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Author SHA1 Message Date
Goutham Veeramachaneni 2fa647f50b Fix missing postings in Merge and Intersect (#77) 
* Test for a previous implematation of Intersect

Before we were moving the postings list everytime we create a new
chained `intersectPostings`. That was causing some postings to be
skipped. This test fails on the older version.

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>

* Advance on Seek only when valid.

Issue:
Before in mergedPostings and others we advance everytime we `Seek`,
which causes issues with `Intersect`.

Take the case, where we have a mergedPostings = m merging, a: {10, 20, 30} and
b: {15, 25, 35}. Everytime we `Seek`, we do a.Seek and b.Seek.

Now if we Intersect m with {21, 22, 23, 30}, we would do Seek({21,22,23}) which
would advance a and b beyond 30.

Fix:
Now we advance only when the seeking value is greater than the current
value, as the definition specifies.

Also, posting 0 will not be a valid posting and will be used to signal
finished or un-initialized PostingsList.

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>

* Add test for Merge+Intersect edgecase.

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>

* Add comments to trivial tests.

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>
 2017-05-12 09:44:41 +02:00
Tomasz Elendt d7ad9d2679 Fix various postings implementations 
* newIntersectPostings and newMergePostings should not advance passed
  postings automatically.
* listPostings and bigEndianPostings should not panic with index out
  of range when At() is called before Next()/Seek().
* Seek() call should advance listPostings/bigEndianPostings.
 2017-04-24 23:07:06 +02:00
Fabian Reinartz a5322c50fc Merge pull request #36 from Gouthamve/tests 
Tests For Querier and Postings
 2017-04-24 10:50:59 +02:00
Goutham Veeramachaneni 725b69caa1
Incorporate feedback on #36 
Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>
 2017-04-22 01:38:26 +05:30
Fabian Reinartz 778103b450 Add liecence file and headers 2017-04-10 20:59:45 +02:00
Goutham Veeramachaneni f8a8b77976
postings: Fix bad test and revert changed logic 
A bad test was introduced a couple of commits ago which also made
changes to pass the bad test. Fixed the test and revert the changes.

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>
 2017-04-09 17:20:39 +05:30
Goutham Veeramachaneni 329dc1fa6c
Add Tests For mergedPostings.Seek 
* Renamed mergedPostings to make it consistent across the repo
* Fixed bug with Seek
* Added Tests for Seek

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>
 2017-04-08 20:42:29 +05:30
Goutham Veeramachaneni 141499ff19
Add Tests For bigEndianPostings 2017-03-27 15:46:55 +05:30
Fabian Reinartz 286293802b Add merge postings 2016-12-28 11:02:19 +01:00
Fabian Reinartz ab7fbc05ad Zero timestamp as base, use binary search list postings 2016-12-28 08:50:20 +01:00
Fabian Reinartz dd72b52098 Add postings intersection 2016-12-27 11:32:10 +01:00