SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Literal UInt64_1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
   Function notEquals (children 1)
    ExpressionList (children 2)
     Function snowflakeToDateTime64 (children 1)
      ExpressionList (children 2)
       Function CAST (children 1)
        ExpressionList (children 2)
         Literal \'42\'
         Literal \'Int64\'
       Identifier tz
     Function now (children 1)
      ExpressionList
   Set