cpp-client-api/classkudu_1_1client_1_1KuduScanToken.html - kudu-site - Git at Google

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 <li class="navelem"><b>kudu</b></li><li class="navelem"><b>client</b></li><li class="navelem"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html">KuduScanToken</a></li>  </ul>
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 <a href="#pub-methods">Public Member Functions</a> &#124;
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 <div class="title">kudu::client::KuduScanToken Class Reference</div>  </div>
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 <p>A scan descriptor limited to a single physical contiguous location.
  <a href="classkudu_1_1client_1_1KuduScanToken.html#details">More...</a></p>

 <p><code>#include &lt;<a class="el" href="client_8h_source.html">client.h</a>&gt;</code></p>
 <table class="memberdecls">
 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
 Public Member Functions</h2></td></tr>
 <tr class="memitem:adb95c9538bb1fc4c83963557ce487292"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classkudu_1_1Status.html">Status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#adb95c9538bb1fc4c83963557ce487292">IntoKuduScanner</a> (<a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> **scanner) const WARN_UNUSED_RESULT</td></tr>
 <tr class="separator:adb95c9538bb1fc4c83963557ce487292"><td class="memSeparator" colspan="2">&#160;</td></tr>
 <tr class="memitem:a6513d5a02c745177d63d807de54aa301"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classkudu_1_1client_1_1KuduTablet.html">KuduTablet</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6513d5a02c745177d63d807de54aa301">tablet</a> () const </td></tr>
 <tr class="separator:a6513d5a02c745177d63d807de54aa301"><td class="memSeparator" colspan="2">&#160;</td></tr>
 <tr class="memitem:a6eb749ddf0a1434596d86df88341a008"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classkudu_1_1Status.html">Status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6eb749ddf0a1434596d86df88341a008">Serialize</a> (std::string *buf) const WARN_UNUSED_RESULT</td></tr>
 <tr class="separator:a6eb749ddf0a1434596d86df88341a008"><td class="memSeparator" colspan="2">&#160;</td></tr>
 </table><table class="memberdecls">
 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
 Static Public Member Functions</h2></td></tr>
 <tr class="memitem:ae90d9422476cf6eee5c33afb41d1f867"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classkudu_1_1Status.html">Status</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#ae90d9422476cf6eee5c33afb41d1f867">DeserializeIntoScanner</a> (<a class="el" href="classkudu_1_1client_1_1KuduClient.html">KuduClient</a> *client, const std::string &amp;serialized_token, <a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> **scanner) WARN_UNUSED_RESULT</td></tr>
 <tr class="separator:ae90d9422476cf6eee5c33afb41d1f867"><td class="memSeparator" colspan="2">&#160;</td></tr>
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 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
 <div class="textblock"><p>A scan descriptor limited to a single physical contiguous location. </p>
 <p>A <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html" title="A scan descriptor limited to a single physical contiguous location. ">KuduScanToken</a> describes a partial scan of a Kudu table limited to a single contiguous physical location. Using the <a class="el" href="classkudu_1_1client_1_1KuduScanTokenBuilder.html" title="Builds scan tokens for a table. ">KuduScanTokenBuilder</a>, clients can describe the desired scan, including predicates, bounds, timestamps, and caching, and receive back a collection of scan tokens.</p>
 <p>Each scan token may be separately turned into a scanner using <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#adb95c9538bb1fc4c83963557ce487292">KuduScanToken::IntoKuduScanner</a>, with each scanner responsible for a disjoint section of the table.</p>
 <p>Scan tokens may be serialized using the <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6eb749ddf0a1434596d86df88341a008">KuduScanToken::Serialize</a> method and deserialized back into a scanner using the <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#ae90d9422476cf6eee5c33afb41d1f867">KuduScanToken::DeserializeIntoScanner</a> method. This allows use cases such as generating scan tokens in the planner component of a query engine, then sending the tokens to execution nodes based on locality, and then instantiating the scanners on those nodes.</p>
 <p>Scan token locality information can be inspected using the <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6513d5a02c745177d63d807de54aa301">KuduScanToken::tablet()</a> function. </p>
 </div><h2 class="groupheader">Member Function Documentation</h2>
 <a class="anchor" id="ae90d9422476cf6eee5c33afb41d1f867"></a>
 <div class="memitem">
 <div class="memproto">
 <table class="mlabels">
   <tr>
   <td class="mlabels-left">
       <table class="memname">
         <tr>
           <td class="memname">static <a class="el" href="classkudu_1_1Status.html">Status</a> kudu::client::KuduScanToken::DeserializeIntoScanner </td>
           <td>(</td>
           <td class="paramtype"><a class="el" href="classkudu_1_1client_1_1KuduClient.html">KuduClient</a> *&#160;</td>
           <td class="paramname"><em>client</em>, </td>
         </tr>
         <tr>
           <td class="paramkey"></td>
           <td></td>
           <td class="paramtype">const std::string &amp;&#160;</td>
           <td class="paramname"><em>serialized_token</em>, </td>
         </tr>
         <tr>
           <td class="paramkey"></td>
           <td></td>
           <td class="paramtype"><a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> **&#160;</td>
           <td class="paramname"><em>scanner</em>&#160;</td>
         </tr>
         <tr>
           <td></td>
           <td>)</td>
           <td></td><td></td>
         </tr>
       </table>
   </td>
   <td class="mlabels-right">
 <span class="mlabels"><span class="mlabel">static</span></span>  </td>
   </tr>
 </table>
 </div><div class="memdoc">
 <p>Create a new scanner and set the scanner options.</p>
 <dl class="params"><dt>Parameters</dt><dd>
   <table class="params">
     <tr><td class="paramdir">[in]</td><td class="paramname">client</td><td>Client to bound to the scanner. </td></tr>
     <tr><td class="paramdir">[in]</td><td class="paramname">serialized_token</td><td>Token containing serialized scanner parameters. </td></tr>
     <tr><td class="paramdir">[out]</td><td class="paramname">scanner</td><td>The result scanner. The caller owns the new scanner. The scanner must be opened before use. The scanner will not be set if the returned status is an error. </td></tr>
   </table>
   </dd>
 </dl>
 <dl class="section return"><dt>Returns</dt><dd>Operation result status. </dd></dl>

 </div>
 </div>
 <a class="anchor" id="adb95c9538bb1fc4c83963557ce487292"></a>
 <div class="memitem">
 <div class="memproto">
       <table class="memname">
         <tr>
           <td class="memname"><a class="el" href="classkudu_1_1Status.html">Status</a> kudu::client::KuduScanToken::IntoKuduScanner </td>
           <td>(</td>
           <td class="paramtype"><a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> **&#160;</td>
           <td class="paramname"><em>scanner</em></td><td>)</td>
           <td> const</td>
         </tr>
       </table>
 </div><div class="memdoc">
 <p>Create a new scanner.</p>
 <p>This method creates a new scanner, setting the result scanner's options according to the scan token.</p>
 <dl class="params"><dt>Parameters</dt><dd>
   <table class="params">
     <tr><td class="paramdir">[out]</td><td class="paramname">scanner</td><td>The result scanner. The caller owns the new scanner. The scanner must be opened before use. The output parameter will not be set if the returned status is an error. </td></tr>
   </table>
   </dd>
 </dl>
 <dl class="section return"><dt>Returns</dt><dd>Operation result status. </dd></dl>

 </div>
 </div>
 <a class="anchor" id="a6eb749ddf0a1434596d86df88341a008"></a>
 <div class="memitem">
 <div class="memproto">
       <table class="memname">
         <tr>
           <td class="memname"><a class="el" href="classkudu_1_1Status.html">Status</a> kudu::client::KuduScanToken::Serialize </td>
           <td>(</td>
           <td class="paramtype">std::string *&#160;</td>
           <td class="paramname"><em>buf</em></td><td>)</td>
           <td> const</td>
         </tr>
       </table>
 </div><div class="memdoc">
 <p>Serialize the token into a string.</p>
 <p>Deserialize with <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#ae90d9422476cf6eee5c33afb41d1f867">KuduScanToken::DeserializeIntoScanner()</a>.</p>
 <dl class="params"><dt>Parameters</dt><dd>
   <table class="params">
     <tr><td class="paramdir">[out]</td><td class="paramname">buf</td><td>Result string to output the serialized token. </td></tr>
   </table>
   </dd>
 </dl>
 <dl class="section return"><dt>Returns</dt><dd>Operation result status. </dd></dl>

 </div>
 </div>
 <a class="anchor" id="a6513d5a02c745177d63d807de54aa301"></a>
 <div class="memitem">
 <div class="memproto">
       <table class="memname">
         <tr>
           <td class="memname">const <a class="el" href="classkudu_1_1client_1_1KuduTablet.html">KuduTablet</a>&amp; kudu::client::KuduScanToken::tablet </td>
           <td>(</td>
           <td class="paramname"></td><td>)</td>
           <td> const</td>
         </tr>
       </table>
 </div><div class="memdoc">
 <dl class="section return"><dt>Returns</dt><dd>Tablet that this scan will retrieve rows from. </dd></dl>

 </div>
 </div>
 <hr/>The documentation for this class was generated from the following file:<ul>
 <li>include/kudu/client/<a class="el" href="client_8h_source.html">client.h</a></li>
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	<li class="navelem"><b>kudu</b></li><li class="navelem"><b>client</b></li><li class="navelem"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html">KuduScanToken</a></li> </ul>
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	<a href="#pub-methods">Public Member Functions</a> \|
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	<p>A scan descriptor limited to a single physical contiguous location.
	<a href="classkudu_1_1client_1_1KuduScanToken.html#details">More...</a></p>

	<p><code>#include <<a class="el" href="client_8h_source.html">client.h</a>></code></p>
	<table class="memberdecls">
	<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
	Public Member Functions</h2></td></tr>
	<tr class="memitem:adb95c9538bb1fc4c83963557ce487292"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classkudu_1_1Status.html">Status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#adb95c9538bb1fc4c83963557ce487292">IntoKuduScanner</a> (<a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> **scanner) const WARN_UNUSED_RESULT</td></tr>
	<tr class="separator:adb95c9538bb1fc4c83963557ce487292"><td class="memSeparator" colspan="2"> </td></tr>
	<tr class="memitem:a6513d5a02c745177d63d807de54aa301"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classkudu_1_1client_1_1KuduTablet.html">KuduTablet</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6513d5a02c745177d63d807de54aa301">tablet</a> () const </td></tr>
	<tr class="separator:a6513d5a02c745177d63d807de54aa301"><td class="memSeparator" colspan="2"> </td></tr>
	<tr class="memitem:a6eb749ddf0a1434596d86df88341a008"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classkudu_1_1Status.html">Status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6eb749ddf0a1434596d86df88341a008">Serialize</a> (std::string *buf) const WARN_UNUSED_RESULT</td></tr>
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	Static Public Member Functions</h2></td></tr>
	<tr class="memitem:ae90d9422476cf6eee5c33afb41d1f867"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classkudu_1_1Status.html">Status</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#ae90d9422476cf6eee5c33afb41d1f867">DeserializeIntoScanner</a> (<a class="el" href="classkudu_1_1client_1_1KuduClient.html">KuduClient</a> client, const std::string &serialized_token, <a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> *scanner) WARN_UNUSED_RESULT</td></tr>
	<tr class="separator:ae90d9422476cf6eee5c33afb41d1f867"><td class="memSeparator" colspan="2"> </td></tr>
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	<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
	<div class="textblock"><p>A scan descriptor limited to a single physical contiguous location. </p>
	<p>A <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html" title="A scan descriptor limited to a single physical contiguous location. ">KuduScanToken</a> describes a partial scan of a Kudu table limited to a single contiguous physical location. Using the <a class="el" href="classkudu_1_1client_1_1KuduScanTokenBuilder.html" title="Builds scan tokens for a table. ">KuduScanTokenBuilder</a>, clients can describe the desired scan, including predicates, bounds, timestamps, and caching, and receive back a collection of scan tokens.</p>
	<p>Each scan token may be separately turned into a scanner using <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#adb95c9538bb1fc4c83963557ce487292">KuduScanToken::IntoKuduScanner</a>, with each scanner responsible for a disjoint section of the table.</p>
	<p>Scan tokens may be serialized using the <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6eb749ddf0a1434596d86df88341a008">KuduScanToken::Serialize</a> method and deserialized back into a scanner using the <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#ae90d9422476cf6eee5c33afb41d1f867">KuduScanToken::DeserializeIntoScanner</a> method. This allows use cases such as generating scan tokens in the planner component of a query engine, then sending the tokens to execution nodes based on locality, and then instantiating the scanners on those nodes.</p>
	<p>Scan token locality information can be inspected using the <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#a6513d5a02c745177d63d807de54aa301">KuduScanToken::tablet()</a> function. </p>
	</div><h2 class="groupheader">Member Function Documentation</h2>
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	<td class="memname">static <a class="el" href="classkudu_1_1Status.html">Status</a> kudu::client::KuduScanToken::DeserializeIntoScanner </td>
	<td>(</td>
	<td class="paramtype"><a class="el" href="classkudu_1_1client_1_1KuduClient.html">KuduClient</a> * </td>
	<td class="paramname"><em>client</em>, </td>
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	<td class="paramtype">const std::string & </td>
	<td class="paramname"><em>serialized_token</em>, </td>
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	<td></td>
	<td class="paramtype"><a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> ** </td>
	<td class="paramname"><em>scanner</em> </td>
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	<td></td>
	<td>)</td>
	<td></td><td></td>
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	<p>Create a new scanner and set the scanner options.</p>
	<dl class="params"><dt>Parameters</dt><dd>
	<table class="params">
	<tr><td class="paramdir">[in]</td><td class="paramname">client</td><td>Client to bound to the scanner. </td></tr>
	<tr><td class="paramdir">[in]</td><td class="paramname">serialized_token</td><td>Token containing serialized scanner parameters. </td></tr>
	<tr><td class="paramdir">[out]</td><td class="paramname">scanner</td><td>The result scanner. The caller owns the new scanner. The scanner must be opened before use. The scanner will not be set if the returned status is an error. </td></tr>
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	<dl class="section return"><dt>Returns</dt><dd>Operation result status. </dd></dl>

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	<td class="memname"><a class="el" href="classkudu_1_1Status.html">Status</a> kudu::client::KuduScanToken::IntoKuduScanner </td>
	<td>(</td>
	<td class="paramtype"><a class="el" href="classkudu_1_1client_1_1KuduScanner.html">KuduScanner</a> ** </td>
	<td class="paramname"><em>scanner</em></td><td>)</td>
	<td> const</td>
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	<p>Create a new scanner.</p>
	<p>This method creates a new scanner, setting the result scanner's options according to the scan token.</p>
	<dl class="params"><dt>Parameters</dt><dd>
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	<tr><td class="paramdir">[out]</td><td class="paramname">scanner</td><td>The result scanner. The caller owns the new scanner. The scanner must be opened before use. The output parameter will not be set if the returned status is an error. </td></tr>
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	</dd>
	</dl>
	<dl class="section return"><dt>Returns</dt><dd>Operation result status. </dd></dl>

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	<td class="memname"><a class="el" href="classkudu_1_1Status.html">Status</a> kudu::client::KuduScanToken::Serialize </td>
	<td>(</td>
	<td class="paramtype">std::string * </td>
	<td class="paramname"><em>buf</em></td><td>)</td>
	<td> const</td>
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	<p>Serialize the token into a string.</p>
	<p>Deserialize with <a class="el" href="classkudu_1_1client_1_1KuduScanToken.html#ae90d9422476cf6eee5c33afb41d1f867">KuduScanToken::DeserializeIntoScanner()</a>.</p>
	<dl class="params"><dt>Parameters</dt><dd>
	<table class="params">
	<tr><td class="paramdir">[out]</td><td class="paramname">buf</td><td>Result string to output the serialized token. </td></tr>
	</table>
	</dd>
	</dl>
	<dl class="section return"><dt>Returns</dt><dd>Operation result status. </dd></dl>

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	<td class="memname">const <a class="el" href="classkudu_1_1client_1_1KuduTablet.html">KuduTablet</a>& kudu::client::KuduScanToken::tablet </td>
	<td>(</td>
	<td class="paramname"></td><td>)</td>
	<td> const</td>
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	<dl class="section return"><dt>Returns</dt><dd>Tablet that this scan will retrieve rows from. </dd></dl>

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	</div>
	<hr/>The documentation for this class was generated from the following file:<ul>
	<li>include/kudu/client/<a class="el" href="client_8h_source.html">client.h</a></li>
	</ul>
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