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<div class="title">utilities.sql_in</div> </div>
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<a href="utilities_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 utilities.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 carrying out routine tasks</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 a brief overview of utility functions, see the</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * module description \ref grp_utilities.</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;) --&#39;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;m4_changequote(&lt;!,!&gt;)</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">/**</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment">@addtogroup grp_utilities</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</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="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment">issues that will be addressed in a future version. Interface and implementation</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment">is subject to change. &lt;/em&gt;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="comment">@about</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="comment">The utility module consists of useful utility functions to assist data </span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment">scientists in using the product. Several of these functions can be used</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment">while implementing new algorithms.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="comment">Refer to the file for documentation on each of the utlity functions.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="comment"></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;<span class="comment">@sa File utilities.sql_in documenting the SQL functions.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="comment"> * @brief Return MADlib build information.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="comment"> * @returns Summary of MADlib build information, consisting of MADlib version,</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="comment"> * git revision, cmake configuration time, build type, build system,</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="comment"> * C compiler, and C++ compiler</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.version()</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;RETURNS TEXT</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;LANGUAGE sql</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;IMMUTABLE</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;AS $$</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; SELECT (</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="stringliteral">&#39;MADlib version: __MADLIB_VERSION__, &#39;</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="stringliteral">&#39;git revision: __MADLIB_GIT_REVISION__, &#39;</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="stringliteral">&#39;cmake configuration time: __MADLIB_BUILD_TIME__, &#39;</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="stringliteral">&#39;build type: __MADLIB_BUILD_TYPE__, &#39;</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="stringliteral">&#39;build system: __MADLIB_BUILD_SYSTEM__, &#39;</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="stringliteral">&#39;C compiler: __MADLIB_C_COMPILER__, &#39;</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="stringliteral">&#39;C++ compiler: __MADLIB_CXX_COMPILER__&#39;</span>)::TEXT</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;$$;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="comment"> * @brief Raise an exception if the given condition is not satisfied.</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.assert(condition BOOLEAN, msg VARCHAR)</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;RETURNS VOID</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;LANGUAGE plpgsql</div>
<div class="line"><a name="l00064"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#a9ce7ffa76acc8a0638e9bc48be99f36a"> 64</a></span>&#160;IMMUTABLE</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;AS $$</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;BEGIN</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; IF NOT condition THEN</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; RAISE EXCEPTION <span class="stringliteral">&#39;Failed assertion: %&#39;</span>, msg;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; END IF;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;END</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;$$;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;------------------------------------------------------------------------</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="comment"> * @brief Compute the relative error of an approximate value</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.relative_error(</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; approx DOUBLE PRECISION,</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; value DOUBLE PRECISION</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;) RETURNS DOUBLE PRECISION</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;LANGUAGE sql</div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#a76cfdbed8a6782f37f50710d855434bd"> 83</a></span>&#160;AS $$</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; SELECT abs(($1 - $2)/$2)</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;$$;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;------------------------------------------------------------------------</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="comment"> * @brief Compute the relative error (w.r.t. the 2-norm) of an apprixmate vector</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.relative_error(</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; approx DOUBLE PRECISION[],</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; value DOUBLE PRECISION[]</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;) RETURNS DOUBLE PRECISION</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;LANGUAGE sql</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;AS $$</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; SELECT MADLIB_SCHEMA.dist_norm2($1, $2) / MADLIB_SCHEMA.norm2($2)</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;$$;</div>
<div class="line"><a name="l00100"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#a4d49e00b4dd6059f61ffb9fdc0a696f7"> 100</a></span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;------------------------------------------------------------------------</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;<span class="comment"> * @brief Check if a SQL statement raises an error</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;<span class="comment"> * @param sql The SQL statement</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;<span class="comment"> * @returns \c TRUE if an exception is raised while executing \c sql, \c FALSE</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;<span class="comment"> * otherwise.</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.check_if_raises_error(</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; sql TEXT</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;) RETURNS BOOLEAN</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;LANGUAGE plpgsql</div>
<div class="line"><a name="l00114"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#a26a54368fbf2460323cacf95db76fd2f"> 114</a></span>&#160;AS $$</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;BEGIN</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; EXECUTE sql;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; RETURN FALSE;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;EXCEPTION</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; WHEN OTHERS THEN</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; RETURN TRUE;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;END;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160;$$;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;------------------------------------------------------------------------</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160;<span class="comment"> * @brief Check if a column exists in a table </span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;<span class="comment"> * @param source_table Source table</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;<span class="comment"> * @param column_name Column name in the table</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;<span class="comment"> * @returns \c TRUE if it exsists and FALSE if not </span></div>
<div class="line"><a name="l00132"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#aa90ffaebb43a5cbcb5c48281cbadd3b0"> 132</a></span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160;CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.check_if_col_exists(</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; source_table TEXT,</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; column_name TEXT</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160;) </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;RETURNS BOOLEAN AS $$</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;DECLARE</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; sql TEXT;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; input_table_name VARCHAR[];</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; actual_table_name VARCHAR;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; schema_name VARCHAR;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160;BEGIN</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; input_table_name = regexp_split_to_array(source_table, E<span class="stringliteral">&#39;\\.&#39;</span>);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; IF array_upper(input_table_name, 1) = 1 THEN</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; actual_table_name = input_table_name[1];</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; schema_name := current_schema();</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; ELSIF array_upper(input_table_name, 1) = 2 THEN</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; actual_table_name = input_table_name[2];</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; schema_name = input_table_name[1];</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; ELSE</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; RAISE EXCEPTION <span class="stringliteral">&#39;Incorrect input source table name provided&#39;</span>;</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; END IF;</div>
<div class="line"><a name="l00155"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#ac1f509bd94c6309b59eb4d479fb2a470"> 155</a></span>&#160; sql := <span class="stringliteral">&#39;SELECT MADLIB_SCHEMA.assert(count( column_name )&gt;0, &#39;</span><span class="stringliteral">&#39;Error&#39;</span><span class="stringliteral">&#39;) FROM information_schema.columns WHERE table_schema = &#39;</span><span class="stringliteral">&#39;&#39;</span> || schema_name || <span class="charliteral">&#39;&#39;&#39;</span> AND table_name = <span class="charliteral">&#39;&#39;&#39;</span> || actual_table_name || <span class="charliteral">&#39;&#39;&#39;</span> AND column_name= <span class="charliteral">&#39;&#39;&#39;</span> || column_name || <span class="charliteral">&#39;&#39;&#39;</span><span class="stringliteral">&#39;;</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160;<span class="stringliteral"> raise notice &#39;</span>%<span class="stringliteral">&#39;, sql;</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160;<span class="stringliteral"> RETURN NOT MADLIB_SCHEMA.check_if_raises_error(sql);</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160;<span class="stringliteral">END;</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160;<span class="stringliteral">$$ LANGUAGE plpgsql VOLATILE;</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160;<span class="stringliteral">------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160;<span class="stringliteral"></span><span class="comment"></span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;<span class="comment"> * @brief Check if a floating-point number is NaN (not a number)</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160;<span class="comment"> * This function exists for portability. Some DBMSs like PostgreSQL treat</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160;<span class="comment"> * floating-point numbers as fully ordered -- contrary to IEEE 754. (See, e.g.,</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;<span class="comment"> * the &lt;a href=</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160;<span class="comment"> * &quot;http://www.postgresql.org/docs/current/static/datatype-numeric.html#DATATYPE-FLOAT&quot;</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;<span class="comment"> * &gt;PostgreSQL documentation&lt;/a&gt;. For portability, MADlib code should not make</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160;<span class="comment"> * use of such &quot;features&quot; directly, but only use isnan() instead.</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;<span class="comment"> * @param number</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;<span class="comment"> * @returns \c TRUE if \c number is \c NaN, \c FALSE otherwise</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.isnan(</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; number DOUBLE PRECISION</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;) RETURNS BOOLEAN</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160;LANGUAGE sql</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;AS $$</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; SELECT $1 = &#39;NaN<span class="stringliteral">&#39;::DOUBLE PRECISION;</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;<span class="stringliteral">$$;</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;<span class="stringliteral">------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160;<span class="stringliteral"></span><span class="comment"></span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;<span class="comment"> * @brief Create the temporary schema if it does not exist yet</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.create_schema_pg_temp()</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160;RETURNS VOID</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;LANGUAGE plpgsql</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160;VOLATILE</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;AS $$</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160;BEGIN</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; -- pg_my_temp_schema() is a built-in function</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160; IF pg_my_temp_schema() = 0 THEN</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; -- The pg_temp schema does not exist, yet. Creating a temporary table</div>
<div class="line"><a name="l00198"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#a48bed63cab78a5446fa4c122eaae3a40"> 198</a></span>&#160; -- will create it. Note: There is *no* race condition here, because</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; -- every session has its own temp schema.</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; EXECUTE &#39;CREATE TEMPORARY TABLE _madlib_temp_table AS SELECT 1;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; DROP TABLE pg_temp._madlib_temp_table CASCADE;<span class="stringliteral">&#39;;</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160;<span class="stringliteral"> END IF;</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160;<span class="stringliteral">END;</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160;<span class="stringliteral">$$;</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160;<span class="stringliteral">------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160;<span class="stringliteral"></span><span class="comment"></span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160;<span class="comment"> * @brief Create volatile noop function</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#a56501b6f9fabe65d7a6a6beb70a0e000"> 211</a></span>&#160;<span class="comment"> * The only use of this function is as an optimization fence when used in the</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160;<span class="comment"> * SELECT list of a query. See, e.g.,</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160;<span class="comment"> * http://archives.postgresql.org/pgsql-sql/2012-07/msg00030.php</span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160;CREATE FUNCTION MADLIB_SCHEMA.noop()</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160;RETURNS VOID</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160;VOLATILE</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160;LANGUAGE c</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160;AS &#39;MODULE_PATHNAME<span class="stringliteral">&#39;;</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160;<span class="stringliteral">------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160;<span class="stringliteral">/*</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160;<span class="stringliteral"> * Create type bytea8 with 8-byte alignment.</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160;<span class="stringliteral"> */</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160;<span class="stringliteral">CREATE TYPE MADLIB_SCHEMA.bytea8;</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.bytea8in(cstring)</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160;<span class="stringliteral">RETURNS MADLIB_SCHEMA.bytea8 AS &#39;</span>byteain<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160;<span class="stringliteral">LANGUAGE internal IMMUTABLE STRICT;</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.bytea8out(MADLIB_SCHEMA.bytea8)</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160;<span class="stringliteral">RETURNS cstring AS &#39;</span>byteaout<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160;<span class="stringliteral">LANGUAGE internal IMMUTABLE STRICT;</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.bytea8recv(internal)</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"><a class="code" href="utilities_8sql__in.html#ab194d6a1222672c314ea39b78aad8fd0"> 237</a></span>&#160;<span class="stringliteral">RETURNS MADLIB_SCHEMA.bytea8 AS &#39;</span>bytearecv<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160;<span class="stringliteral">LANGUAGE internal IMMUTABLE STRICT;</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160;<span class="stringliteral">CREATE FUNCTION MADLIB_SCHEMA.bytea8send(MADLIB_SCHEMA.bytea8)</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160;<span class="stringliteral">RETURNS bytea AS &#39;</span>byteasend<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160;<span class="stringliteral">LANGUAGE internal IMMUTABLE STRICT;</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>&#160;<span class="stringliteral">CREATE TYPE MADLIB_SCHEMA.bytea8(</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>&#160;<span class="stringliteral"> INPUT = MADLIB_SCHEMA.bytea8in,</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>&#160;<span class="stringliteral"> OUTPUT = MADLIB_SCHEMA.bytea8out,</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>&#160;<span class="stringliteral"> RECEIVE = MADLIB_SCHEMA.bytea8recv,</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160;<span class="stringliteral"> SEND = MADLIB_SCHEMA.bytea8send,</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160;<span class="stringliteral"> ALIGNMENT = double</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>&#160;<span class="stringliteral">);</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>&#160;<span class="stringliteral"></span><span class="comment"></span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>&#160;<span class="comment"> * @brief Get all column names except dependent variable</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>&#160;<span class="comment">**/</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>&#160;CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.__internal_get_col_names_except_dep_variable(</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>&#160; source_table VARCHAR -- name of input table</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>&#160; , dependent_varname VARCHAR -- name of dependent variable</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>&#160;)</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>&#160;RETURNS VARCHAR AS $$</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>&#160;DECLARE</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>&#160;col_names VARCHAR[];</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>&#160;BEGIN</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>&#160; EXECUTE &#39;SELECT ARRAY(SELECT DISTINCT column_name::varchar from <span class="stringliteral">&#39; || </span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>&#160;<span class="stringliteral"> &#39;</span> information_schema.columns WHERE <span class="stringliteral">&#39; || </span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>&#160;<span class="stringliteral"> &#39;</span>column_name NOT LIKE <span class="charliteral">&#39;&#39;&#39;</span> || dependent_varname || <span class="charliteral">&#39;&#39;&#39;</span><span class="stringliteral">&#39; || </span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>&#160;<span class="stringliteral"> &#39;</span>AND table_name LIKE <span class="charliteral">&#39;&#39;&#39;</span> || source_table || <span class="charliteral">&#39;&#39;&#39;</span>)<span class="stringliteral">&#39;</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>&#160;<span class="stringliteral"> INTO col_names;</span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>&#160;<span class="stringliteral"> RETURN &#39;</span>ARRAY[<span class="stringliteral">&#39; || array_to_string(col_names, &#39;</span>,<span class="stringliteral">&#39;) || &#39;</span>]<span class="stringliteral">&#39;;</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>&#160;<span class="stringliteral">END;</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>&#160;<span class="stringliteral">$$ LANGUAGE plpgsql VOLATILE;</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>&#160;<span class="stringliteral">------------------------------------------------------------------------</span><span class="comment"></span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>&#160;<span class="comment"> * @brief Generate random remporary names for temp table and other names</span></div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>&#160;CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.__unique_string ()</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>&#160;RETURNS VARCHAR AS $$</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>&#160;PythonFunction(utilities, utilities, __unique_string)</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>&#160;$$ LANGUAGE plpythonu;</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>&#160;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>&#160;------------------------------------------------------------------------<span class="comment"></span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>&#160;<span class="comment"> * @brief Takes a string of comma separated values and puts it into an array</span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>&#160;CREATE OR REPLACE FUNCTION MADLIB_SCHEMA._string_to_array (</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>&#160; s VARCHAR</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>&#160;)</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>&#160;RETURNS VARCHAR[] AS $$</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>&#160;PythonFunction(utilities, utilities, _string_to_sql_array)</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>&#160;$$ LANGUAGE plpythonu;</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>&#160;</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>&#160;------------------------------------------------------------------------<span class="comment"></span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>&#160;<span class="comment"> * @brief Cast boolean into text</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>&#160;CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.bool_to_text (BOOLEAN)</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>&#160;RETURNS TEXT</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>&#160;STRICT</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>&#160;LANGUAGE SQL AS &#39;</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>&#160; SELECT CASE</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>&#160; WHEN $1 THEN <span class="stringliteral">&#39;&#39;</span>t<span class="stringliteral">&#39;&#39;</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>&#160; ELSE <span class="stringliteral">&#39;&#39;</span>f<span class="stringliteral">&#39;&#39;</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>&#160; END;</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>&#160;<span class="stringliteral">&#39;;</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>&#160;<span class="stringliteral">m4_ifdef(`__GREENPLUM__&#39;</span>, `</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>&#160;CREATE CAST (BOOLEAN AS TEXT)</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>&#160; WITH FUNCTION MADLIB_SCHEMA.bool_to_text(BOOLEAN)</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>&#160; AS ASSIGNMENT;</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>&#160;<span class="stringliteral">&#39;)</span></div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>&#160;<span class="stringliteral">------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>&#160;<span class="stringliteral">/*</span></div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>&#160;<span class="stringliteral"> * An array_agg() function is defined in module array_ops (to compatibility with</span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>&#160;<span class="stringliteral"> * GP 4.0.</span></div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>&#160;<span class="stringliteral"> */</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>&#160;<span class="stringliteral"></span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>&#160;<span class="stringliteral">m4_changequote(&lt;!`!&gt;,&lt;!&#39;</span>!&gt;)</div>
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