Struct vegafusion_sql::dialect::Dialect

pub struct Dialect {

    pub quote_style: char,
    pub binary_ops: HashSet<Operator>,
    pub binary_op_transforms: HashMap<Operator, Arc<dyn BinaryOperatorTransformer>>,
    pub scalar_functions: HashSet<String>,
    pub aggregate_functions: HashSet<String>,
    pub window_functions: HashSet<String>,
    pub scalar_transformers: HashMap<String, Arc<dyn FunctionTransformer>>,
    pub aggregate_transformers: HashMap<String, Arc<dyn FunctionTransformer>>,
    pub values_mode: ValuesMode,
    pub supports_null_ordering: bool,
    pub impute_fully_qualified: bool,
    pub joinaggregate_fully_qualified: bool,
    pub supports_bounded_window_frames: bool,
    pub supports_window_frame_groups: bool,
    pub supports_frames_in_navigation_window_functions: bool,
    pub supports_frames_in_numbering_window_functions: bool,
    pub cast_datatypes: HashMap<DataType, SqlDataType>,
    pub cast_transformers: HashMap<(DataType, DataType), Arc<dyn CastTransformer>>,
    pub cast_propagates_null: bool,
    pub supports_non_finite_floats: bool,
    /* private fields */
}

Fields

quote_style: char

The starting quote if any. Valid quote characters are the single quote, double quote, backtick, and opening square bracket.

binary_ops: HashSet<Operator>

Supported binary operators

binary_op_transforms: HashMap<Operator, Arc<dyn BinaryOperatorTransformer>>

Transforms for binary operators

scalar_functions: HashSet<String>

Names of supported scalar functions that match the semantics of the DataFusion implementation

aggregate_functions: HashSet<String>

Names of supported aggregate functions that match the semantics of the DataFusion implementation

window_functions: HashSet<String>

Names of supported window functions that match the semantics of the DataFusion implementation

scalar_transformers: HashMap<String, Arc<dyn FunctionTransformer>>

Scalar function transformations

aggregate_transformers: HashMap<String, Arc<dyn FunctionTransformer>>

Aggregate function transformations

values_mode: ValuesMode

Implementation mode for inline VALUES

supports_null_ordering: bool

Whether NULLS FIRST, NULLS LAST is supported in ORDER BY

impute_fully_qualified: bool

Whether to use fully qualified table.column expressions when referencing nested queries in impute queries

joinaggregate_fully_qualified: bool

Whether to use fully qualified table.column expressions when referencing nested queries in joinaggregate queries

supports_bounded_window_frames: bool

Whether dialect supports the use of bounded window frames

supports_window_frame_groups: bool

Whether dialect supports the GROUPS option to window frames

supports_frames_in_navigation_window_functions: bool

Whether dialect supports the use of explicit window frames for navigation window functions (first_value, last_value, nth_value)

supports_frames_in_numbering_window_functions: bool

Whether dialect supports the use of explicit window frames for numbering window functions (row_number, rank, etc)

cast_datatypes: HashMap<DataType, SqlDataType>

Mapping from Arrow DataTypes to SqlParser DataTypes for dialect

cast_transformers: HashMap<(DataType, DataType), Arc<dyn CastTransformer>>

Cast expression transformations between particular data types

cast_propagates_null: bool

Whether dialect supports null values in cast expressions

supports_non_finite_floats: bool

Whether dialect supports -inf, nan, and inf float values. If false, non-finite values are converted to NULL

Implementations

impl Dialect

pub fn parser_dialect(&self) -> Arc<dyn SqlParserDialect>

pub fn athena() -> Self

pub fn bigquery() -> Self

pub fn clickhouse() -> Self

pub fn databricks() -> Self

pub fn datafusion() -> Self

pub fn duckdb() -> Self

pub fn mysql() -> Self

pub fn postgres() -> Self

pub fn redshift() -> Self

pub fn snowflake() -> Self

Trait Implementations

impl Clone for Dialect

fn clone(&self) -> Dialect

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Dialect

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

Formats the value using the given formatter.

impl Default for Dialect

fn default() -> Self

Returns the “default value” for a type.

impl FromStr for Dialect

type Err = VegaFusionError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self>

Parses a string s to return a value of this type.