https://bugs.openldap.org/show_bug.cgi?id=10194
Issue ID: 10194
Summary: Does LMDB support zero length keys?
Product: LMDB
Version: 0.9.29
Hardware: All
OS: All
Status: UNCONFIRMED
Keywords: needs_review
Severity: normal
Priority: ---
Component: liblmdb
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I suspect the answer is 'No' but do not see a definitive statement.
I followed the Python code and documentation trail below, but decided to ask
here when I concluded I could not decide.
Some Python code was adapted from berkeleydb to lmdb and gave an exception for
a
cursor.set_range_dup(b'', <some value>) call. Reading the lmdb/cffi.py code in
site-packages prompted me to try cursor.set_range(b''), which seemed reasonable
given that is what is done for berkeleydb, and it worked.
However cursor.put(b'', <some value>) gave an exception quoting "mdb_put:
MDB_BAD_VALSIZE ...".
The documentation for the Python interface to LMDB at lmdb.readthedocs.io/
states behaviour for the empty bytestring for set_key(), set_key_dup(), and
set_range(); but not for set_range_dup() or put(). Only set_key() and
set_key_dup() describe empty bytestring as an error.
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