March 2017 - developers-list

Announcement: New Dec2016-SP3 Bugfix release of MonetDB suite
by Sjoerd Mullender 31 Mar '17

31 Mar '17

The MonetDB team at CWI/MonetDB BV is pleased to announce the Dec2016-SP3 bugfix release of the MonetDB suite of programs. More information about MonetDB can be found on our website at <http://www.monetdb.org/>. For details on this release, please see the release notes at <http://www.monetdb.org/Downloads/ReleaseNotes>. As usual, the download location is <http://dev.monetdb.org/downloads/>. Dec 2016-SP3 bugfix release MonetDB Common * Fixed a bug when appending string bats that are fully duplicate eliminated. It could happend that the to-be-appended bat had an empty string at an offset and at that same offset in the to-be-appended-to bat there happened to be a (sequence of) NULL(s). Then this offset would be used, even though it might nog be the right offset for the empty string in the to-be-appended-to bat. This would result in multiple offsets for the empty string, breaking the promise of being duplicate eliminated. Bug Fixes * 6138: Weak duplicate elimination in string heaps > 64KB * 6183: ResultSet returns double quoted column name if name contains space characters * 6216: Assertion raised (sqlsmith) * 6219: Crash in rel_optimizer (sqlsmith) * 6227: Monetdb fails on remote tables * 6228: mclient crashes if real column is multiplied by it itself * 6229: ANALYZE, unexpected end of input * 6230: ANALYZE, syntax error * 6237: semijoin with empty right bat does not return immediately * 6242: Crash on rel_reduce_groupby_exps (sqlsmith) * 6243: Static optimization gives wrong result (1 + NULL = -127) * 6245: Nested query crashes all versions of MonetDB or gives wrong result starting from Dec2016-SP2 * 6246: update statements: references to a table do not bind to its alias * 6247: Type analysis issue (sqlsmith) * 6248: update statements: the semantic stage does not resolve the relation in the from clause * 6250: Assertion failure when querying a Blob column with order by DESC * 6251: Crash after adding an ordered index on sys.statistics column and querying sys.statistics * 6253: FITS Data Vaults does not work when using user/pw and other than sys schema name

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BBP.dir file in MonetDB
by Senthil Vidhiyakar 31 Mar '17

31 Mar '17

Can someone tell me the need and file structure of BBP.dir file and the kind of information it contains.? Thank you, Senthil Vidhiyakar. S

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File system in MonetDB
by Senthil Vidhiyakar 30 Mar '17

30 Mar '17

I want to know the file system or how the data is stored in MonetDB. I know data for each column is stored in separate files. But I want to know what those .*thead *and .*tail *files inside BAT folder of the monetDB data folder mean and how data is stored in those files. Please help me ASAP. Thank you.

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Columnar Storage layout of MonetDB
by Senthil Vidhiyakar 21 Mar '17

21 Mar '17

I want to know the file layout of columnar data storage in MonetDB. I know each column is stored in separate files. Actually I want to know the exact layout as in a block diagram to get a clear picture of the storage layout. Helps are appreciated. Regards, Senthil Vidhiyakar. S

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Announcement: New Dec2016-SP2 Bugfix release of MonetDB suite
by Sjoerd Mullender 03 Mar '17

03 Mar '17

The MonetDB team at CWI/MonetDB BV is pleased to announce the Dec2016-SP2 bugfix release of the MonetDB suite of programs. More information about MonetDB can be found on our website at <http://www.monetdb.org/>. For details on this release, please see the release notes at <http://www.monetdb.org/Downloads/ReleaseNotes>. As usual, the download location is <http://dev.monetdb.org/downloads/>. Dec 2016-SP2 bugfix release Bug Fixes * 4034: argnames array in rapi.c has fixed length (that was too short) * 6080: mserver5: rel_bin.c:2391: rel2bin_project: Assertion `0' failed. * 6081: Segmentation fault (core dumped) * 6082: group.subgroup is undefined if group by is used on an expression involving only constants * 6111: Maximum number of digits for hge decimal is listed as 39 in sys.types. Should be 38 as DECIMAL(39) is not supported. * 6112: Crash upgrading Jul2015->Jun2016 * 6130: Query rewriter crashes on a NULL pointer when having a correlated subquery * 6133: A crash occurs when preparing an INSERT on joined tables during the query semantic phase * 6141: Getting an error message regarding a non-GROUP-BY column rather than an unknown identifier * 6177: Server crashes * 6186: Null casting causes no results (silent server crash?) * 6189: Removing a NOT NULL constraint from a PKey column should NOT be allowed * 6190: CASE query crashes database * 6191: MT_msync failed with "Cannot allocate memory" * 6192: Numeric column stores wrong values after adding large numbers * 6193: converting to a smaller precision (fewer or no decimals after decimal point) should round/truncate consistently * 6194: splitpart returns truncated last part if it contains non ascii caracters * 6195: Cast from huge decimal type to smaller returns wrong results * 6196: Database crashes after generate_series query * 6198: COALESCE could be more optimized * 6201: MonetDB completely giving up on certain queries - no error and no result * 6202: querying a table with an ordered index on string/varchar column crashes server and makes server unrestartable! * 6203: copy into: Failed to import table Leftover data 'False' * 6205: Integer addition overflow * 6206: casting strings with more than one trailing zero ('0') to decimal goes wrong * 6209: Aggregation over complex OR expressions produce wrong results * 6210: Upgrading a database from Jun2015 or older crashes the server * 6213: SQLsmith causes server to crash * 6217: Segfault in rel_optimizer (sqlsmith) * 6218: grouped quantiles with all null group causes following groups to return null * 6224: mal_parser: cannot refer to types containing an underscore

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WARNING for users of the default branch
by Sjoerd Mullender 02 Mar '17

02 Mar '17

Databases created with the default branch before changeset f054b7310be7 (Mar 1, 2017) are *not* compatible with the default branch from that changeset on. The changeset is a merge of fixes from the Dec2016 branch, and one of the fixes introduced a version number update of the BBP.dir file. This update was incompatible with an earlier update of the version number that was exclusive to the default branch. There are two possible solutions: - dump your database(s) with a version from before the chnangeset, and restore with a version after. - manually update the version number in the BBP.dir file and ignore the possibility that the bug that was fixed may be in your database. Manually fixing the BBP.dir file involves incrementing the number on the first line of the file from 25118 to 25119. Needless to say, this is not recommended. Remember, there are no guarantees when using the default branch. In fact, there are also no guarantees when using any other branch. The only thing we promise is that we will do our best to make sure the actual releases work and can be upgraded properly. -- Sjoerd Mullender

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monetdb.org system maintenance
by Sjoerd Mullender 01 Mar '17

01 Mar '17

Tomorrow, March 2, we will be upgrading the hardware for the system on which all monetdb.org infrastructure runs. Expect some downtime. -- Sjoerd Mullender

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