pub struct Scope {
pub items: Vec<ScopeItem>,
pub ungrouped_columns: Vec<ScopeUngroupedColumn>,
pub lateral_barrier: bool,
}
Fields§
§items: Vec<ScopeItem>
The items in this scope.
ungrouped_columns: Vec<ScopeUngroupedColumn>
The ungrouped columns in the scope.
lateral_barrier: bool
Implementations§
source§impl Scope
impl Scope
pub fn empty() -> Self
pub fn from_source<I, N>( table_name: Option<PartialItemName>, column_names: I ) -> Self
sourcepub fn column_names(&self) -> impl Iterator<Item = &ColumnName>
pub fn column_names(&self) -> impl Iterator<Item = &ColumnName>
Constructs an iterator over the canonical name for each column.
pub fn len(&self) -> usize
sourcepub fn items_from_table<'a>(
&'a self,
outer_scopes: &'a [Scope],
table: &PartialItemName
) -> Result<Vec<(ColumnRef, &'a ScopeItem)>, PlanError>
pub fn items_from_table<'a>( &'a self, outer_scopes: &'a [Scope], table: &PartialItemName ) -> Result<Vec<(ColumnRef, &'a ScopeItem)>, PlanError>
Returns all items from the given table name in the closest scope.
If no tables with the given name are in scope, returns an empty iterator.
NOTE(benesch): This is wrong for zero-arity relations, because we can’t distinguish between “no such table” and a table that exists but has no columns. The current design of scope makes this difficult to fix, unfortunately.
sourcepub fn resolve_column<'a>(
&'a self,
outer_scopes: &[Scope],
column_name: &ColumnName
) -> Result<ColumnRef, PlanError>
pub fn resolve_column<'a>( &'a self, outer_scopes: &[Scope], column_name: &ColumnName ) -> Result<ColumnRef, PlanError>
Resolves references to a column name to a single column, or errors if multiple columns are equally valid references.
sourcepub fn resolve_using_column(
&self,
column_name: &ColumnName,
join_side: JoinSide
) -> Result<ColumnRef, PlanError>
pub fn resolve_using_column( &self, column_name: &ColumnName, join_side: JoinSide ) -> Result<ColumnRef, PlanError>
Resolves a column name in a USING
clause.
pub fn resolve_table_column<'a>( &'a self, outer_scopes: &[Scope], table_name: &PartialItemName, column_name: &ColumnName ) -> Result<ColumnRef, PlanError>
pub fn resolve<'a>( &'a self, outer_scopes: &[Scope], table_name: Option<&PartialItemName>, column_name: &ColumnName ) -> Result<ColumnRef, PlanError>
sourcepub fn resolve_expr<'a>(&'a self, expr: &Expr<Aug>) -> Option<ColumnRef>
pub fn resolve_expr<'a>(&'a self, expr: &Expr<Aug>) -> Option<ColumnRef>
Look to see if there is an already-calculated instance of this expr. Failing to find one is not an error, so this just returns Option
pub fn product(self, right: Self) -> Result<Self, PlanError>
pub fn project(&self, columns: &[usize]) -> Self
pub fn table_names(&self) -> BTreeSet<&PartialItemName>
Trait Implementations§
Auto Trait Implementations§
impl Freeze for Scope
impl RefUnwindSafe for Scope
impl Send for Scope
impl Sync for Scope
impl Unpin for Scope
impl UnwindSafe for Scope
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