SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function notEquals (alias cond) (children 1)
     ExpressionList (children 2)
      Function arrayJoin (children 1)
       ExpressionList (children 1)
        Function array (children 1)
         ExpressionList (children 1)
          Identifier light
      Literal UInt64_0
    Function length (children 1)
     ExpressionList (children 1)
      Identifier heavy
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier prewhere
   Function and (children 1)
    ExpressionList (children 2)
     Function notEquals (children 1)
      ExpressionList (children 2)
       Identifier light
       Literal UInt64_0
     Function notEquals (children 1)
      ExpressionList (children 2)
       Identifier cond
       Literal UInt64_0