How Can I Store uint64 Hash Values in PostgreSQL\'s BIGINT Despite Size Limitations?

Overflowing Integers Intentionally for PostgreSQL Storage

In the context of storing uint64 hash values, which exceed the size of PostgreSQL's BIGINT data type (signed 64 bits), a common solution is to convert the uint64 to int64 by simply changing the type without altering the binary representation.

Solution:

i := uint64(0xffffffffffffffff)
i2 := int64(i)

Using this type conversion, the uint64 value is assigned to an int64 variable while maintaining its original binary representation. This is possible because the conversion does not change the memory representation of the value, only its type.

Output:

18446744073709551615 -1

Converting a uint64 to int64 is always successful, regardless of the value. However, it's important to note that converting an untyped integer constant value to int64 can result in a compile-time error if it exceeds the maximum value that can be represented by int64 (0x7fffffffffffffff).

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