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Applies to: 
Databricks SQL Databricks Runtime
Returns expr1 if it's not NaN, or expr2 otherwise.
Syntax
nanvl(expr1, expr2)
Arguments
expr1: An expression that evaluates to a numeric.expr2: An expression that evaluates to a numeric.
Returns
A DOUBLE.
Examples
> SELECT nanvl(cast('NaN' AS DOUBLE), 123);
1.0