Github user huaxingao commented on the issue:
https://github.com/apache/spark/pull/19256
Thanks @gatorsmile
Does the following logic look good to you?
```
if(any dialect's isCascadingTruncateTable returns true)
return Some(true)
else
if (any dialect's isCascadingTruncateTable returns false)
return Some(false)
else // None of the dialect implements this method, return the superclass
default value
return None
```
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