Enum CastChange 

pub enum CastChange {
    Create(Cast),
    Replace {
        from: Cast,
        to: Cast,
    },
    Drop {
        source: QualifiedName,
        target: QualifiedName,
    },
    CommentOn {
        source: QualifiedName,
        target: QualifiedName,
        comment: Option<String>,
    },
}

A change to a single cast (identity = (source, target)).

Casts are global (non-schema-scoped) objects with no owner. Any structural difference requires DROP CAST + CREATE CAST because Postgres has no ALTER CAST for method or context changes.

Variants

Create(Cast)

CREATE CAST (source AS target) …

Replace

DROP CAST (source AS target); CREATE CAST (source AS target) …; — any structural change has no in-place ALTER.

Fields

from: Cast

As it exists in the target (live).

to: Cast

As it should exist in the source.

Drop

DROP CAST (source AS target);

Fields

source: QualifiedName

Source type (part of identity).

target: QualifiedName

Target type (part of identity).

CommentOn

COMMENT ON CAST (source AS target) IS …;

Fields

source: QualifiedName

Source type (part of identity).

target: QualifiedName

Target type (part of identity).

comment: Option<String>

New comment (None clears it).

Trait Implementations

impl Clone for CastChange

fn clone(&self) -> CastChange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CastChange

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for CastChange

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for CastChange

impl PartialEq for CastChange

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for CastChange

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for CastChange