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 <div class="subTitle">org.apache.hadoop.hbase.regionserver.querymatcher</div>
 <h2 title="Interface ColumnTracker" class="title">Interface ColumnTracker</h2>
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 <dl>
 <dt>All Superinterfaces:</dt>
 <dd><a href="../../../../../../org/apache/hadoop/hbase/regionserver/ShipperListener.html" title="interface in org.apache.hadoop.hbase.regionserver">ShipperListener</a></dd>
 </dl>
 <dl>
 <dt>All Known Implementing Classes:</dt>
 <dd><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ExplicitColumnTracker.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher">ExplicitColumnTracker</a>, <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/NewVersionBehaviorTracker.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher">NewVersionBehaviorTracker</a>, <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanWildcardColumnTracker.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher">ScanWildcardColumnTracker</a>, <a href="../../../../../../org/apache/hadoop/hbase/security/visibility/VisibilityNewVersionBehaivorTracker.html" title="class in org.apache.hadoop.hbase.security.visibility">VisibilityNewVersionBehaivorTracker</a></dd>
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 <pre>@InterfaceAudience.Private
 public interface <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.54">ColumnTracker</a>
 extends <a href="../../../../../../org/apache/hadoop/hbase/regionserver/ShipperListener.html" title="interface in org.apache.hadoop.hbase.regionserver">ShipperListener</a></pre>
 <div class="block">Implementing classes of this interface will be used for the tracking
  and enforcement of columns and numbers of versions and timeToLive during
  the course of a Get or Scan operation.
  <p>
  Currently there are two different types of Store/Family-level queries.
  <ul><li><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ExplicitColumnTracker.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher"><code>ExplicitColumnTracker</code></a> is used when the query specifies
  one or more column qualifiers to return in the family.</li>
  <li><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanWildcardColumnTracker.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher"><code>ScanWildcardColumnTracker</code></a> is used when no columns are
  explicitly specified.</li>
  </ul>
  <p>
  This class is utilized by <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher"><code>ScanQueryMatcher</code></a> mainly through two methods:
  <ul><li><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#checkColumn-org.apache.hadoop.hbase.Cell-byte-"><code>checkColumn(org.apache.hadoop.hbase.Cell, byte)</code></a> is called when a Put satisfies all other
  conditions of the query.</li>
  <li><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#getNextRowOrNextColumn-org.apache.hadoop.hbase.Cell-"><code>getNextRowOrNextColumn(org.apache.hadoop.hbase.Cell)</code></a> is called whenever ScanQueryMatcher
  believes that the current column should be skipped (by timestamp, filter etc.)</li>
  </ul>
  <p>
  These two methods returns a
  <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html" title="enum in org.apache.hadoop.hbase.regionserver.querymatcher"><code>ScanQueryMatcher.MatchCode</code></a>
  to define what action should be taken.
  <p>
  This class is NOT thread-safe as queries are never multi-threaded</div>
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 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html" title="enum in org.apache.hadoop.hbase.regionserver.querymatcher">ScanQueryMatcher.MatchCode</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#checkColumn-org.apache.hadoop.hbase.Cell-byte-">checkColumn</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
            byte&nbsp;type)</code>
 <div class="block">Checks if the column is present in the list of requested columns by returning the match code
  instance.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html" title="enum in org.apache.hadoop.hbase.regionserver.querymatcher">ScanQueryMatcher.MatchCode</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#checkVersions-org.apache.hadoop.hbase.Cell-long-byte-boolean-">checkVersions</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
              long&nbsp;timestamp,
              byte&nbsp;type,
              boolean&nbsp;ignoreCount)</code>
 <div class="block">Keeps track of the number of versions for the columns asked for.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#done--">done</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>default void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#doneWithColumn-org.apache.hadoop.hbase.Cell-">doneWithColumn</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell)</code>
 <div class="block">This method is used to inform the column tracker that we are done with this column.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnCount.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher">ColumnCount</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#getColumnHint--">getColumnHint</a></span>()</code>
 <div class="block">Used by matcher and scan/get to get a hint of the next column
  to seek to after checkColumn() returns SKIP.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html" title="enum in org.apache.hadoop.hbase.regionserver.querymatcher">ScanQueryMatcher.MatchCode</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#getNextRowOrNextColumn-org.apache.hadoop.hbase.Cell-">getNextRowOrNextColumn</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell)</code>
 <div class="block">Retrieve the MatchCode for the next row or column</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#isDone-long-">isDone</a></span>(long&nbsp;timestamp)</code>
 <div class="block">Give the tracker a chance to declare it's done based on only the timestamp
  to allow an early out.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#reset--">reset</a></span>()</code>
 <div class="block">Resets the Matcher</div>
 </td>
 </tr>
 </table>
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 <h3>Methods inherited from interface&nbsp;org.apache.hadoop.hbase.regionserver.<a href="../../../../../../org/apache/hadoop/hbase/regionserver/ShipperListener.html" title="interface in org.apache.hadoop.hbase.regionserver">ShipperListener</a></h3>
 <code><a href="../../../../../../org/apache/hadoop/hbase/regionserver/ShipperListener.html#beforeShipped--">beforeShipped</a></code></li>
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 <h3>Method Detail</h3>
 <a name="checkColumn-org.apache.hadoop.hbase.Cell-byte-">
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 <h4>checkColumn</h4>
 <pre><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html" title="enum in org.apache.hadoop.hbase.regionserver.querymatcher">ScanQueryMatcher.MatchCode</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.69">checkColumn</a>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
                                        byte&nbsp;type)
                                 throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Checks if the column is present in the list of requested columns by returning the match code
  instance. It does not check against the number of versions for the columns asked for. To do the
  version check, one has to call <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#checkVersions-org.apache.hadoop.hbase.Cell-long-byte-boolean-"><code>checkVersions(Cell, long, byte, boolean)</code></a>
  method based on the return type (INCLUDE) of this method. The values that can be returned by
  this method are <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#INCLUDE"><code>ScanQueryMatcher.MatchCode.INCLUDE</code></a>, <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#SEEK_NEXT_COL"><code>ScanQueryMatcher.MatchCode.SEEK_NEXT_COL</code></a> and
  <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#SEEK_NEXT_ROW"><code>ScanQueryMatcher.MatchCode.SEEK_NEXT_ROW</code></a>.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cell</code> - a cell with the column to match against</dd>
 <dd><code>type</code> - The type of the Cell</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The match code instance.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - in case there is an internal consistency problem caused by a data
            corruption.</dd>
 </dl>
 </li>
 </ul>
 <a name="checkVersions-org.apache.hadoop.hbase.Cell-long-byte-boolean-">
 <!--   -->
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 <h4>checkVersions</h4>
 <pre><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html" title="enum in org.apache.hadoop.hbase.regionserver.querymatcher">ScanQueryMatcher.MatchCode</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.89">checkVersions</a>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell,
                                          long&nbsp;timestamp,
                                          byte&nbsp;type,
                                          boolean&nbsp;ignoreCount)
                                   throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Keeps track of the number of versions for the columns asked for. It assumes that the user has
  already checked if the cell needs to be included by calling the
  <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#checkColumn-org.apache.hadoop.hbase.Cell-byte-"><code>checkColumn(Cell, byte)</code></a> method. The enum values returned by this method
  are <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#SKIP"><code>ScanQueryMatcher.MatchCode.SKIP</code></a>, <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#INCLUDE"><code>ScanQueryMatcher.MatchCode.INCLUDE</code></a>,
  <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#INCLUDE_AND_SEEK_NEXT_COL"><code>ScanQueryMatcher.MatchCode.INCLUDE_AND_SEEK_NEXT_COL</code></a> and <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#INCLUDE_AND_SEEK_NEXT_ROW"><code>ScanQueryMatcher.MatchCode.INCLUDE_AND_SEEK_NEXT_ROW</code></a>.
  Implementations which include all the columns could just return <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html#INCLUDE"><code>ScanQueryMatcher.MatchCode.INCLUDE</code></a> in
  the <a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#checkColumn-org.apache.hadoop.hbase.Cell-byte-"><code>checkColumn(Cell, byte)</code></a> method and perform all the operations in this
  checkVersions method.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cell</code> - a cell with the column to match against</dd>
 <dd><code>timestamp</code> - The timestamp of the cell.</dd>
 <dd><code>type</code> - the type of the key value (Put/Delete)</dd>
 <dd><code>ignoreCount</code> - indicates if the KV needs to be excluded while counting (used during
           compactions. We only count KV's that are older than all the scanners' read points.)</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the scan query matcher match code instance</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - in case there is an internal consistency problem caused by a data
            corruption.</dd>
 </dl>
 </li>
 </ul>
 <a name="reset--">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>reset</h4>
 <pre>void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.94">reset</a>()</pre>
 <div class="block">Resets the Matcher</div>
 </li>
 </ul>
 <a name="done--">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>done</h4>
 <pre>boolean&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.100">done</a>()</pre>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd><code>true</code> when done.</dd>
 </dl>
 </li>
 </ul>
 <a name="getColumnHint--">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>getColumnHint</h4>
 <pre><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ColumnCount.html" title="class in org.apache.hadoop.hbase.regionserver.querymatcher">ColumnCount</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.113">getColumnHint</a>()</pre>
 <div class="block">Used by matcher and scan/get to get a hint of the next column
  to seek to after checkColumn() returns SKIP.  Returns the next interesting
  column we want, or NULL there is none (wildcard scanner).

  Implementations aren't required to return anything useful unless the most recent
  call was to checkColumn() and the return code was SKIP.  This is pretty implementation
  detail-y, but optimizations are like that.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>null, or a ColumnCount that we should seek to</dd>
 </dl>
 </li>
 </ul>
 <a name="getNextRowOrNextColumn-org.apache.hadoop.hbase.Cell-">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>getNextRowOrNextColumn</h4>
 <pre><a href="../../../../../../org/apache/hadoop/hbase/regionserver/querymatcher/ScanQueryMatcher.MatchCode.html" title="enum in org.apache.hadoop.hbase.regionserver.querymatcher">ScanQueryMatcher.MatchCode</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.119">getNextRowOrNextColumn</a>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell)</pre>
 <div class="block">Retrieve the MatchCode for the next row or column</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cell</code> - </dd>
 </dl>
 </li>
 </ul>
 <a name="isDone-long-">
 <!--   -->
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 <h4>isDone</h4>
 <pre>boolean&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.128">isDone</a>(long&nbsp;timestamp)</pre>
 <div class="block">Give the tracker a chance to declare it's done based on only the timestamp
  to allow an early out.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>timestamp</code> - </dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd><code>true</code> to early out based on timestamp.</dd>
 </dl>
 </li>
 </ul>
 <a name="doneWithColumn-org.apache.hadoop.hbase.Cell-">
 <!--   -->
 </a>
 <ul class="blockListLast">
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 <h4>doneWithColumn</h4>
 <pre>default&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/querymatcher/ColumnTracker.html#line.136">doneWithColumn</a>(<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>&nbsp;cell)</pre>
 <div class="block">This method is used to inform the column tracker that we are done with this column. We may get
  this information from external filters or timestamp range and we then need to indicate this
  information to tracker. It is currently implemented for ExplicitColumnTracker.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cell</code> - </dd>
 </dl>
 </li>
 </ul>
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