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| <p>SQL functions for random sampling. |
| <a href="#details">More...</a></p> |
| <table class="memberdecls"> |
| <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> |
| Functions</h2></td></tr> |
| <tr class="memitem:af933c6e9d6623c62a671dc74e5bd9d51"><td class="memItemLeft" align="right" valign="top">bytea8 </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#af933c6e9d6623c62a671dc74e5bd9d51">weighted_sample_transition_int64</a> (bytea8 state, bigint value, float8 weight)</td></tr> |
| <tr class="separator:af933c6e9d6623c62a671dc74e5bd9d51"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:aa066d40345787e00819963f095f40998"><td class="memItemLeft" align="right" valign="top">bytea8 </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#aa066d40345787e00819963f095f40998">weighted_sample_merge_int64</a> (bytea8 state_left, bytea8 state_right)</td></tr> |
| <tr class="separator:aa066d40345787e00819963f095f40998"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a5c2226995c3ef02cb2320b9829bad5eb"><td class="memItemLeft" align="right" valign="top">bigint </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#a5c2226995c3ef02cb2320b9829bad5eb">weighted_sample_final_int64</a> (bytea8 state)</td></tr> |
| <tr class="separator:a5c2226995c3ef02cb2320b9829bad5eb"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:aa0da3745c7eaecfbe4d21e2abac14906"><td class="memItemLeft" align="right" valign="top">aggregate bigint </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#aa0da3745c7eaecfbe4d21e2abac14906">weighted_sample</a> (bigint value, float8 weight)</td></tr> |
| <tr class="memdesc:aa0da3745c7eaecfbe4d21e2abac14906"><td class="mdescLeft"> </td><td class="mdescRight">Sample a single row according to weights. <a href="#aa0da3745c7eaecfbe4d21e2abac14906">More...</a><br/></td></tr> |
| <tr class="separator:aa0da3745c7eaecfbe4d21e2abac14906"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ae7ad8a80a8c2508cc54cf496934017c2"><td class="memItemLeft" align="right" valign="top">bytea8 </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#ae7ad8a80a8c2508cc54cf496934017c2">weighted_sample_transition_vector</a> (bytea8 state, float8[] value, float8 weight)</td></tr> |
| <tr class="separator:ae7ad8a80a8c2508cc54cf496934017c2"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:ac5d00ff9e30dcae8a1b6b8450df3e95e"><td class="memItemLeft" align="right" valign="top">bytea8 </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#ac5d00ff9e30dcae8a1b6b8450df3e95e">weighted_sample_merge_vector</a> (bytea8 state_left, bytea8 state_right)</td></tr> |
| <tr class="separator:ac5d00ff9e30dcae8a1b6b8450df3e95e"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a8b2b3bb57b01f47bafe44bea73f39f78"><td class="memItemLeft" align="right" valign="top">float8[] </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#a8b2b3bb57b01f47bafe44bea73f39f78">weighted_sample_final_vector</a> (bytea8 state)</td></tr> |
| <tr class="separator:a8b2b3bb57b01f47bafe44bea73f39f78"><td class="memSeparator" colspan="2"> </td></tr> |
| <tr class="memitem:a5d5dba4ce1e4d1394f9381cf55e22f60"><td class="memItemLeft" align="right" valign="top">aggregate float8[] </td><td class="memItemRight" valign="bottom"><a class="el" href="sample_8sql__in.html#a5d5dba4ce1e4d1394f9381cf55e22f60">weighted_sample</a> (float8[] value, float8 weight)</td></tr> |
| <tr class="separator:a5d5dba4ce1e4d1394f9381cf55e22f60"><td class="memSeparator" colspan="2"> </td></tr> |
| </table> |
| <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> |
| <div class="textblock"><dl class="section see"><dt>See Also</dt><dd>For an overview of random-sampling functions, see the module description <a class="el" href="group__grp__sample.html">Random Sampling</a>. </dd></dl> |
| </div><h2 class="groupheader">Function Documentation</h2> |
| <a class="anchor" id="aa0da3745c7eaecfbe4d21e2abac14906"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">aggregate bigint weighted_sample </td> |
| <td>(</td> |
| <td class="paramtype">bigint </td> |
| <td class="paramname"><em>value</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8 </td> |
| <td class="paramname"><em>weight</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">value</td><td>Value of row. Uniqueness is not enforced. If a value occurs multiple times, the probability of sampling this value is proportional to the sum of its weights. </td></tr> |
| <tr><td class="paramname">weight</td><td>Weight for row. A negative value here is treated has zero weight. </td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="section return"><dt>Returns</dt><dd><code>identifier</code> of the selected row. The probability of sampling any particular row <code>(value, weight)</code> is <code>weight/SUM(weight)</code>. </dd></dl> |
| |
| </div> |
| </div> |
| <a class="anchor" id="a5d5dba4ce1e4d1394f9381cf55e22f60"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">aggregate float8 [] weighted_sample </td> |
| <td>(</td> |
| <td class="paramtype">float8[] </td> |
| <td class="paramname"><em>value</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8 </td> |
| <td class="paramname"><em>weight</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| </div> |
| </div> |
| <a class="anchor" id="a5c2226995c3ef02cb2320b9829bad5eb"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">bigint weighted_sample_final_int64 </td> |
| <td>(</td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state</em>)</td><td></td> |
| <td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| </div> |
| </div> |
| <a class="anchor" id="a8b2b3bb57b01f47bafe44bea73f39f78"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">float8 [] weighted_sample_final_vector </td> |
| <td>(</td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state</em>)</td><td></td> |
| <td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| </div> |
| </div> |
| <a class="anchor" id="aa066d40345787e00819963f095f40998"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">bytea8 weighted_sample_merge_int64 </td> |
| <td>(</td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state_left</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state_right</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| </div> |
| </div> |
| <a class="anchor" id="ac5d00ff9e30dcae8a1b6b8450df3e95e"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">bytea8 weighted_sample_merge_vector </td> |
| <td>(</td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state_left</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state_right</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| </div> |
| </div> |
| <a class="anchor" id="af933c6e9d6623c62a671dc74e5bd9d51"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">bytea8 weighted_sample_transition_int64 </td> |
| <td>(</td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">bigint </td> |
| <td class="paramname"><em>value</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8 </td> |
| <td class="paramname"><em>weight</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div><div class="memdoc"> |
| |
| </div> |
| </div> |
| <a class="anchor" id="ae7ad8a80a8c2508cc54cf496934017c2"></a> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">bytea8 weighted_sample_transition_vector </td> |
| <td>(</td> |
| <td class="paramtype">bytea8 </td> |
| <td class="paramname"><em>state</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8[] </td> |
| <td class="paramname"><em>value</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8 </td> |
| <td class="paramname"><em>weight</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
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