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Applies to: 
Databricks SQL Databricks Runtime
Casts expr to boolean. This function is a synonym for CAST(expr AS binary). See cast function for details.
Syntax
boolean(expr)
Arguments
expr: Any expression that can be cast to BOOLEAN.
Returns
A BOOLEAN.
Examples
> SELECT boolean(1);
true
> SELECT boolean(0);
false
> SELECT boolean(2);
true