pub struct SchemaElement {
    pub type_: Option<Type>,
    pub type_length: Option<i32>,
    pub repetition_type: Option<FieldRepetitionType>,
    pub name: String,
    pub num_children: Option<i32>,
    pub converted_type: Option<ConvertedType>,
    pub scale: Option<i32>,
    pub precision: Option<i32>,
    pub field_id: Option<i32>,
    pub logical_type: Option<LogicalType>,
}
Expand description

Represents a element inside a schema definition.

  • if it is a group (inner node) then type is undefined and num_children is defined
  • if it is a primitive type (leaf) then type is defined and num_children is undefined the nodes are listed in depth first traversal order.

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§type_: Option<Type>

Data type for this field. Not set if the current element is a non-leaf node

§type_length: Option<i32>

If type is FIXED_LEN_BYTE_ARRAY, this is the byte length of the vales. Otherwise, if specified, this is the maximum bit length to store any of the values. (e.g. a low cardinality INT col could have this set to 3). Note that this is in the schema, and therefore fixed for the entire file.

§repetition_type: Option<FieldRepetitionType>

repetition of the field. The root of the schema does not have a repetition_type. All other nodes must have one

§name: String

Name of the field in the schema

§num_children: Option<i32>

Nested fields. Since thrift does not support nested fields, the nesting is flattened to a single list by a depth-first traversal. The children count is used to construct the nested relationship. This field is not set when the element is a primitive type

§converted_type: Option<ConvertedType>

DEPRECATED: When the schema is the result of a conversion from another model. Used to record the original type to help with cross conversion.

This is superseded by logicalType.

§scale: Option<i32>

DEPRECATED: Used when this column contains decimal data. See the DECIMAL converted type for more details.

This is superseded by using the DecimalType annotation in logicalType.

§precision: Option<i32>§field_id: Option<i32>

When the original schema supports field ids, this will save the original field id in the parquet schema

§logical_type: Option<LogicalType>

The logical type of this SchemaElement

LogicalType replaces ConvertedType, but ConvertedType is still required for some logical types to ensure forward-compatibility in format v1.

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impl SchemaElement

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pub fn new<F1, F2, F3, F5, F6, F7, F8, F9, F10>( type_: F1, type_length: F2, repetition_type: F3, name: String, num_children: F5, converted_type: F6, scale: F7, precision: F8, field_id: F9, logical_type: F10 ) -> SchemaElement

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pub fn read_from_in_protocol<T: TInputProtocol>( i_prot: &mut T ) -> Result<SchemaElement>

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pub async fn stream_from_in_protocol<T: TInputStreamProtocol>( i_prot: &mut T ) -> Result<SchemaElement>

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pub fn write_to_out_protocol<T: TOutputProtocol>( &self, o_prot: &mut T ) -> Result<usize>

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pub async fn write_to_out_stream_protocol<T: TOutputStreamProtocol>( &self, o_prot: &mut T ) -> Result<usize>

Trait Implementations§

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impl AsyncReadThrift for SchemaElement

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fn stream_from_in_protocol<'life0, 'async_trait, T>( i_prot: &'life0 mut T ) -> Pin<Box<dyn Future<Output = Result<SchemaElement>> + Send + 'async_trait>>
where T: 'async_trait + TInputStreamProtocol, 'life0: 'async_trait,

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impl Clone for SchemaElement

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fn clone(&self) -> SchemaElement

Returns a copy 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 SchemaElement

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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 Hash for SchemaElement

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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 Ord for SchemaElement

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fn cmp(&self, other: &SchemaElement) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for SchemaElement

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for SchemaElement

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fn partial_cmp(&self, other: &SchemaElement) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl ReadThrift for SchemaElement

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impl Eq for SchemaElement

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impl StructuralPartialEq for SchemaElement

Auto Trait Implementations§

Blanket 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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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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> 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.