Enum Suggestion 

#[repr(u32)]
pub enum Suggestion {
    Variable = 0,
    CatalogName = 1,
    SchemaName = 2,
    TableName = 3,
    ColumnName = 4,
    ScalarFunctionName = 5,
    TableFunctionName = 6,
    TypeName = 7,
    PragmaName = 8,
    SettingName = 9,
    FileName = 10,
}

What an identifier matcher was built to suggest.

Kept rather than reduced to the two answers it implies, because upstream derives both from it and keeping the derivation in one place is how the two stay comparable. identifier_matcher.hpp is the source.

Variants

Variable = 0

CatalogName = 1

SchemaName = 2

TableName = 3

ColumnName = 4

ScalarFunctionName = 5

TableFunctionName = 6

TypeName = 7

PragmaName = 8

SettingName = 9

FileName = 10

Implementations

impl Suggestion

pub const fn allowed_class(self) -> u8

Which keyword class may be used as a bare word here, on top of unreserved.

Type name positions allow the type name class, both function name positions allow the combined type and function class, and everything else allows the column name class. That TypeFuncKeyword <- TypeNameKeyword / FuncNameKeyword is a rule in the grammar and also a category in the matcher is not a coincidence, it is the same union written once. ParsedGrammarKeywordHelper’s constructor holds a table of five rule names against five keyword sets, and the entry for typefunc_keyword_map names that rule, which it then walks through its references to collect the words. So the category is not a sixth list somebody has to keep in step with the other five, it is what that one line of the grammar says.

pub const fn supports_string_literal(self) -> bool

Whether a single quoted string is accepted where this name is expected.

Two positions only. FROM 'file.parquet' is the reason, and SELECT 'x' FROM t staying a string literal rather than becoming a column reference is the reason it is only two.

Trait Implementations

impl Clone for Suggestion

fn clone(&self) -> Suggestion

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Suggestion

impl Debug for Suggestion

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

Formats the value using the given formatter.

impl Eq for Suggestion

impl PartialEq for Suggestion

fn eq(&self, other: &Suggestion) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Suggestion