SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_table_nullable
   Function notEquals (children 1)
    ExpressionList (children 2)
     Function dictGet (children 1)
      ExpressionList (children 3)
       Literal \'test_dictionary_load_factor_nullable\'
       Literal \'value\'
       Identifier key
     Identifier value
