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<h2>SQLite Release 3.19.1 On 2017-05-24</h2><p><b>Prior changes from version 3.19.0 (2017-05-22):</b></p>
<p><ol class='lessindent'>
<li value='1'> The <a href="../c3ref/c_alter_table.html">SQLITE_READ</a> <a href="../c3ref/set_authorizer.html">authorizer callback</a> is invoked once
with a column name that is an empty string
for every table referenced in a query from which no columns are extracted.
<li> When using an index on an expression, try to use expression values already
available in the index, rather than loading the original columns and recomputing
the expression.
<li> Enhance the <a href="../optoverview.html#flattening">flattening optimization</a> so that it is able to flatten views
on the right-hand side of a LEFT JOIN.
<li> Use <a href="../lang_corefunc.html#replace">replace()</a> instead of <a href="../lang_corefunc.html#char">char()</a> for escaping newline and carriage-return
characters embedded in strings in the .dump output from the <a href="../cli.html">command-line shell</a>.
<li> Avoid unnecessary foreign key processing in UPDATE statements that do not
touch the columns that are constrained by the foreign keys.
<li> On a DISTINCT query that uses an index, try to skip ahead to the next distinct
entry using the index rather than stepping through rows, when an appropriate
index is available.
<li> Avoid unnecessary invalidation of <a href="../c3ref/blob.html">sqlite3_blob</a> handles when making
changes to unrelated tables.
<li> Transfer any terms of the HAVING clause that use only columns mentioned in
the GROUP BY clause over to the WHERE clause for faster processing.
<li> Reuse the same materialization of a VIEW if that VIEW appears more than
once in the same query.
<li> Enhance <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> so that it identifies tables that have two
or more rows with the same <a href="../lang_createtable.html#rowid">rowid</a>.
<li> Enhance the <a href="../fts5.html">FTS5</a> query syntax so that <a href="../fts5.html#fts5_column_filters">column filters</a>
may be applied to arbitrary expressions.
<li> Enhance the <a href="../json1.html#jex">json_extract()</a> function to cache and reuse parses of JSON
input text.
<li> Added the <a href="https://sqlite.org/src/file/ext/misc/anycollseq.c">anycollseq.c</a>
<a href="../loadext.html">loadable extension</a> that allows a generic SQLite database connection to
read a schema that contains unknown and/or
application-specific <a href="../datatype3.html#collation">collating sequences</a>.
<p><b>Bug Fixes:</b>
<li> Fix a problem in <a href="../lang_replace.html">REPLACE</a> that can result in a corrupt database containing
two or more rows with the same <a href="../lang_createtable.html#rowid">rowid</a>. Fix for ticket
<a href="https://www.sqlite.org/src/info/f68dc596c4e6018d">f68dc596c4e6018d</a>.
<li> Fix a problem in <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> that was causing a subsequent
<a href="../lang_vacuum.html">VACUUM</a> to behave suboptimally.
<li> Fix the <a href="../pragma.html#pragma_foreign_key_check">PRAGMA foreign_key_check</a> command so that it works correctly with
foreign keys on <a href="../withoutrowid.html">WITHOUT ROWID</a> tables.
<li> Fix a bug in the b-tree logic that can result in incorrect duplicate answers
for IN operator queries. Ticket
<a href="https://sqlite.org/src/info/61fe9745">61fe9745</a>
<li> Disallow leading zeros in numeric constants in JSON. Fix for ticket
<a href="https://www.sqlite.org/src/info/b93be8729a895a528e2">b93be8729a895a528e2</a>.
<li> Disallow control characters inside of strings in JSON. Fix for ticket
<a href="https://www.sqlite.org/src/info/6c9b5514077fed34551">6c9b5514077fed34551</a>.
<li> Limit the depth of recursion for JSON objects and arrays in order to avoid
excess stack usage in the recursive descent parser. Fix for ticket
<a href="https://www.sqlite.org/src/info/981329adeef51011052">981329adeef51011052</a>.
</ol>
<p><b>Changes in this specific patch release, version 3.19.1 (2017-05-24):</b></p>
<p><ol class='lessindent'>
<li value='21'>Fix a bug in the LEFT JOIN <a href="../optoverview.html#flattening">flattening optimization</a>. Ticket
<a href="https://www.sqlite.org/src/info/cad1ab4cb7b0fc">cad1ab4cb7b0fc</a>.
<li>Remove a surplus semicolon that was causing problems for older versions of MSVC.
<p><b>Hashes:</b>
<li>SQLITE_SOURCE_ID: "2017-05-24 13:08:33 f6d7b988f40217821a382bc298180e9e6794f3ed79a83c6ef5cae048989b3f86"
<li>SHA3-256 for sqlite3.c: 996b2aff37b6e0c6663d0312cd921bbdf6826c989cbbb07dadde5e9672889bca
</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="https://www.sqlite.org/src/timeline">
SQLite version control site</a>.</p>
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