Struct ScopedTable 

pub struct ScopedTable {
    pub table: TableMetadata,
    pub start_index: usize,
    pub scope_level: usize,
    pub hidden_unqualified_columns: HashSet<String>,
    pub merged_column_partners: HashMap<String, usize>,
}

A table visible to expression name resolution.

Fields

table: TableMetadata

start_index: usize

scope_level: usize

Lexical nesting level; zero is the current SELECT and larger values are successively enclosing SELECT scopes.

hidden_unqualified_columns: HashSet<String>

Columns coalesced by a JOIN … USING or NATURAL JOIN. They remain addressable by a qualified right-hand reference, but are not candidates for an unqualified reference because the merged output column owns the name.

merged_column_partners: HashMap<String, usize>

For a column merged by USING or NATURAL, the output index of the other side. An unqualified reference to a merged name resolves to COALESCE(left, right) so that RIGHT and FULL joins report the key from whichever side is present instead of the left side’s NULL.

Implementations

impl ScopedTable

pub fn new(table: TableMetadata, start_index: usize) -> Self

pub fn hide_unqualified_columns(&mut self, columns: &[String])

pub fn merge_column_with(&mut self, column: &str, partner_index: usize)

Record that column is merged with the output column at partner_index.

Trait Implementations

impl Clone for ScopedTable

fn clone(&self) -> ScopedTable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ScopedTable

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

Formats the value using the given formatter.