Struct substrait_validator::input::proto::substrait::expression::MaskExpression

pub struct MaskExpression {
    pub select: Option<StructSelect>,
    pub maintain_singular_struct: bool,
}

A reference that takes an existing subtype and selectively removes fields from it. For example, one might initially have an inner struct with 100 fields but a a particular operation only needs to interact with only 2 of those 100 fields. In this situation, one would use a mask expression to eliminate the 98 fields that are not relevant to the rest of the operation pipeline.

Note that this does not fundamentally alter the structure of data beyond the elimination of unecessary elements.

Fields

select: Option<StructSelect>

maintain_singular_struct: bool

Trait Implementations

impl Clone for MaskExpression

fn clone(&self) -> MaskExpression

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MaskExpression

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

Formats the value using the given formatter.

impl Default for MaskExpression

fn default() -> Self

Returns the “default value” for a type.

impl InputNode for MaskExpression

fn type_to_node() -> Node

Creates an empty output node for a protobuf datum of this type.

fn data_to_node(&self) -> Node

Creates an empty output node for a protobuf datum with this value.

fn oneof_variant(&self) -> Option<&'static str>

Returns the name of the selected variant of a oneof field, if this is a rust enum used to represent a oneof field.

fn parse_unknown(&self, y: &mut Context<'_>) -> bool

Complete the subtrees of this datum in output that have not already been parsed using UnknownField nodes. Returns whether any such nodes were added.

impl Message for MaskExpression

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError> where
    B: BufMut, 

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8, Global>

Encodes the message to a newly allocated buffer.

fn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError> where
    B: BufMut, 

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8, Global>

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode<B>(buf: B) -> Result<Self, DecodeError> where
    B: Buf,
    Self: Default, 

Decodes an instance of the message from a buffer.

fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError> where
    B: Buf,
    Self: Default, 

Decodes a length-delimited instance of the message from the buffer.

fn merge<B>(&mut self, buf: B) -> Result<(), DecodeError> where
    B: Buf, 

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError> where
    B: Buf, 

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq<MaskExpression> for MaskExpression

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl ProtoMessage for MaskExpression

fn proto_message_type() -> &'static str

Returns the protobuf type name for messages of this type.

impl StructuralPartialEq for MaskExpression