Struct ProjectSetSelectItem

pub struct ProjectSetSelectItem {
    pub select_item: Option<SelectItem>,
}

The items which can occur in the select list of ProjectSet operator.

When there are table functions in the SQL query SELECT ..., it will be planned as ProjectSet. Otherwise it will be planned as Project.

Examples

# Project
select 1;

# ProjectSet
select unnest(array\[1,2,3\]);

# ProjectSet (table function & usual expression)
select unnest(array\[1,2,3\]), 1;

# ProjectSet (multiple table functions)
select unnest(array\[1,2,3\]), unnest(array\[4,5\]);

# ProjectSet over ProjectSet (table function as parameters of table function)
select unnest(regexp_matches(v1, 'a(\d)c(\d)', 'g')) from t;

# Project over ProjectSet (table function as parameters of usual function)
select unnest(regexp_matches(v1, 'a(\d)c(\d)', 'g')) from t;

Fields

select_item: Option<SelectItem>

Implementations

impl ProjectSetSelectItem

pub fn get_select_item(&self) -> Result<&SelectItem, PbFieldNotFound>

Trait Implementations

impl Clone for ProjectSetSelectItem

fn clone(&self) -> ProjectSetSelectItem

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ProjectSetSelectItem

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

Formats the value using the given formatter.

impl Default for ProjectSetSelectItem

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ProjectSetSelectItem

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

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Message for ProjectSetSelectItem

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 ProjectSetSelectItem

fn eq(&self, other: &ProjectSetSelectItem) -> 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 ProjectSetSelectItem

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 ProjectSetSelectItem