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<title>SQLite Release 3.28.0 On 2019-04-16</title>
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<h2>SQLite Release 3.28.0 On 2019-04-16</h2><p><ol class='lessindent'>
<li> Enhanced <a href="../windowfunctions.html">window functions</a>:
<ol type="a">
<li> Add support the <a href="../windowfunctions.html#wexcls">EXCLUDE clause</a>.
<li> Add support for <a href="../windowfunctions.html#wchaining">window chaining</a>.
<li> Add support for <a href="../windowfunctions.html#grouptype">GROUPS frames</a>.
<li> Add support for "<a href="../windowfunctions.html#exprrange"><expr> PRECEDING</a>" and
"<a href="../windowfunctions.html#exprrange"><expr> FOLLOWING</a>" boundaries
in RANGE <a href="../windowfunctions.html#framespec">frames</a>.
</ol>
<li> Added the new <a href="../c3ref/stmt_isexplain.html">sqlite3_stmt_isexplain(S)</a> interface for determining
whether or not a <a href="../c3ref/stmt.html">prepared statement</a> is an <a href="../lang_explain.html">EXPLAIN</a>.
<li> Enhanced <a href="../lang_vacuum.html#vacuuminto">VACUUM INTO</a> so that it works for read-only databases.
<li> New query optimizations:
<ol type="a">
<li> Enable the <a href="../optoverview.html#like_opt">LIKE optimization</a> for cases when the ESCAPE keyword
is present and <a href="../pragma.html#pragma_case_sensitive_like">PRAGMA case_sensitive_like</a> is on.
<li> In queries that are driven by a <a href="../partialindex.html">partial index</a>, avoid unnecessary
tests of the constraint named in the WHERE clause of the partial
index, since we know that constraint must always be true.
</ol>
<li> Enhancements to the <a href="../tclsqlite.html">TCL Interface</a>:
<ol type="a">
<li> Added the -returntype option to the <a href="../tclsqlite.html#function">function method</a>.
<li> Added the new <a href="../tclsqlite.html#bind_fallback">bind_fallback method</a>.
</ol>
<li> Enhancements to the <a href="../cli.html">CLI</a>:
<ol type="a">
<li> Added support for <a href="../lang_expr.html#varparam">bound parameters</a> and the <a href="../cli.html#param">.parameter command</a>.
<li> Fix the <a href="../cli.html#fileio">readfile()</a> function so that it returns
an empty BLOB rather than throwing an out-of-memory error when
reading an empty file.
<li> Fix the <a href="../cli.html#fileio">writefile()</a> function so that when it
creates new directories along the path of a new file, it gives them
umask permissions rather than the same permissions as the file.
<li> Change <a href="../cli.html#arinsup">--update option</a> in the <a href="../cli.html#sqlar">.archive command</a> so that it skips
files that are already in the archive and are unchanged. Add the
new --insert option that works like --update used to work.
</ol>
<li> Added the <a href="https://sqlite.org/src/file/ext/misc/fossildelta.c">fossildelta.c</a>
extension that can create, apply, and deconstruct the
<a href="https://fossil-scm.org/fossil/doc/trunk/www/delta_format.wiki">Fossil DVCS file delta format</a>
that is used by the <a href="../rbu.html">RBU extension</a>.
<li> Added the <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigwritableschema">SQLITE_DBCONFIG_WRITABLE_SCHEMA</a> verb for the <a href="../c3ref/db_config.html">sqlite3_db_config()</a>
interface, that does the same work as <a href="../pragma.html#pragma_writable_schema">PRAGMA writable_schema</a> without using the
SQL parser.
<li> Added the <a href="../c3ref/value_blob.html">sqlite3_value_frombind()</a> API for determining if the argument
to an SQL function is from a <a href="../lang_expr.html#varparam">bound parameter</a>.
<li> Security and compatibilities enhancements to <a href="../fts3.html#f3tknzr">fts3_tokenizer()</a>:
<ol type="a">
<li> The <a href="../fts3.html#f3tknzr">fts3_tokenizer()</a> function always returns NULL
unless either the legacy application-defined FTS3 tokenizers interface
are enabled using
the <a href="../c3ref/db_config.html">sqlite3_db_config</a>(<a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigenablefts3tokenizer">SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</a>)
setting, or unless the first argument to fts3_tokenizer() is a <a href="../lang_expr.html#varparam">bound parameter</a>.
<li> The two-argument version of <a href="../fts3.html#f3tknzr">fts3_tokenizer()</a> accepts a pointer to the
tokenizer method object even without
the <a href="../c3ref/db_config.html">sqlite3_db_config</a>(<a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigenablefts3tokenizer">SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</a>) setting
if the second argument is a <a href="../lang_expr.html#varparam">bound parameter</a>
</ol>
<li> Improved robustness against corrupt database files.
<li> Miscellaneous performance enhancements
<li> Established a Git mirror of the offical SQLite source tree.
The canonical sources for SQLite are maintained using the
<a href="https://fossil-scm.org/">Fossil DVCS</a> at <a href="https://sqlite.org/src">https://sqlite.org/src</a>.
The Git mirror can be seen at <a href="https://github.com/sqlite/sqlite">https://github.com/sqlite/sqlite</a>.
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: 2019-04-16 19:49:53 884b4b7e502b4e991677b53971277adfaf0a04a284f8e483e2553d0f83156b50
<li>SHA3-256 for sqlite3.c: 411efca996b65448d9798eb203d6ebe9627b7161a646f5d00911e2902a57b2e9
</ol></p>
<p>A <a href="../changes.html">complete list of SQLite releases</a>
in a single page and a <a href="../chronology.html">chronology</a> are both also available.
A detailed history of every
check-in is available at
<a href="http://www.sqlite.org/src/timeline">
SQLite version control site</a>.</p>
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