SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier action
    Identifier user
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier null_lc_set_index
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier user
     Literal \'alice\'
