Enum SourceColumnMatch 

#[non_exhaustive]
pub enum SourceColumnMatch {
    Unspecified,
    Position,
    Name,
    UnknownValue(UnknownValue),
}

Indicates the strategy used to match loaded columns to the schema.

Working with unknown values

This enum is defined as #[non_exhaustive] because Google Cloud may add additional enum variants at any time. Adding new variants is not considered a breaking change. Applications should write their code in anticipation of:

• New values appearing in future releases of the client library, and
• New values received dynamically, without application changes.

Please consult the Working with enums section in the user guide for some guidelines.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unspecified

Uses sensible defaults based on how the schema is provided. If autodetect is used, then columns are matched by name. Otherwise, columns are matched by position. This is done to keep the behavior backward-compatible.

Position

Matches by position. This assumes that the columns are ordered the same way as the schema.

Name

Matches by name. This reads the header row as column names and reorders columns to match the field names in the schema.

UnknownValue(UnknownValue)

If set, the enum was initialized with an unknown value.

Applications can examine the value using SourceColumnMatch::value or SourceColumnMatch::name.

Implementations

impl SourceColumnMatch

pub fn value(&self) -> Option<i32>

Gets the enum value.

Returns None if the enum contains an unknown value deserialized from the string representation of enums.

pub fn name(&self) -> Option<&str>

Gets the enum value as a string.

Returns None if the enum contains an unknown value deserialized from the integer representation of enums.

Trait Implementations

impl Clone for SourceColumnMatch

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SourceColumnMatch

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

Formats the value using the given formatter.

impl Default for SourceColumnMatch

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SourceColumnMatch

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for SourceColumnMatch

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

Formats the value using the given formatter.

impl From<&str> for SourceColumnMatch

fn from(value: &str) -> Self

Converts to this type from the input type.

impl From<i32> for SourceColumnMatch

fn from(value: i32) -> Self

Converts to this type from the input type.

impl PartialEq for SourceColumnMatch

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for SourceColumnMatch

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SourceColumnMatch