try_sum
try_sum 介绍
try_sum(expr) - 从一组值中计算总和，如果发生溢出，则结果为null。
Examples:
> SELECT try_sum(col) FROM VALUES (5), (10), (15) AS tab(col);
30
> SELECT try_sum(col) FROM VALUES (NULL), (10), (15) AS tab(col);
25
> SELECT try_sum(col) FROM VALUES (NULL), (NULL) AS tab(col);
NULL
> SELECT try_sum(col) FROM VALUES (9223372036854775807L), (1L) AS tab(col);
NULLSince: 3.3.0