Add datetime and timespan hash index declarations. Use float8 for both;  certainly OK for datetime since it is a float8 and should be OK for  timespan since the first field within timespan is a float8. Use float8 hash function for time type (rather than char8).
Add datetime and timespan hash index declarations. Use float8 for both;
 certainly OK for datetime since it is a float8 and should be OK for
 timespan since the first field within timespan is a float8.
Use float8 hash function for time type (rather than char8).

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