SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Asterisk
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier _part_offset
      Function equals (children 1)
       ExpressionList (children 2)
        Function isNullable (children 1)
         ExpressionList (children 1)
          Literal UInt64_1
        Function toUInt128 (children 1)
         ExpressionList (children 1)
          Literal UInt64_6
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_simple_projection
   Function equals (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Literal UInt64_101
       Identifier user_id
     Function ignore (children 1)
      ExpressionList (children 2)
       Literal UInt64_255
       Function isZeroOrNull (children 1)
        ExpressionList (children 1)
         Function assumeNotNull (children 1)
          ExpressionList (children 1)
           Literal UInt64_0
   Function and (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Literal UInt64_106
       Identifier user_id
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier region
       Literal \'us_west\'
