Struct FieldMask 

pub struct FieldMask(pub u16);

字段投影掩码：u16 位图，bit i=1 表示导出第 i 个字段（共 15 个）

Tuple Fields

0: u16

Implementations

impl FieldMask

pub const ALL: Self

全部 15 个字段都导出（默认值）

pub fn from_names(names: &[String]) -> Result<Self, String>

从字段名列表构建掩码，未知字段名返回错误消息

Errors

列表中包含未知字段名时返回含该字段名的错误消息。

pub fn includes_normalized_sql(self) -> bool

normalized_sql 字段（索引 14）是否启用

Trait Implementations

impl Clone for FieldMask

fn clone(&self) -> FieldMask

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FieldMask

impl Debug for FieldMask

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

Formats the value using the given formatter.

impl Default for FieldMask

fn default() -> Self

Returns the “default value” for a type.

impl Eq for FieldMask

impl PartialEq for FieldMask

fn eq(&self, other: &FieldMask) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for FieldMask