Runkang He created CALCITE-6077:
-----------------------------------

             Summary: Add FACTORIAL functions (enabled in Hive and Spark 
library)
                 Key: CALCITE-6077
                 URL: https://issues.apache.org/jira/browse/CALCITE-6077
             Project: Calcite
          Issue Type: New Feature
          Components: core
    Affects Versions: 1.35.0
            Reporter: Runkang He


Add FACTORIAL functions (enabled in Hive and Spark library)
FACTORIAL(expr): Returns the factorial of expr. expr is [0..20]. Otherwise, 
returns NULL.
For example:

{code:sql}
SELECT factorial(5); 
>120
{code}

See more at 
[Hive|https://cwiki.apache.org/confluence/display/hive/languagemanual+udf#LanguageManualUDF-MathematicalFunctions]
 and [Spark|https://spark.apache.org/docs/latest/api/sql/index.html#factorial] 
doc.



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