spanbase_extent_transfn value_union_transfn

value_union_transfn() Set * value_union_transfn ( Set *  state, Datum  value, meosType  basetype  ) Transition function for set union aggregate of values. Parameters [in,out] state Current aggregate state [in] value Value [in] basetype Type of the value Returns When the state variable has space for adding the new value, the function returns the current state variable. Otherwise, a NEW state variable is returned and the input state is freed. Note Always use the function to overwrite the existing state as in: state = value_union_transfn(state, value, basetype);