Marios Trivyzas b078e2970c
SQL: Implement null safe equality operator <=> (#35873)
This operator handles nulls in different way than the normal `=`.
If one of the operants is `null` and the other not it returns `false`.
If both operants are `null` it returns `true`. Therefore in contrary to
`=`, which returns `null` if at least one of the operants is `null`, this one
never returns `null` as a result.

Closes: #35871
2018-11-26 14:02:02 +01:00
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