Struct HashJoinRel

pub struct HashJoinRel {
    pub common: Option<RelCommon>,
    pub left: Option<Box<Rel>>,
    pub right: Option<Box<Rel>>,
    pub left_keys: Vec<FieldReference>,
    pub right_keys: Vec<FieldReference>,
    pub keys: Vec<ComparisonJoinKey>,
    pub post_join_filter: Option<Box<Expression>>,
    pub type: i32,
    pub advanced_extension: Option<AdvancedExtension>,
}

The hash equijoin join operator will build a hash table out of the right input based on a set of join keys. It will then probe that hash table for incoming inputs, finding matches.

Two rows are a match if the comparison function returns true for all keys

Fields

common: Option<RelCommon>

left: Option<Box<Rel>>

right: Option<Box<Rel>>

left_keys: Vec<FieldReference>

👎Deprecated

These fields are deprecated in favor of keys. If they are set then the two lists (left_keys and right_keys) must have the same length and the comparion function is considered to be SimpleEqualityType::EQ

right_keys: Vec<FieldReference>

👎Deprecated

keys: Vec<ComparisonJoinKey>

One or more keys to join on. The relation is invalid if this is empty (unless the deprecated left_keys/right_keys fields are being used).

If a custom comparison function is used then it must be consistent with the hash function used for the keys.

In other words, the hash function must return the same hash code when the comparison returns true. For example, if the comparison function is “equals ignoring case” then the hash function must return the same hash code for strings that differ only by case. Note: the hash function is not specified here. It is the responsibility of the consumer to find an appropriate hash function for a given comparsion function or to reject the plan if it cannot do so.

post_join_filter: Option<Box<Expression>>

type: i32

advanced_extension: Option<AdvancedExtension>

Implementations

impl HashJoinRel

pub fn type(&self) -> JoinType

Returns the enum value of type, or the default if the field is set to an invalid enum value.

pub fn set_type(&mut self, value: JoinType)

Sets type to the provided enum value.

Trait Implementations

impl Clone for HashJoinRel

fn clone(&self) -> HashJoinRel

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for HashJoinRel

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

Formats the value using the given formatter.

impl Default for HashJoinRel

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for HashJoinRel

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Message for HashJoinRel

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(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

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

where Self: Sized,

Encodes the message to a newly allocated buffer.

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

where Self: Sized,

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

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

where Self: Sized,

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

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

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

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

where Self: Sized,

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

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

where Self: Sized,

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

impl PartialEq for HashJoinRel

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for HashJoinRel

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for HashJoinRel