Enum AlterTableTarget 

pub enum AlterTableTarget {
    SetHotTierBytes(u64),
    AddForeignKey(ForeignKeyConstraint),
    DropForeignKey {
        name: String,
        if_exists: bool,
    },
    AddColumn {
        column: ColumnDef,
        if_not_exists: bool,
    },
    AlterColumnType {
        column: String,
        new_type: ColumnTypeName,
        using: Option<Expr>,
    },
}

Variants

SetHotTierBytes(u64)

Per-table hot-tier byte budget override. The freezer reads this before falling back to SPG_HOT_TIER_BYTES.

AddForeignKey(ForeignKeyConstraint)

v7.6.8 — ALTER TABLE t ADD CONSTRAINT name FOREIGN KEY (cols) REFERENCES parent[(pcols)] [ON DELETE/UPDATE …]. Engine validates existing rows against the new constraint before installing it.

DropForeignKey

v7.6.8 — ALTER TABLE t DROP CONSTRAINT [IF EXISTS] name. if_exists (v7.13.2 mailrs round-6 S7) makes the drop a no-op when no FK with that name exists; otherwise raises.

Fields

name: String

if_exists: bool

AddColumn

v7.13.0 — ALTER TABLE t ADD [COLUMN] [IF NOT EXISTS] <col> <type> [DEFAULT <expr>] [NOT NULL]. mailrs round-5 G1 (20 migrate-*.sql hits). Engine appends the column to the schema and back-fills every existing row with the DEFAULT (or NULL when no DEFAULT and the column is nullable).

Fields

column: ColumnDef

if_not_exists: bool

AlterColumnType

v7.13.0 — ALTER TABLE t ALTER COLUMN <col> TYPE <ty> [USING <expr>] (mailrs round-5 G8). Engine rewrites every existing row’s column value by evaluating the optional USING expression (default col::<ty>) and re-coercing against the new column type.

Fields

column: String

new_type: ColumnTypeName

using: Option<Expr>

Trait Implementations

impl Clone for AlterTableTarget

fn clone(&self) -> AlterTableTarget

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AlterTableTarget

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

Formats the value using the given formatter.

impl PartialEq for AlterTableTarget

fn eq(&self, other: &AlterTableTarget) -> 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 StructuralPartialEq for AlterTableTarget