Explain EXPLAIN QUERY TREE (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 1)
     Identifier value1
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier datetime_t
    Function and (children 1)
     ExpressionList (children 2)
      Function equals (children 1)
       ExpressionList (children 2)
        Function toYear (children 1)
         ExpressionList (children 1)
          Identifier date1
        Literal UInt64_1993
      Function and (children 1)
       ExpressionList (children 2)
        Function greaterOrEquals (children 1)
         ExpressionList (children 2)
          Identifier id
          Literal UInt64_1
        Function lessOrEquals (children 1)
         ExpressionList (children 2)
          Identifier id
          Literal UInt64_3
    Set
