pan class="paramLabel">Parameters:</span></dt>
<dd><code>colStart</code> - the start index of the sub-range (1-based, inclusive)</dd>
<dd><code>colEnd</code> - the end index of the sub-range (1-based, exclusive)</dd>
<dd><code>dummycodedOffset</code> - the offset of dummycoded segments before colStart</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a decoder of the same type, just for the sub-range</dd>
</dl>
</li>
</ul>
<a id="updateIndexRanges(long[],long[])">
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</a>
<ul class="blockL