atan2 function
Applies to: 
Databricks SQL Databricks Runtime
Returns the angle in radians between the positive x-axis of a plane and the point specified by the coordinates (exprX, exprY).
Syntax
atan2(exprY, exprX)
Arguments
exprY: An expression that evaluates to a numeric.exprX: An expression that evaluates to a numeric.
Returns
A DOUBLE.
Examples
SQL
> SELECT atan2(0, 0);
0.0