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LISTAGG - Add parameter for length and allow less than 4000
The new LISTAGG function is very convenient. Two things that have us scratching our heads though: (1) Why does the length have an arbitrary minimum of 4000? (2) Why is setting a different length done by a CAST of the input instead of just adding a 3rd parameter with the desired length? This would seem a lot cleaner and clearer.
We can think of many places where we can eliminate application code to manually assemble list items with this, but few of them are even close to 4000 characters wide. Example: In a simple list we might want to limit to 80 characters and get the convenient count of truncated items without having to fetch everything into our application and then process it.
The CAST operation to change the length longer is also not intuitive vs. having an explicit parameter and makes the code a lot harder to read.
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