QLever CLI Ignores FORMAT Field in Qleverfile

[MPvHarmelen]

Summary

QLever CLI version 0.5.32 ignores FORMAT = nq in Qleverfile and defaults to -F ttl, causing index build failures for N-Quads data.

Reproduction Steps

1. Create data.nq:

<http://example.com/s1> <http://example.com/p> "Value 1" <http://example.com/g1> .
<http://example.com/s2> <http://example.com/p> "Value 2" <http://example.com/g1> .
<http://example.com/s3> <http://example.com/p> "Value 3" <http://example.com/g2> .

2. Create Qleverfile:

[data]
NAME = format-bug-test

[index]
INPUT_FILES = data.nq
CAT_INPUT_FILES = cat data.nq
FORMAT = nq

3. Run qlever index

Expected Behavior

Index builds successfully using -F nq flag (as specified in Qleverfile).

Actual Behavior

Index build fails with parse error. Docker command shows -F ttl instead of -F nq:

docker run ... -c 'cat data.nq | IndexBuilderMain ... -F ttl -f - | ...'
ERROR: Parse error at byte position 75: Parsing failed before end of input

Workaround

Pass format explicitly on command line:

qlever index --format nq

This correctly uses -F nq and builds successfully.

Environment

• QLever CLI: 0.5.32
• Platform: Linux with Docker

[hannahbast]

@MPvHarmelen FORMAT belongs into the [data] section, not into the [index] section. See https://docs.qlever.dev/qleverfile/#section-data