Struct ColumnDesc

pub struct ColumnDesc {
    pub data_type: DataType,
    pub column_id: ColumnId,
    pub name: String,
    pub field_descs: Vec<ColumnDesc>,
    pub type_name: String,
    pub generated_or_default_column: Option<GeneratedOrDefaultColumn>,
    pub description: Option<String>,
    pub additional_column: AdditionalColumn,
    pub version: ColumnDescVersion,
    pub system_column: Option<SystemColumn>,
}

Fields

data_type: DataType

column_id: ColumnId

name: String

field_descs: Vec<ColumnDesc>

type_name: String

generated_or_default_column: Option<GeneratedOrDefaultColumn>

description: Option<String>

additional_column: AdditionalColumn

version: ColumnDescVersion

system_column: Option<SystemColumn>

Currently the system column is used for _rw_timestamp only and is generated at runtime, so this field is not persisted.

Implementations

impl ColumnDesc

pub fn unnamed(column_id: ColumnId, data_type: DataType) -> ColumnDesc

pub fn named( name: impl Into<String>, column_id: ColumnId, data_type: DataType, ) -> ColumnDesc

pub fn named_with_default_value( name: impl Into<String>, column_id: ColumnId, data_type: DataType, snapshot_value: Option<ScalarImpl>, ) -> ColumnDesc

pub fn named_with_additional_column( name: impl Into<String>, column_id: ColumnId, data_type: DataType, additional_column_type: AdditionalColumn, ) -> ColumnDesc

pub fn named_with_system_column( name: impl Into<String>, column_id: ColumnId, data_type: DataType, system_column: SystemColumn, ) -> ColumnDesc

pub fn to_protobuf(&self) -> ColumnDesc

Convert to proto

pub fn flatten(&self) -> Vec<ColumnDesc>

Flatten a nested column to a list of columns (including itself). If the type is atomic, it returns simply itself. If the type has multiple nesting levels, it traverses for the tree-like schema, and returns every tree node.

pub fn new_atomic(data_type: DataType, name: &str, column_id: i32) -> ColumnDesc

pub fn new_struct( name: &str, column_id: i32, type_name: &str, fields: Vec<ColumnDesc>, ) -> ColumnDesc

pub fn from_field_with_column_id(field: &Field, id: i32) -> ColumnDesc

pub fn from_field_without_column_id(field: &Field) -> ColumnDesc

pub fn is_generated(&self) -> bool

pub fn is_default(&self) -> bool

Trait Implementations

impl Clone for ColumnDesc

fn clone(&self) -> ColumnDesc

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnDesc

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

Formats the value using the given formatter.

impl From<&ColumnDesc> for ColumnDesc

fn from(prost: &ColumnDesc) -> ColumnDesc

Converts to this type from the input type.

impl From<&ColumnDesc> for Field

fn from(desc: &ColumnDesc) -> Field

Converts to this type from the input type.

impl From<&SourceColumnDesc> for ColumnDesc

fn from(_: &SourceColumnDesc) -> ColumnDesc

Converts to this type from the input type.

impl From<ColumnDesc> for ColumnDesc

fn from(prost: ColumnDesc) -> ColumnDesc

Converts to this type from the input type.

impl From<ColumnDesc> for Field

fn from(column_desc: ColumnDesc) -> Field

Converts to this type from the input type.

impl Hash for ColumnDesc

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ColumnDesc

fn eq(&self, other: &ColumnDesc) -> 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 Eq for ColumnDesc

impl StructuralPartialEq for ColumnDesc