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<div class="title">sample.sql_in</div> </div>
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<a href="sample_8sql__in.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/* ----------------------------------------------------------------------- */</span><span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * @file sample.sql_in</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * @brief SQL functions for random sampling</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * @sa For an overview of random-sampling functions, see the module</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * description \ref grp_sample.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> */</span><span class="comment">/* ----------------------------------------------------------------------- */</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;m4_include(`SQLCommon.m4<span class="stringliteral">&#39;)</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="stringliteral"></span><span class="comment"></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment">@addtogroup grp_sample</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment">\warning &lt;em&gt; This MADlib method is still in early stage development. There may be some </span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment">issues that will be addressed in a future version. Interface and implementation</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment">is subject to change. &lt;/em&gt;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="comment">@about</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="comment">The random sampling module consists of useful utility functions for sampling</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="comment">operations. Several of these functions can be used while implementing </span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment">new algorithms.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="comment">Refer to the file for documentation on each of the utlity functions.</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="comment">@sa File sample.sql_in documenting the SQL functions.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.weighted_sample_transition_int64(</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; state MADLIB_SCHEMA.bytea8,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; value BIGINT,</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; weight DOUBLE PRECISION</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;) RETURNS MADLIB_SCHEMA.bytea8</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;AS &#39;MODULE_PATHNAME<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="stringliteral">LANGUAGE C</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="stringliteral">VOLATILE</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="stringliteral">STRICT;</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.weighted_sample_merge_int64(</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="stringliteral"> state_left MADLIB_SCHEMA.bytea8,</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="stringliteral"> state_right MADLIB_SCHEMA.bytea8</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="stringliteral">) RETURNS MADLIB_SCHEMA.bytea8</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;<span class="stringliteral">AS &#39;</span>MODULE_PATHNAME<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;<span class="stringliteral">LANGUAGE C</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;<span class="stringliteral">VOLATILE</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;<span class="stringliteral">STRICT;</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.weighted_sample_final_int64(</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;<span class="stringliteral"> state MADLIB_SCHEMA.bytea8</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;<span class="stringliteral">) RETURNS BIGINT</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;<span class="stringliteral">AS &#39;</span>MODULE_PATHNAME<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;<span class="stringliteral">LANGUAGE C</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;<span class="stringliteral">IMMUTABLE</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;<span class="stringliteral">STRICT;</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="stringliteral"></span><span class="comment"></span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="comment"> * @brief Sample a single row according to weights</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="comment"> * @param value Value of row. Uniqueness is not enforced. If a value occurs</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;<span class="comment"> * multiple times, the probability of sampling this value is proportional to</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="comment"> * the sum of its weights.</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="comment"> * @param weight Weight for row. A negative value here is treated has zero</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;<span class="comment"> * weight.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;<span class="comment"> * @return \c identifier of the selected row. The probability of sampling any</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;<span class="comment"> * particular row &lt;tt&gt;(value, weight)&lt;/tt&gt; is</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;<span class="comment"> * &lt;tt&gt;weight/SUM(weight)&lt;/tt&gt;.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;CREATE AGGREGATE MADLIB_SCHEMA.weighted_sample(</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; /*+ value */ BIGINT,</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; /*+ weight */ DOUBLE PRECISION) (</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; SFUNC=MADLIB_SCHEMA.weighted_sample_transition_int64,</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; STYPE=MADLIB_SCHEMA.bytea8,</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; FINALFUNC=MADLIB_SCHEMA.weighted_sample_final_int64,</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; m4_ifdef(`__GREENPLUM__&#39;,`prefunc=MADLIB_SCHEMA.weighted_sample_merge_int64,<span class="stringliteral">&#39;)</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;<span class="stringliteral"> INITCOND=&#39;</span><span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;<span class="stringliteral">);</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.weighted_sample_transition_vector(</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;<span class="stringliteral"> state MADLIB_SCHEMA.bytea8,</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="stringliteral"> value DOUBLE PRECISION[],</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;<span class="stringliteral"> weight DOUBLE PRECISION</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;<span class="stringliteral">) RETURNS MADLIB_SCHEMA.bytea8</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;<span class="stringliteral">AS &#39;</span>MODULE_PATHNAME<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="stringliteral">LANGUAGE C</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="stringliteral">VOLATILE</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;<span class="stringliteral">STRICT;</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00093"></a><span class="lineno"><a class="code" href="sample_8sql__in.html#aa0da3745c7eaecfbe4d21e2abac14906"> 93</a></span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.weighted_sample_merge_vector(</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;<span class="stringliteral"> state_left MADLIB_SCHEMA.bytea8,</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;<span class="stringliteral"> state_right MADLIB_SCHEMA.bytea8</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;<span class="stringliteral">) RETURNS MADLIB_SCHEMA.bytea8</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;<span class="stringliteral">AS &#39;</span>MODULE_PATHNAME<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160;<span class="stringliteral">LANGUAGE C</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;<span class="stringliteral">VOLATILE</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;<span class="stringliteral">STRICT;</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.weighted_sample_final_vector(</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;<span class="stringliteral"> state MADLIB_SCHEMA.bytea8</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;<span class="stringliteral">) RETURNS DOUBLE PRECISION[]</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;<span class="stringliteral">AS &#39;</span>MODULE_PATHNAME<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;<span class="stringliteral">LANGUAGE C</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;<span class="stringliteral">IMMUTABLE</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;<span class="stringliteral">STRICT;</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;<span class="stringliteral">CREATE AGGREGATE MADLIB_SCHEMA.weighted_sample(</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;<span class="stringliteral"> /*+ value */ DOUBLE PRECISION[],</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;<span class="stringliteral"> /*+ weight */ DOUBLE PRECISION) (</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;<span class="stringliteral"> SFUNC=MADLIB_SCHEMA.weighted_sample_transition_vector,</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;<span class="stringliteral"> STYPE=MADLIB_SCHEMA.bytea8,</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;<span class="stringliteral"> FINALFUNC=MADLIB_SCHEMA.weighted_sample_final_vector,</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;<span class="stringliteral"> m4_ifdef(`__GREENPLUM__&#39;</span>,`prefunc=MADLIB_SCHEMA.weighted_sample_merge_vector,<span class="stringliteral">&#39;)</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;<span class="stringliteral"> INITCOND=&#39;</span><span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;<span class="stringliteral">);</span></div>
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