/**
* In some case, outer join results can be determined only after all inner
* join results are constructed, because, in order to build outer join result,
* we need to know the rows from one side that cannot be matched by rows from
* the other side. If inner join part has not finished, we cannot know whether
* there will be a match later.
*/
bool AbstractJoinExecutor::BuildOuterJoinOutput() {
PL_ASSERT(join_type_ != JoinType::INVALID);
switch (join_type_) {
case JoinType::LEFT: { return BuildLeftJoinOutput(); }
case JoinType::RIGHT: { return BuildRightJoinOutput(); }
case JoinType::OUTER: {
bool status = BuildLeftJoinOutput();
if (status == true) {
return status;
} else {
return BuildRightJoinOutput();
}
break;
}
case JoinType::INNER: { return false; }
default: {
throw Exception("Unsupported join type : " + JoinTypeToString(join_type_));
break;
}
}
return false;
}
/**
* In some case, outer join results can be determined only after all inner
* join results are constructed, because, in order to build outer join result,
* we need to know the rows from one side that cannot be matched by rows from
* the other side. If inner join part has not finished, we cannot know whether
* there will be a match later.
*/
bool AbstractJoinExecutor::BuildOuterJoinOutput() {
assert(join_type_ != JOIN_TYPE_INVALID);
switch (join_type_) {
case JOIN_TYPE_LEFT: {
return BuildLeftJoinOutput();
}
case JOIN_TYPE_RIGHT: {
return BuildRightJoinOutput();
}
case JOIN_TYPE_OUTER: {
bool status = BuildLeftJoinOutput();
if (status == true) {
return status;
} else {
return BuildRightJoinOutput();
}
break;
}
case JOIN_TYPE_INNER: {
return false;
}
default: {
throw Exception("Unsupported join type : " + std::to_string(join_type_));
break;
}
}
return false;
}
