Revision history for Perl extension Genezzo

0.20  Wed Jul 28 23:20:33 2004
        - Dict changes:
           use _get_col_hash to replace hard-coded column indexes in
           Dict, Tablespace.
        - bt2 - support for non-unique indexes where rid is part of key.
        ALTER TABLE ADD CONSTRAINT support

0.19  Thu Jul 22 10:40:15 2004
        - Gnzo2.t: uncovered issue where RSFile might return 
          incorrect rid's during push -- a very serious problem
          for chained rows.  Fixes to RSFile::_get_current_chunk
        - Dict changes: 
            add ind1, ind1_cols tables for index information
            add primary key for cons1_cols, _tsfiles, ind1, ind1_cols
            dump "help" option
        - fix fetch from empty index

0.18  Mon Jul 12 22:36:04 2004
        - extensible datafiles via increase_by
        - add "increase_by" to AddFile command.  Support fixed size (bytes) 
          increase or percentage increase.  
        - Dict changes:  
            _tspace  - addfile column
            _tsfiles - increase_by column
        - add "bigdb.sql" script to reset database to acquire multiple, 
          auto-extending datafiles
        - fix month in iso-8601 dates
        - insert select: check if table exists first
        - add SHOW command with version, license
        - convert to GPL

0.17  Sat Jul  3 15:18:54 2004
        - Gnzo2.t: fixes for long row splitting and updating.  Make sure
          to write row status bit changes (versus just updating in memory).
          Always insert the new row pieces first so if run out of
          space, the original row value is preserved.

0.16  Thu Jul  1 14:48:44 2004
        - IdxTab filter fixes
        - btHash Index fetch (fetching from index as a "table") 
          filter fixes.
        - Dict changes: 
            core table "creationdate" columns in iso-8601 format
            (YYYY-MM-DDtHH:MI:SS) because numeric date "epoch" 
            not portable.
            _tab1    - otype to object_type, 
            _tsfiles - add initial_size, calc_increase
        - pass filename, size arguments for AddFile
        - datafile portability: only store relative paths for file names
          in _tsfiles so can move gnz_home directory
        - default increase_by=50% for extent allocation
        - Extensible datafiles via increase_by (in progress)
        - Gnzo2.t: fixes for long row splitting and updating (still broken)

0.15  Mon Jun 21 21:32:43 2004
        - Create Index <index_name> on <table_name> (col1 [,...<col_n>])
        - Use primary key index lookup for equality predicates 
          (WHERE index_col = "literal")
        - INDEX object type
        - core table "creationdate" column as number (not char)
        - estimation for rsidx/bthash - (placeholder - just straight count)
        - fixes for primary key constraints
        - Internal: bt2 - fix SQLFetch to match RSTab api
                    Dict - define and load primary key indexes in 2 phases
        - fix "select count(*) from ggg" when ggg is an idxtab

0.14  Thu Jun 17 19:47:13 2004
        - btree support for unique key (duplicate detection)
          on insert, added key_type argument to simplify btree
          api, start_key/stop_key support in index SQLPrepare,
          IOT's with multiple value columns, WHERE clause support
          for startkey/stopkey for (=, <, >) operations.
        - Handle "nearest" start/stopkey, versus an exact match.
        - Internal: start transitioning to object_id vs tablename
          in dictionary, space mgmt, row sources
        - primary key constraints for dictionary tables
        - primary key index support

0.13  Fri Jun  4 02:24:31 2004
        - index enhancement to support multicolumn keys,
          index persistent space management, 
          fix rowcount on insert failure, index count support,
          index-only table support via "ct <tabname> index <col=value>...", 
          limited WHERE clause support for equality keys

0.12  Fri May 21 01:40:43 2004
        - change packrow - don't need separate len for null bitvec,
          parameterize numeric pack types to support BER ints.  
          Add -define parameter to pass key=value pairs for db
          initialization (e.g. blocksize=2k).  
          Fix rowcount in DBI fetch (GenDBI::SelectFetch).
          Cleanup Tablespace handling of filearr,used/unused to match
          Dict _tsfiles fileidx.
          Use Util::UNPACK_TEMPL_ARR to cache common unpacking templates
          to speed up UnPackRow.
          bt2: faster insertion

0.11  Tue Mar 30 23:14:54 2004
        - change col1 and pref1 column names so not reserved words,
          fix bufcache creation to get size from prefs, use all free 
          blocks before checking pin status, parse IS [NOT] NULL 
          predicates

0.10  Fri Mar 19 23:59:46 2004
        - describe table, better string parsing of relop tokens 
          (e.g. =, <, > ...), primitive sql update (basically single
          row update column=value, no subqueries), slight fixes on
          RSFile/SMFile nextblock improve row packing density, remove
          surrounding quotes on insert/update values, return undef's in 
          SelectFetch (versus the string "<undef>"), quiet undef warnings
          for WHERE filters, simple sql create/drop table, deprecate use
          of pack Z template in fileheader to stay compatible with
          perl 5.6.  

0.09  Tue Mar  9 20:59:04 2004
        - metadata support functions, DBI-style interfaces, 
          column aliases, basic WHERE clause support, sql DELETE,
          dbi_example.pl script
        - insert select, additional fileheader fields and checksum,
          fixes for RSTab row splitting, HCount/ECount fetch

0.08  Tue Feb 10 08:11:20 2004 
        - row chaining/splitting, block labelling and checksums, 
          count estimation, variable fileheader with versioning, 
          HSuck, multiple file support via AddFile

0.07  Sun Nov 02 07:28:33 2003
        - null handling in blocks, improve parser

0.06  Sat Oct 18 07:53:53 2003
        - remove SQL::Statement dependency - use Feeble parser, 
          btree index prototyping, block (vs row) interface: make_new_block

0.05  Wed Oct 01 07:42:33 2003
        - Dictionary restructure for true tids vs rids

0.04  Tue Sep  2 21:28:29 2003
        - more comments, testing, configuration, automatic install,
          single file database with self-describing dictionary

0.03  Experimental
0.02  Experimental

0.01  Wed Mar 26 11:52:41 2003
	- original version; created by h2xs 1.20 with options
		-X Genezzo

