https://github.com/ClickHouse/ClickHouse/blob/9a48cf0da8badfc5f3da08611eb44961aa28e3f6/src/Functions/FunctionsHashing.h#L669-L671

There's a call to `blake3_free_char_pointer` that passes ownership of the pointer back to Rust (which then frees the memory), then there's a call to `std::string`'s constructor that accepts that now-freed pointer.
extern const int LOGICAL_ERROR;
    extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
    extern const int NOT_IMPLEMENTED;
    extern const int ILLEGAL_COLUMN;
    extern const int SUPPORT_IS_DISABLED;
}
/** Hashing functions.
  *
  * halfMD5: String -> UInt64
  *
  * A faster cryptographic hash function:
  * sipHash64: String -> UInt64
  *
  * Fast non-cryptographic hash function for strings:
  * cityHash64: String -> UInt64
  *
  * A non-cryptographic hashes from a tuple of values of any types (uses respective function for strings and intHash64 for numbers):
  * cityHash64: any* -> UInt64
  * sipHash64: any* -> UInt64
  * halfMD5: any* -> UInt64
  *
  * Fast non-cryptographic hash function from any integer:
  * intHash32: number -> UInt32
  * intHash64: number -> UInt64
  *
  */
struct IntHash32Impl
{
    using ReturnType = UInt32;
    static UInt32 apply(UInt64 x)