Before calling this function, the general scratchpad must be allocated by a call to FNC_TblAllocCtx.
Do not store pointers in the scratchpad that reference other structures in the scratchpad, because the returned address of the scratchpad is not the same for subsequent invocations of the table function. Instead, use relative addressing, such as offsets from the current address of the scratchpad.
The general scratchpad is local to each copy of the table function for the current transaction or request running on each AMP vproc. It is not retained for subsequent transactions or requests.
Data changed in the scratchpad is retained for subsequent calls.