ATN2 function takes the arguments reversed

[niroboo]

According to the documentation for ATN2 the first argument is numeric_expr_y and the second argument is numeric_expr_x and should equate to arctangent of y/x.

After testing I found out that cosmosdb-server has the arguments reversed.

Example from documentation:

SELECT VALUE {
    arctangentInRadians: ATN2(35.175643, 129.44)
}

[
  {
    "arctangentInRadians": 0.265344532064832
  }
]

A test I wrote to verify the behavior:

    describe('ATN2', () => {
      it('should support ATN2()', async () => {
        const y = 35.175643;
        const x = 129.44;
        const v = Math.atan2(y, x);

        const query = `SELECT ATN2(${y}, ${x}) as atn2`;
        const { resources } = await container.items.query(query).fetchAll();
        expect(resources[0].atn2).toBeCloseTo(v);
      });
    });

When I flip y and x it does work:

const query = `SELECT ATN2(${x}, ${y}) as atn2`; // Purposely flipped y/x