185 lines
9.6 KiB
HTML
185 lines
9.6 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>SQLite Release 3.21.0 On 2017-10-24</title>
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<!-- path=../ -->
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0">
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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<li><a href="../index.html">Home</a>
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<li><a href='../about.html'>About</a>
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<li><a href='../docs.html'>Documentation</a>
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<li><a href='../download.html'>Download</a>
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<li><a href='../support.html'>Support</a>
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<li><a href='../prosupport.html'>Purchase</a>
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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</div>
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<h2>SQLite Release 3.21.0 On 2017-10-24</h2><p><ol class='lessindent'>
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<li> Take advantage of the atomic-write capabilities in the
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<a href="https://en.wikipedia.org/wiki/F2FS">F2FS filesystem</a> when available, for
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greatly reduced transaction overhead. This currently requires the
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<a href="../compile.html#enable_batch_atomic_write">SQLITE_ENABLE_BATCH_ATOMIC_WRITE</a> compile-time option.
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<li> Allow <a href="../lang_attach.html">ATTACH</a> and <a href="../lang_detach.html">DETACH</a> commands to work inside of a transaction.
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<li> Allow <a href="../vtab.html#worid">WITHOUT ROWID virtual tables</a> to be writable if the PRIMARY KEY
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contains exactly one column.
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<li> The "fsync()" that occurs after the header is written in a WAL reset
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now uses the sync settings for checkpoints. This means it will use a
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"fullfsync" on macs if <a href="../pragma.html#pragma_checkpoint_fullfsync">PRAGMA checkpoint_fullfsync</a> set on.
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<li> The <a href="../c3ref/libversion.html">sqlite3_sourceid()</a> function tries to detect if the source code has
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been modified from what is checked into version control and if there are
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modifications, the last four characters of the version hash are shown as
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"alt1" or "alt2". The objective is to detect accidental and/or careless
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edits. A forger can subvert this feature.
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<li> Improved de-quoting of column names for <a href="../lang_createtable.html#createtabas">CREATE TABLE AS</a> statements with
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an aggregate query on the right-hand side.
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<li> Fewer "stat()" system calls issued by the unix VFS.
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<li> Enhanced the <a href="../optoverview.html#like_opt">LIKE optimization</a> so that it works with an <a href="../lang_expr.html#like">ESCAPE</a> clause.
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<li> Enhanced <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> and <a href="../pragma.html#pragma_quick_check">PRAGMA quick_check</a> to detect obscure
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row corruption that they were formerly missing. Also update both pragmas
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so that they return error text rather than SQLITE_CORRUPT when encountering
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corruption in <a href="../fileformat2.html#record_format">records</a>.
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<li> The query planner now prefers to implement FROM-clause subqueries using
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<a href="../optoverview.html#coroutines">co-routines</a> rather using the <a href="../optoverview.html#flattening">query flattener</a> optimization. Support for
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the use of co-routines for subqueries may no longer be disabled.
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<li> Pass information about !=, IS, IS NOT, NOT NULL, and IS NULL constraints
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into the <a href="../vtab.html#xbestindex">xBestIndex</a> method of virtual tables.
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<li> Enhanced the <a href="../csv.html">CSV virtual table</a> so that it accepts the last row of
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input if the final new-line character is missing.
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<li> Remove the rarely-used "scratch" memory allocator. Replace it with the
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<a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigsmallmalloc">SQLITE_CONFIG_SMALL_MALLOC</a> configuration setting that gives SQLite
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a hint that large memory allocations should be avoided when possible.
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<li> Added the
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<a href="https://sqlite.org/src/file/ext/misc/unionvtab.c">swarm virtual table</a>
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to the existing union virtual table extension.
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<li> Added the
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<a href="https://sqlite.org/src/file/src/dbpage.c">sqlite_dbpage virtual table</a>
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for providing direct access to pages
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of the database file. The source code is built into the <a href="../amalgamation.html">amalgamation</a> and
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is activated using the <a href="../compile.html#enable_dbpage_vtab">-DSQLITE_ENABLE_DBPAGE_VTAB</a> compile-time option.
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<li> Add a new type of fts5vocab virtual table - "instance" - that provides
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direct access to an FTS5 full-text index at the lowest possible level.
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<li> Remove a call to rand_s() in the Windows VFS since it was causing problems
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in Firefox on some older laptops.
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<li> The <a href="https://sqlite.org/src/finfo?name=src/shell.c">src/shell.c</a> source code
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to the <a href="../cli.html">command-line shell</a> is no longer under version control. That file
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is now generated as part of the build process.
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<li> Miscellaneous <a href="../cpu.html#microopt">microoptimizations</a> reduce CPU usage by about 2.1%.
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<li> Bug fixes:
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<ol type="a">
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<li> Fix a faulty assert() statement discovered by OSSFuzz.
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Ticket <a href="https://sqlite.org/src/info/cb91bf4290c211d">cb91bf4290c211d</a>
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<li> Fix an obscure memory leak in <a href="../c3ref/result_blob.html">sqlite3_result_pointer()</a>.
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Ticket <a href="https://sqlite.org/src/info/7486aa54b968e9b">7486aa54b968e9b</a>
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<li> Avoid a possible use-after-free error by deferring schema resets until
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after the query planner has finished running.
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Ticket <a href="https://sqlite.org/src/info/be436a7f4587ce5">be436a7f4587ce5</a>
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<li> Only use indexes-on-expressions to optimize ORDER BY or GROUP BY if
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the COLLATE is correct.
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Ticket <a href="https://sqlite.org/src/info/e20dd54ab0e4383">e20dd54ab0e4383</a>
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<li> Fix an assertion fault that was coming up when the expression in an
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index-on-expressions is really a constant.
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Ticket <a href="https://sqlite.org/src/info/aa98619ad08ddca">aa98619ad08ddca</a>
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<li> Fix an assertion fault that could occur following
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<a href="../pragma.html#pragma_reverse_unordered_selects">PRAGMA reverse_unordered_selects</a>.
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Ticket <a href="https://sqlite.org/src/info/cb91bf4290c211d">cb91bf4290c211d</a>
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<li> Fix a segfault that can occur for queries that use table-valued functions
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in an IN or EXISTS subquery.
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Ticket <a href="https://sqlite.org/src/info/b899b6042f97f5">b899b6042f97f5</a>
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<li> Fix a potential integer overflow problem when compiling a particular
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horrendous common table expression. This was another problem discovered
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by OSSFuzz. Check-in <a href="https://sqlite.org/src/info/6ee8cb6ae5">6ee8cb6ae5</a>.
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<li> Fix a potential out-of-bound read when querying a corrupt database file,
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a problem detected by Natalie Silvanovich of Google Project Zero.
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Check-in <a href="https://sqlite.org/src/info/04925dee41a21f">04925dee41a21f</a>.
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</ol>
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<p><b>Hashes:</b>
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<li>SQLITE_SOURCE_ID: "2017-10-24 18:55:49 1a584e499906b5c87ec7d43d4abce641fdf017c42125b083109bc77c4de48827"
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<li>SHA3-256 for sqlite3.c: 84c181c0283d0320f488357fc8aab51898370c157601459ebee49d779036fe03
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</ol></p>
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<p>A <a href="../changes.html">complete list of SQLite releases</a>
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in a single page and a <a href="../chronology.html">chronology</a> are both also available.
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A detailed history of every
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check-in is available at
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<a href="http://www.sqlite.org/src/timeline">
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SQLite version control site</a>.</p>
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