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<li class="toctree-l2 current"><a class="current reference internal" href="#">Changes</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#id1">3.4.3</a></li>
<li class="toctree-l3"><a class="reference internal" href="#id2">3.4.2</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#id8">3.1.7</a></li>
<li class="toctree-l3"><a class="reference internal" href="#id9">3.1.6</a></li>
<li class="toctree-l3"><a class="reference internal" href="#id10">3.1.5</a></li>
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  <div class="section" id="changes">
<h1>Changes<a class="headerlink" href="#changes" title="Permalink to this headline">¶</a></h1>
<p>The following describes the changes in each version of CQL.</p>
<div class="section" id="id1">
<h2>3.4.3<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Support for <code class="docutils literal"><span class="pre">GROUP</span> <span class="pre">BY</span></code> (<a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-10707">CASSANDRA-10707</a>).</li>
<li>Adds a <code class="docutils literal"><span class="pre">DEFAULT</span> <span class="pre">UNSET</span></code> option for <code class="docutils literal"><span class="pre">INSERT</span> <span class="pre">JSON</span></code> to ignore omitted columns (<a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-11424">CASSANDRA-11424</a>).</li>
<li>Allows <code class="docutils literal"><span class="pre">null</span></code> as a legal value for TTL on insert and update. It will be treated as equivalent to</li>
</ul>
<p>inserting a 0 (<a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-12216">CASSANDRA-12216</a>).</p>
</div>
<div class="section" id="id2">
<h2>3.4.2<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>If a table has a non zero <code class="docutils literal"><span class="pre">default_time_to_live</span></code>, then explicitly specifying a TTL of 0 in an <code class="docutils literal"><span class="pre">INSERT</span></code> or
<code class="docutils literal"><span class="pre">UPDATE</span></code> statement will result in the new writes not having any expiration (that is, an explicit TTL of 0 cancels
the <code class="docutils literal"><span class="pre">default_time_to_live</span></code>). This wasn&#8217;t the case before and the <code class="docutils literal"><span class="pre">default_time_to_live</span></code> was applied even though a
TTL had been explicitly set.</li>
<li><code class="docutils literal"><span class="pre">ALTER</span> <span class="pre">TABLE</span></code> <code class="docutils literal"><span class="pre">ADD</span></code> and <code class="docutils literal"><span class="pre">DROP</span></code> now allow multiple columns to be added/removed.</li>
<li>New <code class="docutils literal"><span class="pre">PER</span> <span class="pre">PARTITION</span> <span class="pre">LIMIT</span></code> option for <code class="docutils literal"><span class="pre">SELECT</span></code> statements (see <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-7017)">CASSANDRA-7017</a>.</li>
<li><a class="reference internal" href="functions.html#cql-functions"><span class="std std-ref">User-defined functions</span></a> can now instantiate <code class="docutils literal"><span class="pre">UDTValue</span></code> and <code class="docutils literal"><span class="pre">TupleValue</span></code> instances via the
new <code class="docutils literal"><span class="pre">UDFContext</span></code> interface (see <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-10818)">CASSANDRA-10818</a>.</li>
<li><a class="reference internal" href="types.html#udts"><span class="std std-ref">User-defined types</span></a> may now be stored in a non-frozen form, allowing individual fields to be updated and
deleted in <code class="docutils literal"><span class="pre">UPDATE</span></code> statements and <code class="docutils literal"><span class="pre">DELETE</span></code> statements, respectively. (<a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-7423)">CASSANDRA-7423</a>).</li>
</ul>
</div>
<div class="section" id="id3">
<h2>3.4.1<a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Adds <code class="docutils literal"><span class="pre">CAST</span></code> functions.</li>
</ul>
</div>
<div class="section" id="id4">
<h2>3.4.0<a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Support for <a class="reference internal" href="mvs.html#materialized-views"><span class="std std-ref">materialized views</span></a>.</li>
<li><code class="docutils literal"><span class="pre">DELETE</span></code> support for inequality expressions and <code class="docutils literal"><span class="pre">IN</span></code> restrictions on any primary key columns.</li>
<li><code class="docutils literal"><span class="pre">UPDATE</span></code> support for <code class="docutils literal"><span class="pre">IN</span></code> restrictions on any primary key columns.</li>
</ul>
</div>
<div class="section" id="id5">
<h2>3.3.1<a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>The syntax <code class="docutils literal"><span class="pre">TRUNCATE</span> <span class="pre">TABLE</span> <span class="pre">X</span></code> is now accepted as an alias for <code class="docutils literal"><span class="pre">TRUNCATE</span> <span class="pre">X</span></code>.</li>
</ul>
</div>
<div class="section" id="id6">
<h2>3.3.0<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><a class="reference internal" href="functions.html#cql-functions"><span class="std std-ref">User-defined functions and aggregates</span></a> are now supported.</li>
<li>Allows double-dollar enclosed strings literals as an alternative to single-quote enclosed strings.</li>
<li>Introduces Roles to supersede user based authentication and access control</li>
<li>New <code class="docutils literal"><span class="pre">date</span></code>, <code class="docutils literal"><span class="pre">time</span></code>, <code class="docutils literal"><span class="pre">tinyint</span></code> and <code class="docutils literal"><span class="pre">smallint</span></code> <a class="reference internal" href="types.html#data-types"><span class="std std-ref">data types</span></a> have been added.</li>
<li><a class="reference internal" href="json.html#cql-json"><span class="std std-ref">JSON support</span></a> has been added</li>
<li>Adds new time conversion functions and deprecate <code class="docutils literal"><span class="pre">dateOf</span></code> and <code class="docutils literal"><span class="pre">unixTimestampOf</span></code>.</li>
</ul>
</div>
<div class="section" id="id7">
<h2>3.2.0<a class="headerlink" href="#id7" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><a class="reference internal" href="types.html#udts"><span class="std std-ref">User-defined types</span></a> supported.</li>
<li><code class="docutils literal"><span class="pre">CREATE</span> <span class="pre">INDEX</span></code> now supports indexing collection columns, including indexing the keys of map collections through the
<code class="docutils literal"><span class="pre">keys()</span></code> function</li>
<li>Indexes on collections may be queried using the new <code class="docutils literal"><span class="pre">CONTAINS</span></code> and <code class="docutils literal"><span class="pre">CONTAINS</span> <span class="pre">KEY</span></code> operators</li>
<li><a class="reference internal" href="types.html#tuples"><span class="std std-ref">Tuple types</span></a> were added to hold fixed-length sets of typed positional fields.</li>
<li><code class="docutils literal"><span class="pre">DROP</span> <span class="pre">INDEX</span></code> now supports optionally specifying a keyspace.</li>
</ul>
</div>
<div class="section" id="id8">
<h2>3.1.7<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">SELECT</span></code> statements now support selecting multiple rows in a single partition using an <code class="docutils literal"><span class="pre">IN</span></code> clause on combinations
of clustering columns.</li>
<li><code class="docutils literal"><span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span></code> and <code class="docutils literal"><span class="pre">IF</span> <span class="pre">EXISTS</span></code> syntax is now supported by <code class="docutils literal"><span class="pre">CREATE</span> <span class="pre">USER</span></code> and <code class="docutils literal"><span class="pre">DROP</span> <span class="pre">USER</span></code> statements,
respectively.</li>
</ul>
</div>
<div class="section" id="id9">
<h2>3.1.6<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>A new <code class="docutils literal"><span class="pre">uuid()</span></code> method has been added.</li>
<li>Support for <code class="docutils literal"><span class="pre">DELETE</span> <span class="pre">...</span> <span class="pre">IF</span> <span class="pre">EXISTS</span></code> syntax.</li>
</ul>
</div>
<div class="section" id="id10">
<h2>3.1.5<a class="headerlink" href="#id10" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>It is now possible to group clustering columns in a relation, see <a class="reference internal" href="dml.html#where-clause"><span class="std std-ref">WHERE</span></a> clauses.</li>
<li>Added support for <a class="reference internal" href="ddl.html#static-columns"><span class="std std-ref">static columns</span></a>.</li>
</ul>
</div>
<div class="section" id="id11">
<h2>3.1.4<a class="headerlink" href="#id11" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">CREATE</span> <span class="pre">INDEX</span></code> now allows specifying options when creating CUSTOM indexes.</li>
</ul>
</div>
<div class="section" id="id12">
<h2>3.1.3<a class="headerlink" href="#id12" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Millisecond precision formats have been added to the <a class="reference internal" href="types.html#timestamps"><span class="std std-ref">timestamp</span></a> parser.</li>
</ul>
</div>
<div class="section" id="id13">
<h2>3.1.2<a class="headerlink" href="#id13" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">NaN</span></code> and <code class="docutils literal"><span class="pre">Infinity</span></code> has been added as valid float constants. They are now reserved keywords. In the unlikely case
you we using them as a column identifier (or keyspace/table one), you will now need to double quote them.</li>
</ul>
</div>
<div class="section" id="id14">
<h2>3.1.1<a class="headerlink" href="#id14" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">SELECT</span></code> statement now allows listing the partition keys (using the <code class="docutils literal"><span class="pre">DISTINCT</span></code> modifier). See <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-4536">CASSANDRA-4536</a>.</li>
<li>The syntax <code class="docutils literal"><span class="pre">c</span> <span class="pre">IN</span> <span class="pre">?</span></code> is now supported in <code class="docutils literal"><span class="pre">WHERE</span></code> clauses. In that case, the value expected for the bind variable
will be a list of whatever type <code class="docutils literal"><span class="pre">c</span></code> is.</li>
<li>It is now possible to use named bind variables (using <code class="docutils literal"><span class="pre">:name</span></code> instead of <code class="docutils literal"><span class="pre">?</span></code>).</li>
</ul>
</div>
<div class="section" id="id15">
<h2>3.1.0<a class="headerlink" href="#id15" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">ALTER</span> <span class="pre">TABLE</span></code> <code class="docutils literal"><span class="pre">DROP</span></code> option added.</li>
<li><code class="docutils literal"><span class="pre">SELECT</span></code> statement now supports aliases in select clause. Aliases in WHERE and ORDER BY clauses are not supported.</li>
<li><code class="docutils literal"><span class="pre">CREATE</span></code> statements for <code class="docutils literal"><span class="pre">KEYSPACE</span></code>, <code class="docutils literal"><span class="pre">TABLE</span></code> and <code class="docutils literal"><span class="pre">INDEX</span></code> now supports an <code class="docutils literal"><span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span></code> condition.
Similarly, <code class="docutils literal"><span class="pre">DROP</span></code> statements support a <code class="docutils literal"><span class="pre">IF</span> <span class="pre">EXISTS</span></code> condition.</li>
<li><code class="docutils literal"><span class="pre">INSERT</span></code> statements optionally supports a <code class="docutils literal"><span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span></code> condition and <code class="docutils literal"><span class="pre">UPDATE</span></code> supports <code class="docutils literal"><span class="pre">IF</span></code> conditions.</li>
</ul>
</div>
<div class="section" id="id16">
<h2>3.0.5<a class="headerlink" href="#id16" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">SELECT</span></code>, <code class="docutils literal"><span class="pre">UPDATE</span></code>, and <code class="docutils literal"><span class="pre">DELETE</span></code> statements now allow empty <code class="docutils literal"><span class="pre">IN</span></code> relations (see <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-5626)">CASSANDRA-5626</a>.</li>
</ul>
</div>
<div class="section" id="id17">
<h2>3.0.4<a class="headerlink" href="#id17" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Updated the syntax for custom <a class="reference internal" href="indexes.html#secondary-indexes"><span class="std std-ref">secondary indexes</span></a>.</li>
<li>Non-equal condition on the partition key are now never supported, even for ordering partitioner as this was not
correct (the order was <strong>not</strong> the one of the type of the partition key). Instead, the <code class="docutils literal"><span class="pre">token</span></code> method should always
be used for range queries on the partition key (see <a class="reference internal" href="dml.html#where-clause"><span class="std std-ref">WHERE clauses</span></a>).</li>
</ul>
</div>
<div class="section" id="id18">
<h2>3.0.3<a class="headerlink" href="#id18" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Support for custom <a class="reference internal" href="indexes.html#secondary-indexes"><span class="std std-ref">secondary indexes</span></a> has been added.</li>
</ul>
</div>
<div class="section" id="id19">
<h2>3.0.2<a class="headerlink" href="#id19" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Type validation for the <a class="reference internal" href="definitions.html#constants"><span class="std std-ref">constants</span></a> has been fixed. For instance, the implementation used to allow
<code class="docutils literal"><span class="pre">'2'</span></code> as a valid value for an <code class="docutils literal"><span class="pre">int</span></code> column (interpreting it has the equivalent of <code class="docutils literal"><span class="pre">2</span></code>), or <code class="docutils literal"><span class="pre">42</span></code> as a valid
<code class="docutils literal"><span class="pre">blob</span></code> value (in which case <code class="docutils literal"><span class="pre">42</span></code> was interpreted as an hexadecimal representation of the blob). This is no longer
the case, type validation of constants is now more strict. See the <a class="reference internal" href="types.html#data-types"><span class="std std-ref">data types</span></a> section for details
on which constant is allowed for which type.</li>
<li>The type validation fixed of the previous point has lead to the introduction of blobs constants to allow the input of
blobs. Do note that while the input of blobs as strings constant is still supported by this version (to allow smoother
transition to blob constant), it is now deprecated and will be removed by a future version. If you were using strings
as blobs, you should thus update your client code ASAP to switch blob constants.</li>
<li>A number of functions to convert native types to blobs have also been introduced. Furthermore the token function is
now also allowed in select clauses. See the <a class="reference internal" href="functions.html#cql-functions"><span class="std std-ref">section on functions</span></a> for details.</li>
</ul>
</div>
<div class="section" id="id20">
<h2>3.0.1<a class="headerlink" href="#id20" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Date strings (and timestamps) are no longer accepted as valid <code class="docutils literal"><span class="pre">timeuuid</span></code> values. Doing so was a bug in the sense
that date string are not valid <code class="docutils literal"><span class="pre">timeuuid</span></code>, and it was thus resulting in <a class="reference external" href="https://issues.apache.org/jira/browse/CASSANDRA-4936">confusing behaviors</a>. However, the following new methods have been added to help
working with <code class="docutils literal"><span class="pre">timeuuid</span></code>: <code class="docutils literal"><span class="pre">now</span></code>, <code class="docutils literal"><span class="pre">minTimeuuid</span></code>, <code class="docutils literal"><span class="pre">maxTimeuuid</span></code> ,
<code class="docutils literal"><span class="pre">dateOf</span></code> and <code class="docutils literal"><span class="pre">unixTimestampOf</span></code>.</li>
<li>Float constants now support the exponent notation. In other words, <code class="docutils literal"><span class="pre">4.2E10</span></code> is now a valid floating point value.</li>
</ul>
</div>
<div class="section" id="versioning">
<h2>Versioning<a class="headerlink" href="#versioning" title="Permalink to this headline">¶</a></h2>
<p>Versioning of the CQL language adheres to the <a class="reference external" href="http://semver.org">Semantic Versioning</a> guidelines. Versions take the
form X.Y.Z where X, Y, and Z are integer values representing major, minor, and patch level respectively. There is no
correlation between Cassandra release versions and the CQL language version.</p>
<table border="1" class="docutils">
<colgroup>
<col width="8%" />
<col width="92%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">version</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>Major</td>
<td>The major version <em>must</em> be bumped when backward incompatible changes are introduced. This should rarely
occur.</td>
</tr>
<tr class="row-odd"><td>Minor</td>
<td>Minor version increments occur when new, but backward compatible, functionality is introduced.</td>
</tr>
<tr class="row-even"><td>Patch</td>
<td>The patch version is incremented when bugs are fixed.</td>
</tr>
</tbody>
</table>
</div>
</div>


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