Affects Version/s: None
Fix Version/s: 1.7.0
There are hash functions in Utilities.hash and Util.hash and spread throughout the code, e.g. in ColumnMetaData and ClassDeclaration (search for uses of Object.hashCode).
- Some multiply by 37; I'm not sure that all CPUs can multiply by 37 in one instruction; switch to a mersenne prime (2 ^ n - 1).
- Util.hash uses shift and xor. Change that to multiply by a prime.
- Lists should continue to multiply by 31 to be consistent with java.util.List.
- Deprecate Util.hash methods and use Utilities.hash instead.
Changing hash functions may cause some test output to change; be prepared for that.