SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier myTable (alias mt)
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier myDay
     Literal \'2021-01-02\'