changelog.html

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Change Log
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<h1>Change Log</h1>

<h2>Next Version (unreleased)</h2>
<ul><li>To compile user defined functions, the javax.tools.JavaCompiler is now used if available,
    and no temporary files are created. 
    This should solve problems when multiple H2 database concurrently compile 
    the same user defined functions.
</li><li>Concurrently creating function aliases in different databases
    could result in the exception "javac: file not found".
</li><li>The function "regexp_replace" threw the wrong kind of exception if the
    replacement string was invalid.
</li><li>A checkpoint is now done every MAX_LOG_SIZE / 2 instead of every
    MAX_LOG_SIZE, so that the transaction log doesn't grow as large.
</li><li>MVStore table engine: new setting "retention_time" to configure the
    time to retain old data. The default is 45 seconds.
</li><li>The method TableEngine.createTable() now returns a Table object.
</li><li>For read-only databases, for the trace level "debug",
    the trace info is written to the temp directory.
</li><li>Closing the file lock will now wait until the background thread is stopped.
</li><li>In version 1.3.172, a performance regression was introduced when
    fixing the issue 389 (when there is a multi-column primary key,
    H2 does not seem to always pick the right index). This was related to
    boosting an index that matches the "order by" column list
    (the wrong index was used in some cases).
</li><li>Improved spatial index and data type.
</li><li>Issue 467: OSGi Class Loader (ability to create reference to class
    in other ClassLoader, for example in another OSGi bundle).
</li><li>Queries "group by" that contain a subquery with an aggregate function
    returned the wrong result in some cases.
</li><li>Fix bug in unique and non-unique hash indexes which manifested as incorrect results
    when the search key was a different cardinal type from the table index key.
    e.g. where the one was INT and the other was LONG
</li><li>Bug: Changes to the database structure did not result
    in the Session query cache being invalidated.
</li><li>New feature from Davide Cavestro - allow using custom Java object serialization
    engines on a per-DB basis.
</li><li>When running the Recover tool on very large (>6G) databases, some statistics were reported with
    negative numbers.
</li><li>Add a CONTAINS_UNCOMMITTED column to the SESSIONS metadata table, to allow detecting when rogue
    sessions are creating large transactions.
</li><li>Some small fixes to the GEOMETRY support, patches by Nicolas Fortin.
</li><li>The BNF tool and the autocomplete feature are exported in OSGi,
    which makes it possible for smart editors to do autocomplete. Patch from Nicolas Fortin.
</li><li>Fix DROP ALL OBJECTS and DROP SCHEMA in the presence of tables with computed column dependencies.
</li><li>Session-temporary LOB's could sometimes accumulate, increasing the size of the DB file until shutdown.
    Now they are cleared out at every commit.
</li><li>There was a bug where a hash index with more than one column would be silently converted to a regular index.
    It will now throw an exception.
</li><li>Query Statistics: new feature which stores the newest 100 SQL queries executed and their performance data.
    Useful for tracking down badly performing queries.
</li><li>Fix an LOB deadlock between reading and updating LOB columns.
</li></ul>

<h2>Version 1.3.173 (2013-07-28)</h2>
<ul><li>Support empty statements that just contains a comment.
</li><li>Server mode: if there was an error while reading from a LOB, the session was closed in some cases.
</li><li>Issue 463: Driver name and version are now the same in OsgiDataSourceFactory and JdbcDatabaseMetaData.
</li><li>JaQu: The data type VARCHAR is now (again) used for Strings
    (no longer TEXT, except when explicitly set).
</li><li>For in-memory databases, creating an index on a CLOB or BLOB column
    is no longer supported. This is to simplify the MVTableEngine.
</li><li>New column "information_schema.tables.row_count_estimate".
</li><li>Issue 468: trunc(timestamp) could return the wrong value (+12 hours), and trunc(number) throw a NullPointerException.
</li><li>The expression trunc(number) threw a NullPointerException.
</li><li>Fixed a deadlock when updating LOB's concurrently. See TestLob.testDeadlock2().
</li><li>Fixed a deadlock related to very large temporary result sets.
</li><li>Add "-list" command line option to Shell tool so that result-list-mode can be triggered when reading from a file.
</li><li>Issue 474: H2 MySQL Compatibility code fails to ignore "COMMENT" in CREATE TABLE, patch from Aaron Azeckoski.
</li><li>Issue 476: Broken link in jaqu.html
</li><li>Fix potential UTF8 encoding issue in org.h2.store.FileStore, reported by Juerg Spiess.
</li><li>Improve error message when check constraint is broken, test case from Gili (cowwoc).
</li><li>Improve error message when we have a unique constraint violation, displays the offending key in the error message.
</li><li>Issue 478: Support for "SHOW TRANSACTION ISOLATION LEVEL", patch from Andrew Franklin.
</li><li>Issue 475: PgServer: add support for CancelRequest, patch from Andrew Franklin.
</li><li>Issue 473: PgServer missing -key option, patch from Andrew Franklin.
</li><li>Issue 471: CREATE VIEW does not check user rights, patch from Andrew Franklin.
</li><li>Issue 477: PgServer binary transmission of query params is unimplemented, patch from Andrew Franklin.
</li><li>Issue 479: Support for SUBSTRING without a FROM condition, patch from Andrew Franklin.
</li><li>Issue 472: PgServer does not work with any recent Postgres JDBC driver, patch from Andrew Franklin.
</li><li>Add syntax for passing additional parameters into custom TableEngine implementations.
</li><li>Issue 480: Bugfix post issue 475, 477, patch from Andrew Franklin.
</li><li>Issue 481: Further extensions to PgServer to support better support PG JDBC, patch from Andrew Franklin.
</li><li>Add support for spatial datatype GEOMETRY.
</li><li>Add support for in-memory spatial index.
</li><li>change the PageStore#changeCount field from an int to a long,
    to cope with databases with very high transaction rates.
</li><li>Fix a NullPointerException when attempting to add foreign key reference to a view.
</li><li>Add sufficient ClientInfo support to our javax.sql.Connection implementation to make WebSphere happy.
</li><li>Issue 482: class LobStorageBackend$LobInputStream does not override the method InputStream.available().
</li><li>Fix corruption resulting from a mix of the "WRITE_DELAY=0" option
    and "SELECT DISTINCT" queries that don't fit in memory.
</li><li>Fix the combination of updating a table which contains an LOB,
    and reading from the LOB at the same time.
    Previously it would throw an exception, now it works.
</li><li>Issue 484: In the H2 Console tool, all schemas starting with "INFO" where hidden.
    Now they are hidden only if the database is not H2. Patch from "mgcodeact"/"cumer d"
</li><li>MySQL compatibility, support the "AUTO_INCREMENT=3" part of the CREATE TABLE statement.
</li><li>Issue 486: MySQL compatibility, support the "DEFAULT CHARSET" part of the CREATE TABLE statement.
</li><li>Issue 487: support the MySQL "SET foreign_key_checks = 0" command
</li><li>Issue 490: support MySQL "USING BTREE" index declaration
</li><li>Issue 485: Database get corrupted when column is renamed for which check constraint was defined inside create table statement.
</li><li>Issue 499: support MySQL "UNIQUE KEY (ID) USING BTREE" constraint syntax
</li><li>Issue 501: "CREATE TABLE .. WITH" not serialized, patch from nico.devel
</li><li>Avoid problems with runtime-compiled ALIAS methods when people have set the JAVA_TOOL_OPTIONS environment variable.
</li></ul>

<h2>Version 1.3.172 (2013-05-25)</h2>
<ul><li>Referential integrity: when adding a referential integrity constraint failed,
    and if creating the constraint automatically created an index, this index was not removed.
</li><li>The auto-analyze feature now only reads 1000 rows per table instead of 10000.
</li><li>The optimization for IN(...) queries combined with OR could result
    in a strange exception of the type "column x must be included in the group by list".
</li><li>Issue 454: Use Charset for type-safety.
</li><li>Queries with both LIMIT and OFFSET could throw an IllegalArgumentException.
</li><li>MVStore: multiple issues were fixed: 460, 461, 462, 464, 466.
</li><li>MVStore: larger stores (multiple GB) are now much faster.
</li><li>When using local temporary tables and not dropping them manually before closing the session,
    and then killing the process could result in a database that couldn't be opened (except when using
    the recover tool).
</li><li>Support TRUNC(timestamp) for improved Oracle compatibility.
</li><li>Add support for CREATE TABLE TEST (ID BIGSERIAL) for PostgreSQL compatibility. Patch from Jesse Long.
</li><li>Add new collation command SET BINARY_COLLATION UNSIGNED, helps with people testing BINARY columns in MySQL mode.
</li><li>Issue 453: ABBA race conditions in TABLE LINK connection sharing.
</li><li>Issue 449: Postgres Serial data type should not automatically be marked as primary key
</li><li>Issue 406: Support "select h2version()"
</li><li>Issue 389: When there is a multi-column primary key, H2 does not seem to always pick the right index
</li><li>Issue 305: Implement SELECT ... FOR FETCH ONLY
</li><li>Issue 274: Sybase/MSSQLServer compatibility - Add GETDATE and CHARINDEX system functions
</li><li>Issue 274: Sybase/MSSQLServer compatibility - swap parameters of CONVERT function.
</li><li>Issue 274: Sybase/MSSQLServer compatibility - support index clause e.g. "select * from test (index table1_index)"
</li><li>Fix bug in Optimizing SELECT * FROM A WHERE X=1 OR X=2 OR X=3 into SELECT * FROM A WHERE X IN (1,2,3)
</li><li>Issue 442: Groovy patch for SourceCompiler (function ALIAS)
</li><li>Issue 459: Improve LOB documentation
</li></ul>

<h2>Version 1.3.171 (2013-03-17)</h2>
<ul><li>Security: the TCP server did not correctly restrict access rights of clients in some cases.
    This was specially a problem when using the flag "tcpAllowOthers".
</li><li>H2 Console: the session timeout can now be configured using the system property "h2.consoleTimeout".
</li><li>Issue 431: Improved compatibility with MySQL: support for
    "ENGINE=InnoDB charset=UTF8" when creating a table.
</li><li>Issue 249: Improved compatibility with MySQL in the MySQL mode:
    now the methods DatabaseMetaData methods stores*Case*Identifiers return the same as MySQL
    when using the MySQL mode.
</li><li>Issue 434: H2 Console didn't work in the Chrome browser
    due to a wrong viewport argument.
</li><li>There was a possibility that the .lock.db file was not deleted
    when the database was closed, which could slow down opening the database.
</li><li>The SQL script generated by the "script" command contained
    inconsistent newlines on Windows.
</li><li>When using trace level 4 (SLF4J) in the server mode, a directory "trace.db"
    and an empty file was created on the client side. This is no longer made.
</li><li>Optimize IN(...) queries: there was a bug in version 1.3.170
    if the type of the left hand side didn't match the type of the right hand side. Fixed.
</li><li>Optimize IN(...) queries: there was a bug in version 1.3.170 for comparison of the type
    "X IN(NULL, NULL)". Fixed.
</li><li>Timestamps with timezone that were passed as a string were not always
    converted correctly. For example "2012-11-06T23:00:00.000Z" was converted to
    "2012-11-06" instead of to "2012-11-07" in the timezone CET.
    Thanks a lot to Steve Hruda for reporting the problem!
</li><li>New table engine "org.h2.mvstore.db.MVTableEngine"
    that internally uses the MVStore to persist data.
    To try it out, append ";DEFAULT_TABLE_ENGINE=org.h2.mvstore.db.MVTableEngine"
    to the database URL.
    This is still very experimental, and many features are not supported yet.
    The data is stored in a file with the suffix ".mv.db".
</li><li>New connection setting "DEFAULT_TABLE_ENGINE" to use a specific
    table engine if none is set explicitly. This is to simplify testing
    the MVStore table engine.
</li><li>MVStore: encrypted stores are now supported.
    Only standardized algorithms are used: PBKDF2, SHA-256, XTS-AES, AES-128.
</li><li>MVStore: improved API thanks to Simo Tripodi.
</li><li>MVStore: maps can now be renamed.
</li><li>MVStore: store the file header also at the end of each chunk,
    which results in a further reduced number of write operations.
</li><li>MVStore: a map implementation that supports concurrent operations.
</li><li>MVStore: unified exception handling; the version is included in the messages.
</li><li>MVStore: old data is now retained for 45 seconds by default.
</li><li>MVStore: compress is now disabled by default, and can be enabled on request.
</li><li>Support ALTER TABLE ADD ... AFTER. Patch from Andrew Gaul (argaul at gmail.com). Fixes issue 401.
</li><li>Improved OSGi support. H2 now registers itself as a DataSourceFactory service. Fixes issue 365.
</li><li>Add a DISK_SPACE_USED system function. Fixes issue 270.
</li><li>Fix a compile-time ambiguity when compiling with JDK7, thanks to a patch from Lukas Eder.
</li><li>Supporting dropping an index for Lucene full-text indexes.
</li><li>Optimized performance for SELECT ... ORDER BY X LIMIT Y OFFSET Z
    queries for in-memory databases using partial sort (by Sergi Vladykin).
</li><li>Experimental off-heap memory storage engine "nioMemFS:" and "nioMemLZF:",
    suggestion from Mark Addleman.
</li><li>Issue 438: JdbcDatabaseMetaData.getSchemas() is no longer supported as of 1.3.169.
</li><li>MySQL compatibility: support for ALTER TABLE tableName MODIFY [COLUMN] columnName columnDef. Patch from Ville Koskela.
</li><li>Issue 404: SHOW COLUMNS FROM tableName does not work with ALLOW_LITERALS=NUMBERS.
</li><li>Throw an explicit error to make it clear we don't support the TRIGGER combination of SELECT and FOR EACH ROW.
</li><li>Issue 439: Utils.sortTopN does not handle single-element arrays.
</li></ul>

<h2>Version 1.3.170 (2012-11-30)</h2>
<ul><li>Issue 407: The TriggerAdapter didn't work with CLOB and BLOB columns.
</li><li>PostgreSQL compatibility: support for data types BIGSERIAL and SERIAL
    as an alias for AUTO_INCREMENT.
</li><li>Issue 417: H2 Console: the web session timeout didn't work, resulting in a memory leak.
    This was only a problem if the H2 Console was run for a long time and many sessions were opened.
</li><li>Issue 412: Running the Server tool with just the option "-browser" will now log a warning.
</li><li>Issue 411: CloseWatcher registration was not concurrency-safe.
</li><li>MySQL compatibility: support for CONCAT_WS.
    Thanks a lot to litailang for the patch!
</li><li>PostgreSQL compatibility: support for EXTRACT(WEEK FROM dateColumn).
    Thanks to Prashant Bhat for the patch!
</li><li>Fix for a bug where we would sometimes use the wrong unique constraint to validate foreign key constraints.
</li><li>Support BOM at the beginning of files for the RUNSCRIPT command
</li><li>Fix in calling SET @X = IDENTITY() where it would return NULL incorrectly
</li><li>Fix ABBA deadlock between adding a constraint and the H2-Log-Writer thread.
</li><li>Optimize IN(...) queries where the values are constant and of the same type.
</li><li>Restore tool: the parameter "quiet" was not used and is now removed.
</li><li>Fix ConcurrentModificationException when creating tables and executing SHOW TABLES in parallel. Reported by Viktor Voytovych.
</li><li>Serialization is now pluggable using the system property "h2.javaObjectSerializer". Thanks to Sergi Vladykin for the patch!
</li></ul>

<h2>Version 1.3.169 (2012-09-09)</h2>
<ul><li>The default jar file is now compiled for Java 6.
</li><li>The new jar file will probably not end up in the central Maven repository
    in the next few weeks because Sonatype has disabled automatic synchronization
    from SourceForge (which they call 'legacy sync' now).
    It will probably take some time until this is sorted out. The H2 jar files are deployed to
    http://h2database.com/m2-repo/com/h2database/h2/maven-metadata.xml
    and http://hsql.sourceforge.net/m2-repo/com/h2database/h2/maven-metadata.xml
    as usual.
</li><li>A part of the documentation and the H2 Console has been changed to support the Apple retina display.
</li><li>The CreateCluster tool could not be used if the source database contained a CLOB or BLOB.
    The root cause was that the TCP server did not synchronize on the session, which caused a problem
    when using the exclusive mode.
</li><li>Statement.getQueryTimeout(): only the first call to this method will query the database.
    If the query timeout was changed in another way than calling setQueryTimeout,
    this method will always return the last value. This was changed because Hibernate
    calls getQueryTimeout() a lot.
</li><li>Issue 416: PreparedStatement.setNString throws AbstractMethodError.
    All implemented JDBC 4 methods that don't break compatibility with Java 5
    are now included in the default jar file.
</li><li>Issue 414: for some functions, the parameters were evaluated twice
    (for example "char(nextval(..))" ran "nextval(..)" twice).
</li><li>The ResultSetMetaData methods getSchemaName and getTableName
    could return null instead of "" (an empty string) as specified in the JDBC API.
</li><li>Added compatibility for "SET NAMES" query in MySQL compatibility mode.</li>
</ul>

<h2>Version 1.3.168 (2012-07-13)</h2>
<ul><li>The message "Transaction log could not be truncated" was sometimes written
    to the .trace.db file even if there was no problem truncating the transaction log.
</li><li>New system property "h2.serializeJavaObject" (default: true) that allows to disable
    serializing Java objects, so that the objects compareTo and toString methods can be used.
</li><li>Dylan has translated the H2 Console tool to Korean. Thanks a lot!
</li><li>Executing the statement CREATE INDEX IF ALREADY EXISTS if the index already exists
    no longer fails for a read only database.
</li><li>MVCC: concurrently updating a row could result in the row to appear deleted in the second connection,
    if there are multiple unique indexes (or a primary key and at least one unique index).
    Thanks a lot to Teruo for the patch!
</li><li>Fulltext search: in-memory Lucene indexes are now supported.
</li><li>Fulltext search: UUID primary keys are now supported.
</li><li>Apache Tomcat 7.x will now longer log a warning when unloading the web application, if using a connection pool.
</li><li>H2 Console: support the Midori browser (for Debian / Raspberry Pi)
</li><li>When opening a remote session, don't open a temporary file if the trace level is set to zero
</li><li>Use HMAC for authenticating remote LOB id's, removing the need for maintaining a cache, and removing the limit
    on the number of LOBs per result set.
</li><li>H2 Console: HTML and XML documents can now be edited in an updatable result set.
    There is (limited) support for editing multi-line documents.
</li></ul>

<h2>Version 1.3.167 (2012-05-23)</h2>
<ul><li>H2 Console: when editing a row, an empty varchar column was replaced with a single space.
</li><li>Lukas Eder has updated the jOOQ documentation.
</li><li>Some nested joins could not be executed, for example:
    select * from (select * from (select * from a) a right join b b) c;
</li><li>MS SQL Server compatibility: ISNULL is now an alias for IFNULL.
</li><li>Terrence Huang has completed the translation of the H2 Console tool to Chinese. Thanks a lot!
</li><li>Server mode: the number of CLOB / BLOB values that were cached on the server
    is now the maximum of: 5 times the SERVER_RESULT_SET_FETCH_SIZE (which is 100 by default),
    and SysProperties.SERVER_CACHED_OBJECTS.
</li><li>In the trace file, the query execution time was incorrect in some cases, specially
    for the statement SET TRACE_LEVEL_FILE 2.
</li><li>The feature LOG_SIZE_LIMIT that was introduced in version 1.3.165 did not always work
    correctly (specially with regards to multithreading) and has been removed.
    The message "Transaction log could not be truncated" is still written to the .trace.db file
    if required.
</li><li>Then reading from a resource using the prefix "classpath:", the ContextClassLoader
    is now used if the resource can't be read otherwise.
</li><li>DatabaseEventListener now calls setProgress whenever a statement starts and ends.
</li><li>DatabaseEventListener now calls setProgress periodically while a statement is running.
</li><li>The table INFORMATION_SCHEMA.FUNCTION_ALIASES now includes a column TYPE_NAME.
</li><li>Issue 378: when using views, the wrong values were bound to a parameter in some cases.
</li><li>Terrence Huang has translated the error messages to Chinese. Thanks a lot!
</li><li>TRUNC was added as an alias for TRUNCATE.
</li><li>Small optimisation for accessing result values by column name.
</li><li>Fix for bug in Statement.getMoreResults(int)
</li><li>The SCRIPT statements now supports filtering by schema and table. Thanks a lot to Jacob Qvortrup for providing the patch!
</li></ul>

<h2>Version 1.3.166 (2012-04-08)</h2>
<ul><li>Indexes on column that are larger than half the page size (wide indexes)
    could sometimes get corrupt, resulting in an ArrayIndexOutOfBoundsException in PageBtree.getRow
    or "Row not found" in PageBtreeLeaf. Also, such indexes used too much disk space.
</li><li>Server mode: when retrieving more than 64 rows each containing a CLOB or BLOB,
    the error message "The object is already closed" was thrown.
</li><li>ConvertTraceFile: the time in the trace file is now parsed as a long.
</li><li>Invalid connection settings are now detected.
</li><li>Issue 387: WHERE condition getting pushed into sub-query with LIMIT.
</li></ul>

<h2>Version 1.3.165 (2012-03-18)</h2>
<ul><li>Better string representation for decimal values (for example 0.00000000 instead of 0E-26).
</li><li>Prepared statements could only be re-used if the same data types were used
    the second time they were executed.
</li><li>In error messages about referential constraint violation, the values are now included.
</li><li>SCRIPT and RUNSCRIPT: the password can now be set using a prepared statement.
    Previously, it was required to be a literal in the SQL statement.
</li><li>MySQL compatibility: SUBSTR with a negative start index now works like MySQL.
</li><li>When enabling autocommit, the transaction is now committed (as required by the JDBC API).
</li><li>The shell script <code>h2.sh</code> did not work with spaces in the path.
    It also works now with quoted spaces in the argument list.
    Thanks a lot to Shimizu Fumiyuki for the patch!
</li><li>If the transaction log could not be truncated because of an uncommitted transaction,
    now "Transaction log could not be truncated" is written to the .trace.db file.
    Before, the database file was growing and it was hard to find out what the root cause was.
    To avoid the database file from growing, a new feature to automatically rollback the oldest
    transaction is available now. To enable it, append ;LOG_SIZE_LIMIT=32 to the database URL
    (in that case, the oldest session is rolled back if the transaction log is 32 MB).
</li><li>ALTER TABLE ADD can now add more than one column at a time.
</li><li>Issue 380: ALTER TABLE ADD FOREIGN KEY with an explicit index didn't verify
    the index can be used, which would lead to a NullPointerException later on.
</li><li>Issue 384: the wrong kind of exception (NullPointerException) was thrown in a UNION query
    with an incorrect ORDER BY expression.
</li><li>Issue 362: support LIMIT in UPDATE statements.
</li><li>Browser: if no default browser is set, Google Chrome is now used if available.
    If not available, then Konqueror, Netscape, or Opera is used if available (as before).
</li><li>CSV tool: new feature to disable writing the column header
    (option writeColumnHeader).
</li><li>CSV tool: new feature to preserve the case sensitivity of column names
    (option caseSensitiveColumnNames).
</li><li>PostgreSQL compatibility: LOG(x) is base 10 in the PostgreSQL mode.
</li></ul>

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