Enum RelExpr

pub enum RelExpr {
    RelVar(Arc<TableSchema>, Box<str>),
    Select(Box<RelExpr>, Expr),
    LeftDeepJoin(LeftDeepJoin),
    EqJoin(LeftDeepJoin, FieldProject, FieldProject),
}

A logical relational expression

Variants

RelVar(Arc<TableSchema>, Box<str>)

A relvar or table reference

Select(Box<RelExpr>, Expr)

A logical select for filter

LeftDeepJoin(LeftDeepJoin)

A left deep binary cross product

EqJoin(LeftDeepJoin, FieldProject, FieldProject)

A left deep binary equi-join

Implementations

impl RelExpr

pub fn nfields(&self) -> usize

The number of fields this expression returns

pub fn has_field(&self, field: &str) -> bool

Does this expression return this field?

pub fn table_id(&self, var: Option<&str>) -> Option<TableId>

What is the TableId for this expression or relvar?

Trait Implementations

impl Debug for RelExpr

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

Formats the value using the given formatter.