SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Identifier id
    Identifier attr1
    Identifier attr2
   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]
   Literal UInt64_20
