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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).
atan2(exprY, exprX)
exprY: An expression that evaluates to a numeric.exprX: An expression that evaluates to a numeric.
A DOUBLE.
> SELECT atan2(0, 0);
1.0