Struct ColumnDef 

pub struct ColumnDef {

    pub name: String,
    pub ty: ColumnType,
    pub object_id: Option<[u8; 16]>,
    pub missing_value: Option<Value>,
    pub primary_key: bool,
    pub not_null: bool,
    pub not_null_explicit: bool,
    pub not_null_name: Option<String>,
    pub not_null_validated: bool,
    pub not_null_no_inherit: bool,
    pub not_null_is_local: bool,
    pub auto_increment: Option<AutoIncrement>,
    pub unique: bool,
    pub default: Option<Expr>,
    pub generated: Option<GeneratedColumn>,
    pub check: Option<Expr>,
    pub check_name: Option<String>,
    pub check_enforced: bool,
    pub check_validated: bool,
    pub check_no_inherit: bool,
    pub check_is_local: bool,
    pub check_object_id: Option<[u8; 16]>,
    pub references: Option<ForeignKeyRef>,
}

Fields

name: String

ty: ColumnType

object_id: Option<[u8; 16]>

Durable identity of this catalog column. Logical names can change while a fixed transaction snapshot continues to address the same column.

missing_value: Option<Value>

Value exposed for physical rows captured before this column was added. This is the catalog equivalent of PostgreSQL’s attmissingval.

primary_key: bool

not_null: bool

not_null_explicit: bool

Whether NOT NULL was declared as its own constraint instead of being implied by PRIMARY KEY or an auto-incrementing identity.

not_null_name: Option<String>

Durable PostgreSQL 18 NOT NULL constraint name. Parsing leaves an unnamed declaration as None; table registration assigns and persists PostgreSQL’s generated name before the constraint becomes visible.

not_null_validated: bool

Whether the named NOT NULL constraint has been validated against every pre-existing row. NOT VALID still enforces future writes.

not_null_no_inherit: bool

Durable NO INHERIT state for PostgreSQL 18 named NOT NULL constraints.

not_null_is_local: bool

Whether this relation declares its NOT NULL constraint locally, independently from inherited parent constraints. Older serialized definitions retain their original local catalog projection.

auto_increment: Option<AutoIncrement>

Sequence provenance for SERIAL / BIGSERIAL and identity columns. The custom decoder accepts the legacy boolean representation written by releases that merged both SQL features into one table counter.

unique: bool

UNIQUE column constraint – the engine rejects an INSERT whose value for this column already exists in another row.

default: Option<Expr>

DEFAULT <expr>. Evaluated at INSERT time when the column is not present in the row tuple. Persisted in catalog metadata so reopened engines keep the same INSERT semantics.

generated: Option<GeneratedColumn>

PostgreSQL 18 generated-column definition. Stored values are refreshed on every row write; virtual values are evaluated from the physical row only when a logical row is read.

check: Option<Expr>

CHECK (<expr>) column-level constraint. Evaluated at INSERT (and UPDATE-replace) time against the row being written.

check_name: Option<String>

check_enforced: bool

check_validated: bool

check_no_inherit: bool

check_is_local: bool

Whether this relation declares its column CHECK locally, independently from inherited copies. Missing legacy origin retains the historical local projection.

check_object_id: Option<[u8; 16]>

Durable identity of the column CHECK, preserved across constraint and relation renames.

references: Option<ForeignKeyRef>

Column-level REFERENCES parent[(col)] foreign key. An omitted column is resolved to the referenced primary key before publication.

Trait Implementations

impl Clone for ColumnDef

fn clone(&self) -> ColumnDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnDef

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ColumnDef

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ColumnDef

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

where __S: Serializer,

Serialize this value into the given Serde serializer.