Tableから Select * from table になる流れ
DatabaseAdapter#writeQuery https://github.com/squeryl/squeryl/blob/4dc8101ff8d88f892d3064868ab0081dac489ce4/src/main/scala/org/squeryl/internals/DatabaseAdapter.scala#L95
Query1#ast(f(sq1.sample), sq1) AbstractQuery#buildAst(qy: QueryYield[R], subQueryables: SubQueryable[_]*) Query1#sq1 = createSubQueryable(t1) AbstractQuery#createSubQueryable[U](q: Queryable[U])