InsertQuery   (children 2)
 Identifier tab
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 3)
     Literal Array_[\'a1\', \'a2\']
     Literal Array_[Array_[UInt64_1, UInt64_2, UInt64_3], Array_[UInt64_4, UInt64_5, UInt64_6]]
     Literal Array_[Array_[\'b1\', \'b2\', \'b3\'], Array_[\'b4\', \'b5\', \'b6\']]
