Comments (3)
jbx1279
commented on July 21, 2024
这个不太好搞。SPL有空序表对象，可以create一个返回。
但通常出现这种情况是计算结果就是空集（比如select后是空的），没有记录也就没有数据结构了。而且SPL支持混合数据结构，不像SQL那样要求结果集的数据结构是唯一的，也就不合适指定某种数据结构。
不过，大部分情况直接返回null问题也不大的，null可以继续后面的各种操作（new,derive,.... )，也不会报错，反正进一步结果还是null，只是没法有一个标题出现了。
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zoomafia
commented on July 21, 2024
感谢回复。似乎是不太好弄，可能中间某步就没数据了。现在主要是报表，如果没有结构报表就会报错，看来只能create空序表返回了
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zoomafia
commented on July 21, 2024
注意到select函数增加了一个@t选项可以保留结构
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