Enum Transformation 

pub enum Transformation {
    NoOp,
    Replace(String),
    AddIndexHint {
        table: String,
        index: String,
    },
    ExpandSelectStar {
        columns: Vec<String>,
    },
    AddLimit(u32),
    AddWhereClause(String),
    AppendWhereAnd(String),
    ReplaceTable {
        from: String,
        to: String,
    },
    AddOrderBy {
        column: String,
        descending: bool,
    },
    AddHint(String),
    AddBranchHint(String),
    AddTimeout(Duration),
    Custom(String),
    Chain(Vec<Transformation>),
}

Query transformation

Variants

NoOp

No operation (pass through)

Replace(String)

Replace entire query

AddIndexHint

Add index hint

Fields

table: String

index: String

ExpandSelectStar

Rewrite SELECT * to specific columns

Fields

columns: Vec<String>

AddLimit(u32)

Add LIMIT clause

AddWhereClause(String)

Add WHERE condition

AppendWhereAnd(String)

Append to WHERE clause with AND

ReplaceTable

Replace table name

Fields

from: String

to: String

AddOrderBy

Add ORDER BY clause

Fields

column: String

descending: bool

AddHint(String)

Add query hint comment

AddBranchHint(String)

Add branch routing hint

AddTimeout(Duration)

Add timeout hint

Custom(String)

Custom transformation by name

Chain(Vec<Transformation>)

Chain multiple transformations

Implementations

impl Transformation

pub fn replace(query: impl Into<String>) -> Self

Create a replace transformation

pub fn add_limit(limit: u32) -> Self

Create an add-limit transformation

pub fn add_where(condition: impl Into<String>) -> Self

Create an add-where transformation

pub fn replace_table(from: impl Into<String>, to: impl Into<String>) -> Self

Create a replace-table transformation

pub fn expand_select_star(columns: Vec<impl Into<String>>) -> Self

Create an expand-select-star transformation

pub fn add_index_hint( table: impl Into<String>, index: impl Into<String>, ) -> Self

Create an add-index-hint transformation

pub fn chain(transformations: Vec<Transformation>) -> Self

Create a chain transformation

Trait Implementations

impl Clone for Transformation

fn clone(&self) -> Transformation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Transformation

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

Formats the value using the given formatter.