sql: fix a panic in concat_ws() and support a NULL separator. #10309
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Prior to this patch concat_ws() without arguments would panic. Reported by @nathanejohnson. Also this supports a NULL separator properly: concatenation with a NULL separator produces a NULL result.
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Prior to this patch concat_ws() without arguments would panic.
Reported by @nathanejohnson.
Also this supports a NULL separator properly: concatenation with
a NULL separator produces a NULL result.
This change is