mmseqs createindex --split not generating correct number of splits #432
Description
Expected Behavior
I expect --split 16 for mmseqs createindex to generate 16 *.idx files. Instead, I'm getting 18:
mmseqs_tax_target/mmseqs_tax.db.idx.0
mmseqs_tax_target/mmseqs_tax.db.idx.1
mmseqs_tax_target/mmseqs_tax.db.idx.10
mmseqs_tax_target/mmseqs_tax.db.idx.11
mmseqs_tax_target/mmseqs_tax.db.idx.12
mmseqs_tax_target/mmseqs_tax.db.idx.13
mmseqs_tax_target/mmseqs_tax.db.idx.14
mmseqs_tax_target/mmseqs_tax.db.idx.15
mmseqs_tax_target/mmseqs_tax.db.idx.16
mmseqs_tax_target/mmseqs_tax.db.idx.17
mmseqs_tax_target/mmseqs_tax.db.idx.2
mmseqs_tax_target/mmseqs_tax.db.idx.3
mmseqs_tax_target/mmseqs_tax.db.idx.4
mmseqs_tax_target/mmseqs_tax.db.idx.5
mmseqs_tax_target/mmseqs_tax.db.idx.6
mmseqs_tax_target/mmseqs_tax.db.idx.7
mmseqs_tax_target/mmseqs_tax.db.idx.8
mmseqs_tax_target/mmseqs_tax.db.idx.9
Pipeline software (eg., snakemake) generally requires keeping track of all (important) output files produced; otherwise, untracked output files can accidentally be deleted, which is is causing some downstream problems (eg., seg-fault errors for mmseqs taxonomy).
Steps to Reproduce (for bugs)
mmseqs createindex --threads 8 --split 16 mmseqs_tax.db mmseqs_tax_target/tmp/
Your Environment
# Name Version Build Channel
_libgcc_mutex 0.1 conda_forge conda-forge
_openmp_mutex 4.5 1_gnu conda-forge
bzip2 1.0.8 h7f98852_4 conda-forge
ca-certificates 2021.1.19 h06a4308_1
gawk 5.1.0 h516909a_0 conda-forge
gettext 0.19.8.1 h0b5b191_1005 conda-forge
libffi 3.3 h58526e2_2 conda-forge
libgcc-ng 9.3.0 h2828fa1_18 conda-forge
libgomp 9.3.0 h2828fa1_18 conda-forge
libidn2 2.3.0 h516909a_0 conda-forge
libstdcxx-ng 9.3.0 h6de172a_18 conda-forge
libunistring 0.9.10 h14c3975_0 conda-forge
mmseqs2 13.45111 h95f258a_1 bioconda
openssl 1.1.1k h7f98852_0 conda-forge
pigz 2.6 h27826a3_0 conda-forge
seqkit 0.15.0 0 bioconda
seqtk 1.3 h5bf99c6_3 bioconda
wget 1.20.1 h22169c7_0 conda-forge
zlib 1.2.11 h516909a_1010 conda-forge
OS: Ubuntu 18.04.5