SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    Identifier id
    Identifier attr1
    Identifier attr2
    Identifier vec
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
   ExpressionList (children 1)
    OrderByElement (children 1)
     Function L2Distance (children 1)
      ExpressionList (children 2)
       Identifier vec
       Literal Array_[Float64_0.2, Float64_0.3]
