Treat timestamp as unsigned long in engine api fork validation #8221
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PR description
If the timestamp is set to
> 2^63 - 1 and <= 2^64 - 1 (UnsignedLong.MAX_VALUE = 18446744073709551615), then since we use a (signed) primitive long by default this can overflow and e.g. we interpret18446744073709551615as timestamp = -1This fixes some hive tests as part of #8177