Tabix does not return the correct regions

[hiruna72]

Hi developers,

Let's say I have the following file

S1	5	1	R1
S1	15	5	R2

I create a tabix index like follows

bgzip table.txt --keep -f
tabix -0 -b 3 -e 2 -s 1 table.txt.gz -f

Then I query the file

$ tabix table.txt.gz S1
S1	5	1	R1
S1	15	5	R2

$ tabix table.txt.gz S1:1-5
S1	5	1	R1

$ tabix table.txt.gz S1:2-5
S1	5	1	R1

$ tabix table.txt.gz S1:3-5
no records were printed. should have printed (S1	5	1	R1)

Similarly

$ tabix table.txt.gz S1:5-15
S1	15	5	R2

$ tabix table.txt.gz S1:6-15
S1	15	5	R2

$ tabix table.txt.gz S1:7-15
no records were printed. should have printed (S1	15	5	R2)

As shown above in both cases tabix did not print the valid records in the given region.

Thank you.

[kisarur]

I could reproduce the same issue. However, if columns 2 and 3 are swapped as below (table2.txt), I could get the expected the results. I used the latest commit in develop branch. I assume the problem is in the indexing part (tabix).

S1	1	5	R1
S1	5	15	R2

Then you create a tabix index

$ bgzip table2.txt --keep -f
$ tabix -0 -b 2 -e 3 -s 1 table2.txt.gz -f

Then query

$ tabix table2.txt.gz S1:3-5
S1	1	5	R1
$ tabix table2.txt.gz S1:7-15
S1	5	15	R2

[whitwham]

It looks like that bug has been there since the beginning.