Struct CreateIndexSpec 

pub struct CreateIndexSpec<'a> {
    pub unique: Uniqueness,
    pub if_not_exists: IfNotExists,
    pub database: Option<NameId>,
    pub name: NameId,
    pub table: NameId,
    pub using: Option<NameId>,
    pub columns: &'a [IndexedColumn],
    pub settings: &'a [Vec<u8>],
    pub filter: Option<ExprId>,
}

Everything a CREATE INDEX statement names.

The grammar’s own fields, gathered rather than passed as nine positional arguments of which two were adjacent booleans.

Fields

unique: Uniqueness

Whether the index refuses a repeated key.

if_not_exists: IfNotExists

What to do when the index is already there.

database: Option<NameId>

The schema the index is created in, when one was written.

name: NameId

The index’s name.

table: NameId

The table it is over.

using: Option<NameId>

The module named by USING, for the extension index forms.

columns: &'a [IndexedColumn]

The indexed columns, in key order.

settings: &'a [Vec<u8>]

The WITH settings, as written.

filter: Option<ExprId>

The WHERE of a partial index, as an expression of the statement.