Enum ScalarFunctionForm 

#[non_exhaustive]
pub enum ScalarFunctionForm {
    PostgreSql,
    DuckDb,
    TSql,
    ClickHouse,
    Snowflake,
    MySql,
    Databricks,
    GoogleSql,
    Redshift,
}

Which scalar-function grammar this engine speaks.

The default is ScalarFunctionForm::PostgreSql, which is what an unlisted dialect has always been handed. It is a guess and a dangerous one on a near neighbour: LANGUAGE SQL IMMUTABLE PARALLEL SAFE is a “syntax error at or near PARALLEL” on Redshift, an engine that descends from PostgreSQL and reports itself as one. State your form.

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.

PostgreSql

CREATE FUNCTION … RETURNS … LANGUAGE SQL IMMUTABLE PARALLEL SAFE AS $$…$$ — PostgreSQL, Citus and Razeri’s agnostic renderer.

DuckDb

DuckDB’s CREATE MACRO.

TSql

T-SQL’s scalar UDF.

ClickHouse

ClickHouse’s lambda CREATE FUNCTION … AS (x) -> ….

Snowflake

Snowflake’s UDF.

MySql

MySQL/MariaDB’s CREATE FUNCTION … DETERMINISTIC.

Databricks

Databricks SQL’s UDF.

GoogleSql

GoogleSQL’s CREATE FUNCTION — BigQuery’s.

Redshift

Redshift’s: the volatility is mandatory rather than optional, there is no PARALLEL SAFE, LANGUAGE follows the body rather than preceding it, and the body addresses its parameters as $1 and never by name.

Trait Implementations

impl Clone for ScalarFunctionForm

fn clone(&self) -> ScalarFunctionForm

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ScalarFunctionForm

impl Debug for ScalarFunctionForm

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

Formats the value using the given formatter.

impl Default for ScalarFunctionForm

fn default() -> ScalarFunctionForm

Returns the “default value” for a type.

impl Eq for ScalarFunctionForm

impl PartialEq for ScalarFunctionForm

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScalarFunctionForm