reason from output:
4 Query: SelectQuery .
    5      | SelectQuery . LIMIT INTEGER
   17 UnionQuery: SelectQuery .
    LIMIT  shift, and go to state 16
    $end      reduce using rule 4 (Query)
    $end      [reduce using rule 17 (UnionQuery)]
    LIMIT     [reduce using rule 17 (UnionQuery)]
    $default  reduce using rule 4 (Query)
solution: add '('')' around state 17

parse tree cannot be built for AND queries

todo: fix conflict rule

create_not_operator second param necessary?

todo: build parse tree

todo: ELIM, LIMIT, AS

SQLP parser with cons cells

See merge request !1