Struct EngineValueCatalog 

pub struct EngineValueCatalog<'a>(pub &'a dyn EngineHook);

Adapt a scalar context without requiring embedders that only provide domain or composite metadata to implement enum support.

Tuple Fields

0: &'a dyn EngineHook

Trait Implementations

impl SQLValueCatalog for EngineValueCatalog<'_>

fn value_type_by_oid(&self, oid: u32) -> Result<Option<ColumnType>>

The declared type for a physical OID, including domains, arrays and composites.

fn value_composite_type( &self, oid: u32, ) -> Result<Option<Arc<CompositeTypeDescriptor>>>

The current descriptor of an admitted composite value.

fn enum_type_comparison_states(&self) -> Option<&EnumTypeComparisonStates>

The session’s comparison support functions, shared by declared type across nested array and record calls. Pure catalog readers do not own runtime state.

fn enum_type_labels(&self, oid: u32) -> Result<Option<Arc<EnumTypeLabels>>>

The labels of one enum type in the statement’s catalog generation, or None when the catalog has no such type.

fn enum_value_by_oid(&self, oid: u32) -> Result<Option<EnumValue>>

Resolve an already admitted physical label OID across enum types. Output uses the label’s actual identity even if a retained tuple now declares another enum type; it does not repeat input safety checks.

fn enum_label_position(&self, oid: u32) -> Result<Option<(u32, usize)>>

The actual enum type and zero-based label position of an admitted physical OID in this generation. Positions have declaration/key order and avoid copying label keys for comparison.

fn enum_label_uncommitted(&self, oid: u32) -> bool

Whether the current transaction added this label to a type that it did not create. PostgreSQL rejects such a label until the transaction commits.

fn enum_type_name(&self, oid: u32) -> Result<Option<String>>

format_type_be of the type, which qualifies a type hidden by the search path.

fn has_enum_types(&self) -> bool

Whether the statement catalog defines any enum type; binding skips enum literal validation otherwise.