Marios Trivyzas 1da9c6faa0
SQL: Fix translation of math functions to painless (#35910)
`SIGN` and `RADIANS` where wrongly overriding `mathFunction()`.
Converted `mathFunction()` to private in `MathFunction` since it
shouldn't be overriden, as it uses the assigned `MathOperation`
to get the funtion name for painless scripts.

Fixes: #35654
2018-11-27 15:33:43 +01:00
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