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  <section id="release-0-195">
<h1 id="release-release-0-195--page-root">Release 0.195<a class="headerlink" href="#release-release-0-195--page-root" title="Permalink to this heading">#</a></h1>
<section id="general">
<h2 id="general">General<a class="headerlink" href="#general" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Fix <a class="reference internal" href="../functions/aggregate.html#histogram" title="histogram"><code class="xref py py-func docutils literal notranslate"><span class="pre">histogram()</span></code></a> for map type when type coercion is required.</p></li>
<li><p>Fix <code class="docutils literal notranslate"><span class="pre">nullif</span></code> for map type when type coercion is required.</p></li>
<li><p>Fix incorrect termination of queries when the coordinator to worker communication is under high load.</p></li>
<li><p>Fix race condition that causes queries with a right or full outer join to fail.</p></li>
<li><p>Change reference counting for varchar, varbinary, and complex types to be approximate. This
approximation reduces GC activity when computing large aggregations with these types.</p></li>
<li><p>Change communication system to be more resilient to issues such as long GC pauses or networking errors.
The min/max sliding scale of for timeouts has been removed and instead only max time is used.
The <code class="docutils literal notranslate"><span class="pre">exchange.min-error-duration</span></code> and <code class="docutils literal notranslate"><span class="pre">query.remote-task.min-error-duration</span></code> are now ignored and will be
removed in a future release.</p></li>
<li><p>Increase coordinator timeout for cleanup of worker tasks for failed queries.  This improves the health of
the system when workers are offline for long periods due to GC or network errors.</p></li>
<li><p>Remove the <code class="docutils literal notranslate"><span class="pre">compiler.interpreter-enabled</span></code> config property.</p></li>
</ul>
</section>
<section id="security">
<h2 id="security">Security<a class="headerlink" href="#security" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Presto now supports generic password authentication using a pluggable <a class="reference internal" href="../develop/password-authenticator.html"><span class="doc">Password authenticator</span></a>.
Enable password authentication by setting <code class="docutils literal notranslate"><span class="pre">http-server.authentication.type</span></code> to include <code class="docutils literal notranslate"><span class="pre">PASSWORD</span></code> as an
authentication type.</p></li>
<li><p><a class="reference internal" href="../security/ldap.html"><span class="doc">LDAP authentication</span></a> is now implemented as a password authentication
plugin. You will need to update your configuration if you are using it.</p></li>
</ul>
</section>
<section id="cli-and-jdbc">
<h2 id="cli-and-jdbc">CLI and JDBC<a class="headerlink" href="#cli-and-jdbc" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Provide a better error message when TLS client certificates are expired or not yet valid.</p></li>
</ul>
</section>
<section id="mysql">
<h2 id="mysql">MySQL<a class="headerlink" href="#mysql" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Fix an error that can occur while listing tables if one of the listed tables is dropped.</p></li>
</ul>
</section>
<section id="hive">
<h2 id="hive">Hive<a class="headerlink" href="#hive" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Add support for LZ4 compressed ORC files.</p></li>
<li><p>Add support for reading Zstandard compressed ORC files.</p></li>
<li><p>Validate ORC compression block size when reading ORC files.</p></li>
<li><p>Set timeout of Thrift metastore client. This was accidentally removed in 0.191.</p></li>
</ul>
</section>
<section id="mysql-redis-kafka-and-mongodb">
<h2 id="mysql-redis-kafka-and-mongodb">MySQL, Redis, Kafka, and MongoDB<a class="headerlink" href="#mysql-redis-kafka-and-mongodb" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Fix failure when querying <code class="docutils literal notranslate"><span class="pre">information_schema.columns</span></code> when there is no equality predicate on <code class="docutils literal notranslate"><span class="pre">table_name</span></code>.</p></li>
</ul>
</section>
</section>


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