Re: CALCITE-2458 Use of Kotlin for unit tests
Julian>Consensus is a central concept in the Apache Way
https://www.apache.org/foundation/voting.html suggests to use whole numbers
when it comes to "code changes".
"Vetos" section is quite clear that vetos must be withdrawn before code
modification could be applied.
That provides an understandable machinery:
1) +1 is positive
2) -1 is negative (it is invalid and it has no weight without justification)