Typescript type for Select.distinct does not match runtime value when parsing Snowflake SQL

[chris-codaio]

Describe the bug
Typescript type for Select.distinct does not match runtime value when parsing Snowflake SQL.

Database Engine
Snowflake

To Reproduce
node-sql-parser version: 5.3.4
node version: 22.11.0

parser.astify('SELECT * from foo;', {database: 'Snowflake'});

[
  {
    with: null,
    type: 'select',
    options: null,
    distinct: { type: null },
    columns: [ [Object] ],
    into: { position: null },
    from: [ [Object] ],
    where: null,
    groupby: null,
    having: null,
    qualify: null,
    orderby: null,
    top: null,
    limit: { seperator: '', value: [] },
    window: null
  }
]

Expected behavior
Declared type as follows. Note that distinct should be the string DISTINCT or null, but is {type: null} at runtime.

export interface Select {
  with: With[] | null;
  type: "select";
  options: any[] | null;
  distinct: "DISTINCT" | null;
  columns: any[] | Column[];
  from: From[] | TableExpr | null ;
  where: Binary | Function | null;
  groupby: { columns: ColumnRef[] | null, modifiers: ValueExpr<string>[] };
  having: any[] | null;
  orderby: OrderBy[] | null;
  limit: Limit | null;
  window?: WindowExpr;
  qualify?: any[] | null;
  _orderby?: OrderBy[] | null;
  _limit?: Limit | null;
  parentheses_symbol?: boolean;
  _parentheses?: boolean;
  loc?: LocationRange;
  _next?: Select;
  set_op?: string;
}

As a side note, there are some other mismatched/broken types in here. Examples include:

• options is any-typed. Can we strongly type it?
• columns is carrying an any[] option - can we eliminate that in favor of strong typing?
• groupby is declared as being a mandatory object, but we see null at runtime.
• having is any-typed. Can we strongly type it?
• qualify is declared as any[] | null | undefined. Why does that field support both null and undefined when the others don't? Can we strongly type the any[] away?
• limit is returned with a useless object at runtime, but should probably be null?
• window is declared as window?: WindowExpr, but we see null at runtime. Maybe fix the type to be window: WindowExpr | null to match the other fields?
• Why have both _limit and limit? Same with orderby and _orderby?