PLT OF A BEECH 35 BONANZA FLEW OVER THE TOP OF AN MDT TWIN JET COMMUTER TURNING OFF THE END OF THE RWY AFTER LNDG AT A NON CTLED ARPT.

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COLUMBUS APCH VECTORED ME N BECAUSE OF TFC (AN ACR FLT). I WAS TURNED E AND I HEARD THE OTHER ACFT 'CANCEL IFR.' I WAS DIRECTED TO THE LOC AND CLRED FOR THE APCH. I FOLLOWED THE LOC TO RWY 18. ON MY DSCNT; I SAW THE TWIN TURBINE ON THE RWY. I WAS A LONG WAY AWAY AND I HAD HIM IN SIGHT. HE WAS ON UNICOM 122.8 LONG BEFORE ME. WHEN I STARTED THE APCH AND CALLED ON 122.8; 'SMA ON THE LOC FOR RWY 18;' I NEVER HEARD A PEEP OUT OF ACR. HE ROLLED ALL THE WAY TO THE END TO TURN OFF AND IT WAS THERE I FLEW OVER HIM AND LANDED LONG. I DO NOT BELIEVE A VIOLATION OF FARS OCCURRED; SINCE THE ACR ACFT WAS EXITING THE RWY AS I PASSED THE LNDG THRESHOLD. IN CONTRAST; THE ACR PLT APPARENTLY BELIEVES OTHERWISE. HE SET THIS UP BY CANCELING IFR. I WOULD NEVER HAVE BEEN CLRED TO APCH IF HE HAD REMAINED IFR. SUMMARY: IF I HAD KNOWN THAT FLYING OVER ANOTHER ACFT TO BE A VIOLATION; I WOULD NOT HAVE DONE SO. THE ACR PLANE HAD CANCELED IFR TO KEEP FROM GOING THROUGH FURTHER PROC WITH APCH CTL. WHEN HE CANCELED; I WAS 'CLRED FOR THE APCH.' HE KNEW I WAS SOMEWHERE; BUT MADE NO ATTEMPT TO CONTACT ME OR TO MAKE HIS POS KNOWN (HE SAYS OTHERWISE). THIS HAS BEEN A MISERABLE UPSET TO ME. THE UPSET CAUSED BY THIS IS MUCH WORSE THAN ANY PENALTY I MAY BE ASSESSED. I WILL NEVER FLY OVER ANOTHER ACFT ON A RWY.