H2 数据库上的 SQL 查询抛出带有 count 子句的 ArrayIndexOutOfBoundsException

Question

我想按 count(favorite.favorite_id) 显示结果顺序并使用基于光标的分页。

但是，当我在查询中添加 'have count()' 子句时，我发现了 ArrayIndexOutOfBoundsException。

select
        album0_.album_id as col_0_0_,
        count(favoriteli2_.favorite_id) as cnt,
        user1_.user_id as user_id1_8_1_,
        album0_.album_id as album_id1_0_0_,
        album0_.create_date as create_d2_0_0_,
        album0_.modify_date as modify_d3_0_0_,
        album0_.description as descript4_0_0_,
        album0_.thumbnail as thumbnai5_0_0_,
        album0_.title as title6_0_0_,
        album0_.user_id as user_id8_0_0_,
        album0_.version as version7_0_0_,
        user1_.code as code2_8_1_,
        user1_.introduction as introduc3_8_1_,
        user1_.name as name4_8_1_,
        user1_.pic as pic5_8_1_
    from
        album album0_
    inner join
        user user1_
            on album0_.user_id=user1_.user_id
    left outer join
        favorite favoriteli2_
            on album0_.album_id=favoriteli2_.album_id
    group by
        album0_.album_id
    order by
        cnt desc, album0_.album_id desc

上面的查询工作正常。

select
        album0_.album_id as col_0_0_,
        count(favoriteli2_.favorite_id) as cnt,
        user1_.user_id as user_id1_8_1_,
        album0_.album_id as album_id1_0_0_,
        album0_.create_date as create_d2_0_0_,
        album0_.modify_date as modify_d3_0_0_,
        album0_.description as descript4_0_0_,
        album0_.thumbnail as thumbnai5_0_0_,
        album0_.title as title6_0_0_,
        album0_.user_id as user_id8_0_0_,
        album0_.version as version7_0_0_,
        user1_.code as code2_8_1_,
        user1_.introduction as introduc3_8_1_,
        user1_.name as name4_8_1_,
        user1_.pic as pic5_8_1_
    from
        album album0_
    inner join
        user user1_
            on album0_.user_id=user1_.user_id
    left outer join
        favorite favoriteli2_
            on album0_.album_id=favoriteli2_.album_id
    group by
        album0_.album_id
    having 
        count(favoriteli2_.favorite_id) < 2  --this causes the problem
    order by
        cnt desc, album0_.album_id desc

但是这个有 count() 子句的行不通。

下面是发生ArrayIndexOutOfBoundsException的方法。 [org.h2.command.dml.Select.updateAgg(Select.java:542)]

/**
 * Update any aggregate expressions with the query stage.
 * @param columnCount number of columns
 * @param stage see STAGE_RESET/STAGE_GROUP/STAGE_WINDOW in DataAnalysisOperation
 */
void updateAgg(int columnCount, int stage) {
    for (int i = 0; i < columnCount; i++) {
        if ((groupByExpression == null || !groupByExpression[i])
                && (groupByCopies == null || groupByCopies[i] < 0)) {
            Expression expr = expressions.get(i);
            expr.updateAggregate(session, stage);
        }
    }
}

columnCount = 16

groupByExpression：大小 16

groupByCopies：大小 15

表达式：大小 16（包含 15 个选定列，1 个比较（=count(favoriteli2_.favorite_id)

我认为“groupByCopies”是错误的原因。我该如何解决？

Answer 1

虽然 MySQL/MariaDB 允许这样做，但我认为 H2（与许多其他 SQL RDBMS 一样）希望 group by 具有所有非聚合列（使用 album_id 将它们全部添加到 group by）。所以我会尝试。您看到 Group By 逻辑引发的异常这一事实就是我倾向于这种方式的原因。