Update doc

facebookincubator · Feb 17, 2024 · 98f569a · 98f569a
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diff --git a/velox/docs/functions/spark/conversion.rst b/velox/docs/functions/spark/conversion.rst
@@ -2,6 +2,8 @@
 Conversion Functions
 ====================
 
+Casting from UNKNOWN type to all other scalar types are supported, e.g., cast(NULL as int).
+
 Cast to Integral Types
 ----------------------