PARAM_SUBLINK, the parameter represents an output column of a SubLink node's subselect, but here, the SubLink is always a MULTIEXPR SubLink. The highorder 16 bits of the 'paramid' field contain the SubLink's subLinkId, and the loworder 16 bits contain the column number. (This type of Param is also converted to PARAM_EXEC during planning.)

Variants

PARAM_EXTERN

PARAM_EXEC

PARAM_SUBLINK

PARAM_MULTIEXPR

Trait Implementations

impl Clone for ParamKind

fn clone(&self) -> ParamKind

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ParamKind

impl Debug for ParamKind

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ParamKind

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl Eq for ParamKind

impl Hash for ParamKind

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl PartialEq<ParamKind> for ParamKind

fn eq(&self, other: &ParamKind) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Serialize for ParamKind

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.

impl StructuralEq for ParamKind

impl StructuralPartialEq for ParamKind