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<p><code>#include &lt;<a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>&gt;</code></p>
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Collaboration diagram for impala::BufferedTupleStream::RowIdx:</div>
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<tr class="memitem:a2096ee0339acea32229f87193c97524c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classuint64__t.html">uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#a2096ee0339acea32229f87193c97524c">block</a> () const </td></tr>
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<tr class="memitem:a431215848544ca0af04357ff722c5f80"><td class="memItemLeft" align="right" valign="top">std::string&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#a431215848544ca0af04357ff722c5f80">DebugString</a> () const </td></tr>
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Public Attributes</h2></td></tr>
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Static Public Attributes</h2></td></tr>
<tr class="memitem:aa78a147b1cd7d4364fcbebcc261cae84"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="classuint64__t.html">uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#aa78a147b1cd7d4364fcbebcc261cae84">BLOCK_MASK</a> = 0xFFFF</td></tr>
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<tr class="memitem:a4fcb7ad8bfd26184ba80ff7ced27d5a5"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="classuint64__t.html">uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#a4fcb7ad8bfd26184ba80ff7ced27d5a5">BLOCK_SHIFT</a> = 0</td></tr>
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<tr class="memitem:a3cb5b0f579f7dc19c7076e34c97b0b9b"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="classuint64__t.html">uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#a3cb5b0f579f7dc19c7076e34c97b0b9b">OFFSET_MASK</a> = 0xFFFFFF0000</td></tr>
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<tr class="memitem:ae4195c988c503e4de241e32036ca1b65"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="classuint64__t.html">uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#ae4195c988c503e4de241e32036ca1b65">OFFSET_SHIFT</a> = 16</td></tr>
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<tr class="memitem:a5a31e51ff14da66121477a191964703a"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="classuint64__t.html">uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#a5a31e51ff14da66121477a191964703a">IDX_MASK</a> = 0xFFFFFF0000000000</td></tr>
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<tr class="memitem:a0ec2ebd3590dcfdcfadd34d534a0261e"><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="classuint64__t.html">uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structimpala_1_1BufferedTupleStream_1_1RowIdx.html#a0ec2ebd3590dcfdcfadd34d534a0261e">IDX_SHIFT</a> = 40</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Ordinal index into the stream to retrieve a row in O(1) time. This index can only be used if the stream is pinned. To read a row from a stream we need three pieces of information that we squeeze in 64 bits:</p>
<ul>
<li>The index of the block. The block id is stored in 16 bits. We can have up to 64K blocks per tuple stream. With 8MB blocks that is 512GB per stream.</li>
<li>The offset of the start of the row (data) within the block. Since blocks are 8MB we use 24 bits for the offsets. (In theory we could use 23 bits.)</li>
<li>The idx of the row in the block. We need this for retrieving the null indicators. We use 24 bits for this index as well. </li>
</ul>
<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00121">121</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
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<td class="memname"><a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::block </td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00129">129</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>References <a class="el" href="buffered-tuple-stream_8h_source.html#l00122">BLOCK_MASK</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00154">data</a>.</p>
<p>Referenced by <a class="el" href="hash-table_8cc_source.html#l00373">impala::HashTable::DebugStringTuple()</a>, and <a class="el" href="buffered-tuple-stream_8inline_8h_source.html#l00049">impala::BufferedTupleStream::GetTupleRow()</a>.</p>
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<td class="memname">string BufferedTupleStream::RowIdx::DebugString </td>
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<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8cc_source.html#l00037">37</a> of file <a class="el" href="buffered-tuple-stream_8cc_source.html">buffered-tuple-stream.cc</a>.</p>
<p>References <a class="el" href="gen__ir__descriptions_8py_source.html#l00215">gen_ir_descriptions::idx</a>, and <a class="el" href="partitioning-throughput-test_8cc_source.html#l00037">offset</a>.</p>
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<td class="memname"><a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::idx </td>
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<td> const</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00137">137</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>References <a class="el" href="buffered-tuple-stream_8h_source.html#l00154">data</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00126">IDX_MASK</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00127">IDX_SHIFT</a>.</p>
<p>Referenced by <a class="el" href="hash-table_8cc_source.html#l00373">impala::HashTable::DebugStringTuple()</a>, and <a class="el" href="buffered-tuple-stream_8inline_8h_source.html#l00049">impala::BufferedTupleStream::GetTupleRow()</a>.</p>
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<td class="memname"><a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::offset </td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00133">133</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>References <a class="el" href="buffered-tuple-stream_8h_source.html#l00154">data</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00124">OFFSET_MASK</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00125">OFFSET_SHIFT</a>.</p>
<p>Referenced by <a class="el" href="hash-table_8cc_source.html#l00373">impala::HashTable::DebugStringTuple()</a>, and <a class="el" href="buffered-tuple-stream_8inline_8h_source.html#l00049">impala::BufferedTupleStream::GetTupleRow()</a>.</p>
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<td class="memname"><a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::set </td>
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<td>)</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00141">141</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>References <a class="el" href="buffered-tuple-stream_8h_source.html#l00122">BLOCK_MASK</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00154">data</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00126">IDX_MASK</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00127">IDX_SHIFT</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00124">OFFSET_MASK</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00125">OFFSET_SHIFT</a>.</p>
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<td class="memname">const <a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::BLOCK_MASK = 0xFFFF</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00122">122</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>Referenced by <a class="el" href="buffered-tuple-stream_8h_source.html#l00129">block()</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00141">set()</a>.</p>
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<td class="memname">const <a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::BLOCK_SHIFT = 0</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00123">123</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
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<td class="memname"><a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::data</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00154">154</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>Referenced by <a class="el" href="buffered-tuple-stream_8h_source.html#l00129">block()</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00137">idx()</a>, <a class="el" href="buffered-tuple-stream_8h_source.html#l00133">offset()</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00141">set()</a>.</p>
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<td class="memname">const <a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::IDX_MASK = 0xFFFFFF0000000000</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00126">126</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>Referenced by <a class="el" href="buffered-tuple-stream_8h_source.html#l00137">idx()</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00141">set()</a>.</p>
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<td class="memname">const <a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::IDX_SHIFT = 40</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00127">127</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>Referenced by <a class="el" href="buffered-tuple-stream_8h_source.html#l00137">idx()</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00141">set()</a>.</p>
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<td class="memname">const <a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::OFFSET_MASK = 0xFFFFFF0000</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00124">124</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>Referenced by <a class="el" href="buffered-tuple-stream_8h_source.html#l00133">offset()</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00141">set()</a>.</p>
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<td class="memname">const <a class="el" href="classuint64__t.html">uint64_t</a> impala::BufferedTupleStream::RowIdx::OFFSET_SHIFT = 16</td>
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<p>Definition at line <a class="el" href="buffered-tuple-stream_8h_source.html#l00125">125</a> of file <a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a>.</p>
<p>Referenced by <a class="el" href="buffered-tuple-stream_8h_source.html#l00133">offset()</a>, and <a class="el" href="buffered-tuple-stream_8h_source.html#l00141">set()</a>.</p>
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<hr/>The documentation for this struct was generated from the following files:<ul>
<li>be/src/runtime/<a class="el" href="buffered-tuple-stream_8h_source.html">buffered-tuple-stream.h</a></li>
<li>be/src/runtime/<a class="el" href="buffered-tuple-stream_8cc_source.html">buffered-tuple-stream.cc</a></li>
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