Hi, Jong, The function ibis::column::indexSize is not a reliable way to tell whether an index has been built. In your particular case, the index is most likely not built. Since you are playing with in-memory data, the attached example might be a good starting point.
John
On 3/19/13 1:28 PM, Jong Choi wrote:
> Hi,
>
> I am trying to verify if an index is there before querying but haven't
> found a good solution yet. So far, I tried to see
> ibis::column::indexSize() but I got "-1". Is there any good way to
> check such thing?
>
> Just for your reference, here is part of my code:
>
> std::auto_ptr<ibis::tablex> ta(ibis::tablex::create());
> int buf[] = {10, -21, 32, -43, 54, -65, 76, -87, 98, -127};
>
> ta->addColumn("col1", ibis::INT);
> ta->append("col1", 0, 10, buf);
>
> std::auto_ptr<ibis::table> tb(ta->toTable());
> tb->buildIndex("col1");
>
> ibis::constPartList parts;
> int ierr = tb->getPartitions(parts);
> assert(ierr > 0);
>
> for (ibis::constPartList::const_iterator it = parts.begin(); it !=
> parts.end(); ++it)
> {
> ibis::part::info *info = (*it)->getInfo();
> std::clog << "name :" << info->name << std::endl;
>
> int nColumns = (*it)->nColumns();
> for (int i = 0; i < nColumns; i++)
> {
> ibis::column * col = (*it)->getColumn(i);
> std::clog << "size :" << col->indexSize() << std::endl;
> }
> }
>
> // Query
> ibis::table* res = tb->select("val", "val > 0");
> ...
>
> I will appreciate any advice or help.
>
> Thanks,
>
> Jong
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