Struct ShardConfig 

pub struct ShardConfig {
    pub key: String,
}

Primary-key range sharding settings for the MSSQL source.

The source is split by contiguous ranges of an integer-typed column: each shard runs SELECT * FROM (<query>) WHERE [key] >= lo AND [key] < hi. The column must be present in the query’s output and orderable as a 64-bit integer (e.g. a BIGINT/INT IDENTITY primary key).

ORDER BY: T-SQL forbids ORDER BY inside a derived table (without TOP/OFFSET), so a sharded query must not end in a top-level ORDER BY — ordering across concurrently-executing shards is meaningless anyway.

Nullable keys: if the key column contains NULLs, those rows are not visible to the MIN/MAX range enumeration. They are still read — exactly one shard (the last) additionally matches [key] IS NULL, so NULL-key rows are covered by precisely one shard with no loss and no duplication.

Fields

key: String

Integer column to range-partition on. Quoted as an identifier (brackets) before use, so it is safe against injection but must name a real output column.

Trait Implementations

impl Clone for ShardConfig

fn clone(&self) -> ShardConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ShardConfig

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ShardConfig

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ShardConfig

impl JsonSchema for ShardConfig

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for ShardConfig

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for ShardConfig

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 ShardConfig