Struct AddColumnRequest 

pub struct AddColumnRequest {
    pub name: String,
    pub iceberg_type: String,
    pub required: bool,
    pub initial_default: Option<Value>,
    pub write_default: Option<Value>,
    pub doc: Option<String>,
}

Request to add a new column to the table schema.

Iceberg types

Common type strings: "int", "long", "float", "double", "boolean", "string", "date", "timestamp", "timestamptz", "binary".

Complex types ("list<int>", "map<string,long>", "struct<…>") are stored verbatim; SchemaFiller maps them to Utf8 when injecting defaults.

Fields

name: String

iceberg_type: String

Iceberg type string — see struct-level doc for accepted values.

required: bool

false (nullable) is the safe default for additions so old files never error.

initial_default: Option<Value>

Value returned when reading records from files written before this column existed. None → readers inject null for those rows.

write_default: Option<Value>

Value written to new records when no explicit value is supplied. Defaults to initial_default when omitted.

doc: Option<String>

Human-readable field documentation stored in the schema JSON.