Enum ProjectName

pub enum ProjectName {
    None(RelExpr),
    Some(RelExpr, Box<str>),
}

A projection is the root of any relational expression. This type represents a projection that returns relvars.

For example:

select * from t

and

select t.* from t join s ...

Variants

None(RelExpr)

Some(RelExpr, Box<str>)

Implementations

impl ProjectName

pub fn unwrap(self) -> RelExpr

Unwrap the outer projection, returning the inner expression

pub fn return_name(&self) -> Option<&str>

What is the name of the return table? This is either the table name itself or its alias.

pub fn return_table(&self) -> Option<&TableSchema>

The TableSchema of the returned rows. Note this expression returns rows from a relvar. Hence it this method should never return None.

pub fn return_table_id(&self) -> Option<TableId>

The TableId of the returned rows. Note this expression returns rows from a relvar. Hence it this method should never return None.

pub fn for_each_return_field(&self, f: impl FnMut(&str, &AlgebraicType))

Iterate over the returned column names and types

Trait Implementations

impl Debug for ProjectName

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

Formats the value using the given formatter.

impl PartialEq for ProjectName

fn eq(&self, other: &ProjectName) -> 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 Eq for ProjectName

impl StructuralPartialEq for ProjectName