ClickHouseDialect

Struct ClickHouseDialect 

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pub struct ClickHouseDialect;
Expand description

A custom UnparserDialect for ClickHouse.

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impl Clone for ClickHouseDialect

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fn clone(&self) -> ClickHouseDialect

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ClickHouseDialect

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

Formats the value using the given formatter. Read more
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impl Default for ClickHouseDialect

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fn default() -> ClickHouseDialect

Returns the “default value” for a type. Read more
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impl Dialect for ClickHouseDialect

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fn identifier_quote_style(&self, _: &str) -> Option<char>

Return the character used to quote identifiers.
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fn scalar_function_to_sql_overrides( &self, unparser: &Unparser<'_>, func_name: &str, args: &[Expr], ) -> Result<Option<Expr>>

Allows the dialect to override scalar function unparsing if the dialect has specific rules. Returns None if the default unparsing should be used, or Some(ast::Expr) if there is a custom implementation for the function.
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fn supports_nulls_first_in_sort(&self) -> bool

Does the dialect support specifying NULLS FIRST/LAST in ORDER BY clauses?
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fn use_timestamp_for_date64(&self) -> bool

Does the dialect use TIMESTAMP to represent Date64 rather than DATETIME? E.g. Trino, Athena and Dremio does not have DATETIME data type
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fn interval_style(&self) -> IntervalStyle

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fn float64_ast_dtype(&self) -> DataType

Does the dialect use DOUBLE PRECISION to represent Float64 rather than DOUBLE? E.g. Postgres uses DOUBLE PRECISION instead of DOUBLE
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fn utf8_cast_dtype(&self) -> DataType

The SQL type to use for Arrow Utf8 unparsing Most dialects use VARCHAR, but some, like MySQL, require CHAR
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fn large_utf8_cast_dtype(&self) -> DataType

The SQL type to use for Arrow LargeUtf8 unparsing Most dialects use TEXT, but some, like MySQL, require CHAR
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fn date_field_extract_style(&self) -> DateFieldExtractStyle

The date field extract style to use: DateFieldExtractStyle
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fn character_length_style(&self) -> CharacterLengthStyle

The character length extraction style to use: CharacterLengthStyle
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fn int64_cast_dtype(&self) -> DataType

The SQL type to use for Arrow Int64 unparsing Most dialects use BigInt, but some, like MySQL, require SIGNED
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fn int32_cast_dtype(&self) -> DataType

The SQL type to use for Arrow Int32 unparsing Most dialects use Integer, but some, like MySQL, require SIGNED
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fn timestamp_cast_dtype( &self, _time_unit: &TimeUnit, tz: &Option<Arc<str>>, ) -> DataType

The SQL type to use for Timestamp unparsing Most dialects use Timestamp, but some, like MySQL, require Datetime Some dialects like Dremio does not support WithTimeZone and requires always Timestamp
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fn date32_cast_dtype(&self) -> DataType

The SQL type to use for Arrow Date32 unparsing Most dialects use Date, but some, like SQLite require TEXT
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fn supports_column_alias_in_table_alias(&self) -> bool

Does the dialect support specifying column aliases as part of alias table definition? (SELECT col1, col2 from my_table) AS my_table_alias(col1_alias, col2_alias)
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fn requires_derived_table_alias(&self) -> bool

Whether the dialect requires a table alias for any subquery in the FROM clause This affects behavior when deriving logical plans for Sort, Limit, etc.
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fn division_operator(&self) -> BinaryOperator

The division operator for the dialect Most dialect uses BinaryOperator::Divide (/) But DuckDB dialect uses BinaryOperator::DuckIntegerDivide (//)
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fn window_func_support_window_frame( &self, _func_name: &str, _start_bound: &WindowFrameBound, _end_bound: &WindowFrameBound, ) -> bool

Allows the dialect to choose to omit window frame in unparsing based on function name and window frame bound Returns false if specific function name / window frame bound indicates no window frame is needed in unparsing
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fn with_custom_scalar_overrides( self, _handlers: Vec<(&str, Box<dyn Fn(&Unparser<'_>, &[Expr]) -> Result<Option<Expr>, DataFusionError> + Send + Sync>)>, ) -> Self
where Self: Sized,

Extends the dialect’s default rules for unparsing scalar functions. This is useful for supporting application-specific UDFs or custom engine extensions.
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fn full_qualified_col(&self) -> bool

Allow to unparse a qualified column with a full qualified name (e.g. catalog_name.schema_name.table_name.column_name) Otherwise, the column will be unparsed with only the table name and column name (e.g. table_name.column_name)
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fn unnest_as_table_factor(&self) -> bool

Allow to unparse the unnest plan as ast::TableFactor::UNNEST. Read more
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fn col_alias_overrides( &self, _alias: &str, ) -> Result<Option<String>, DataFusionError>

Allows the dialect to override column alias unparsing if the dialect has specific rules. Returns None if the default unparsing should be used, or Some(String) if there is a custom implementation for the alias.
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impl Hash for ClickHouseDialect

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for ClickHouseDialect

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for ClickHouseDialect

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impl Eq for ClickHouseDialect

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impl StructuralPartialEq for ClickHouseDialect

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> DynEq for T
where T: Eq + Any,

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fn dyn_eq(&self, other: &(dyn Any + 'static)) -> bool

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impl<T> DynHash for T
where T: Hash + Any,

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fn dyn_hash(&self, state: &mut dyn Hasher)

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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,

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impl<T> ErasedDestructor for T
where T: 'static,