abs function
Applies to: 
Databricks SQL Databricks Runtime 10.4 LTS and above
Returns the absolute value of the numeric value in expr.
Syntax
abs(expr)
Arguments
expr: An expression that evaluates to a numeric or interval.
Returns
A numeric or interval of the same type as expr.
For integral numeric types the function can return an ARITHMETIC_OVERFLOW error.
Warning
In Databricks Runtime if spark.sql.ansi.enabled is false, an overflow does not cause an error but “wraps” the result instead.
Examples
> SELECT abs(-1);
1
> SELECT abs(cast(-32768 AS Smallint))
Error: ARITHMETIC_OVERFLOW