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|  <span id="projectnumber">0.6</span> <span style="font-size:10pt; font-style:italic"><a href="../latest/./utilities_8sql__in_source.html"> A newer version is available</a></span> |
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| <a href="utilities_8sql__in.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* ----------------------------------------------------------------------- */</span><span class="comment">/**</span> |
| <a name="l00002"></a>00002 <span class="comment"> *</span> |
| <a name="l00003"></a>00003 <span class="comment"> * @file utilities.sql_in</span> |
| <a name="l00004"></a>00004 <span class="comment"> *</span> |
| <a name="l00005"></a>00005 <span class="comment"> * @brief SQL functions for carrying out routine tasks</span> |
| <a name="l00006"></a>00006 <span class="comment"> *</span> |
| <a name="l00007"></a>00007 <span class="comment"> * @sa For a brief overview of utility functions, see the</span> |
| <a name="l00008"></a>00008 <span class="comment"> * module description \ref grp_utilities.</span> |
| <a name="l00009"></a>00009 <span class="comment"> *</span> |
| <a name="l00010"></a>00010 <span class="comment"> */</span><span class="comment">/* ----------------------------------------------------------------------- */</span> |
| <a name="l00011"></a>00011 |
| <a name="l00012"></a>00012 m4_include(`SQLCommon.m4<span class="stringliteral">') --'</span> |
| <a name="l00013"></a>00013 m4_changequote(<!,!>) |
| <a name="l00014"></a>00014 <span class="comment"></span> |
| <a name="l00015"></a>00015 <span class="comment">/**</span> |
| <a name="l00016"></a>00016 <span class="comment">@addtogroup grp_utilities</span> |
| <a name="l00017"></a>00017 <span class="comment"></span> |
| <a name="l00018"></a>00018 <span class="comment">@about</span> |
| <a name="l00019"></a>00019 <span class="comment"></span> |
| <a name="l00020"></a>00020 <span class="comment">The utilty module provides functions for routine tasks that need no further</span> |
| <a name="l00021"></a>00021 <span class="comment">explanation.</span> |
| <a name="l00022"></a>00022 <span class="comment"></span> |
| <a name="l00023"></a>00023 <span class="comment">@sa File utilities.sql_in documenting the SQL functions.</span> |
| <a name="l00024"></a>00024 <span class="comment">*/</span> |
| <a name="l00025"></a>00025 <span class="comment"></span> |
| <a name="l00026"></a>00026 <span class="comment">/**</span> |
| <a name="l00027"></a>00027 <span class="comment"> * @brief Return MADlib build information.</span> |
| <a name="l00028"></a>00028 <span class="comment"> *</span> |
| <a name="l00029"></a>00029 <span class="comment"> * @returns Summary of MADlib build information, consisting of MADlib version,</span> |
| <a name="l00030"></a>00030 <span class="comment"> * git revision, cmake configuration time, build type, build system,</span> |
| <a name="l00031"></a>00031 <span class="comment"> * C compiler, and C++ compiler</span> |
| <a name="l00032"></a>00032 <span class="comment"> */</span> |
| <a name="l00033"></a>00033 CREATE FUNCTION MADLIB_SCHEMA.version() |
| <a name="l00034"></a>00034 RETURNS TEXT |
| <a name="l00035"></a>00035 LANGUAGE sql |
| <a name="l00036"></a>00036 IMMUTABLE |
| <a name="l00037"></a>00037 AS $$ |
| <a name="l00038"></a>00038 SELECT ( |
| <a name="l00039"></a>00039 <span class="stringliteral">'MADlib version: __MADLIB_VERSION__, '</span> |
| <a name="l00040"></a>00040 <span class="stringliteral">'git revision: __MADLIB_GIT_REVISION__, '</span> |
| <a name="l00041"></a>00041 <span class="stringliteral">'cmake configuration time: __MADLIB_BUILD_TIME__, '</span> |
| <a name="l00042"></a>00042 <span class="stringliteral">'build type: __MADLIB_BUILD_TYPE__, '</span> |
| <a name="l00043"></a>00043 <span class="stringliteral">'build system: __MADLIB_BUILD_SYSTEM__, '</span> |
| <a name="l00044"></a>00044 <span class="stringliteral">'C compiler: __MADLIB_C_COMPILER__, '</span> |
| <a name="l00045"></a>00045 <span class="stringliteral">'C++ compiler: __MADLIB_CXX_COMPILER__'</span>)::TEXT |
| <a name="l00046"></a>00046 $$; |
| <a name="l00047"></a>00047 |
| <a name="l00048"></a>00048 <span class="comment"></span> |
| <a name="l00049"></a>00049 <span class="comment">/**</span> |
| <a name="l00050"></a>00050 <span class="comment"> * @brief Raise an exception if the given condition is not satisfied.</span> |
| <a name="l00051"></a>00051 <span class="comment"> */</span> |
| <a name="l00052"></a>00052 CREATE FUNCTION MADLIB_SCHEMA.assert(condition BOOLEAN, msg VARCHAR) |
| <a name="l00053"></a>00053 RETURNS VOID |
| <a name="l00054"></a>00054 LANGUAGE plpgsql |
| <a name="l00055"></a><a class="code" href="utilities_8sql__in.html#a9ce7ffa76acc8a0638e9bc48be99f36a">00055</a> IMMUTABLE |
| <a name="l00056"></a>00056 AS $$ |
| <a name="l00057"></a>00057 BEGIN |
| <a name="l00058"></a>00058 IF NOT condition THEN |
| <a name="l00059"></a>00059 RAISE EXCEPTION <span class="stringliteral">'Failed assertion: %'</span>, msg; |
| <a name="l00060"></a>00060 END IF; |
| <a name="l00061"></a>00061 END |
| <a name="l00062"></a>00062 $$; |
| <a name="l00063"></a>00063 |
| <a name="l00064"></a>00064 ------------------------------------------------------------------------ |
| <a name="l00065"></a>00065 <span class="comment"></span> |
| <a name="l00066"></a>00066 <span class="comment">/**</span> |
| <a name="l00067"></a>00067 <span class="comment"> * @brief Compute the relative error of an approximate value</span> |
| <a name="l00068"></a>00068 <span class="comment"> */</span> |
| <a name="l00069"></a>00069 CREATE FUNCTION MADLIB_SCHEMA.relative_error( |
| <a name="l00070"></a>00070 approx DOUBLE PRECISION, |
| <a name="l00071"></a>00071 value DOUBLE PRECISION |
| <a name="l00072"></a>00072 ) RETURNS DOUBLE PRECISION |
| <a name="l00073"></a>00073 LANGUAGE sql |
| <a name="l00074"></a><a class="code" href="utilities_8sql__in.html#a76cfdbed8a6782f37f50710d855434bd">00074</a> AS $$ |
| <a name="l00075"></a>00075 SELECT abs(($1 - $2)/$2) |
| <a name="l00076"></a>00076 $$; |
| <a name="l00077"></a>00077 |
| <a name="l00078"></a>00078 ------------------------------------------------------------------------ |
| <a name="l00079"></a>00079 <span class="comment"></span> |
| <a name="l00080"></a>00080 <span class="comment">/**</span> |
| <a name="l00081"></a>00081 <span class="comment"> * @brief Compute the relative error (w.r.t. the 2-norm) of an apprixmate vector</span> |
| <a name="l00082"></a>00082 <span class="comment"> */</span> |
| <a name="l00083"></a>00083 CREATE FUNCTION MADLIB_SCHEMA.relative_error( |
| <a name="l00084"></a>00084 approx DOUBLE PRECISION[], |
| <a name="l00085"></a>00085 value DOUBLE PRECISION[] |
| <a name="l00086"></a>00086 ) RETURNS DOUBLE PRECISION |
| <a name="l00087"></a>00087 LANGUAGE sql |
| <a name="l00088"></a>00088 AS $$ |
| <a name="l00089"></a>00089 SELECT MADLIB_SCHEMA.dist_norm2($1, $2) / MADLIB_SCHEMA.norm2($2) |
| <a name="l00090"></a>00090 $$; |
| <a name="l00091"></a><a class="code" href="utilities_8sql__in.html#a4d49e00b4dd6059f61ffb9fdc0a696f7">00091</a> |
| <a name="l00092"></a>00092 ------------------------------------------------------------------------ |
| <a name="l00093"></a>00093 <span class="comment"></span> |
| <a name="l00094"></a>00094 <span class="comment">/**</span> |
| <a name="l00095"></a>00095 <span class="comment"> * @brief Check if a SQL statement raises an error</span> |
| <a name="l00096"></a>00096 <span class="comment"> *</span> |
| <a name="l00097"></a>00097 <span class="comment"> * @param sql The SQL statement</span> |
| <a name="l00098"></a>00098 <span class="comment"> * @returns \c TRUE if an exception is raised while executing \c sql, \c FALSE</span> |
| <a name="l00099"></a>00099 <span class="comment"> * otherwise.</span> |
| <a name="l00100"></a>00100 <span class="comment"> */</span> |
| <a name="l00101"></a>00101 CREATE FUNCTION MADLIB_SCHEMA.check_if_raises_error( |
| <a name="l00102"></a>00102 sql TEXT |
| <a name="l00103"></a>00103 ) RETURNS BOOLEAN |
| <a name="l00104"></a>00104 LANGUAGE plpgsql |
| <a name="l00105"></a><a class="code" href="utilities_8sql__in.html#a26a54368fbf2460323cacf95db76fd2f">00105</a> AS $$ |
| <a name="l00106"></a>00106 BEGIN |
| <a name="l00107"></a>00107 EXECUTE sql; |
| <a name="l00108"></a>00108 RETURN FALSE; |
| <a name="l00109"></a>00109 EXCEPTION |
| <a name="l00110"></a>00110 WHEN OTHERS THEN |
| <a name="l00111"></a>00111 RETURN TRUE; |
| <a name="l00112"></a>00112 END; |
| <a name="l00113"></a>00113 $$; |
| <a name="l00114"></a>00114 |
| <a name="l00115"></a>00115 ------------------------------------------------------------------------ |
| <a name="l00116"></a>00116 <span class="comment"></span> |
| <a name="l00117"></a>00117 <span class="comment">/**</span> |
| <a name="l00118"></a>00118 <span class="comment"> * @brief Check if a floating-point number is NaN (not a number)</span> |
| <a name="l00119"></a>00119 <span class="comment"> *</span> |
| <a name="l00120"></a>00120 <span class="comment"> * This function exists for portability. Some DBMSs like PostgreSQL treat</span> |
| <a name="l00121"></a>00121 <span class="comment"> * floating-point numbers as fully ordered -- contrary to IEEE 754. (See, e.g.,</span> |
| <a name="l00122"></a>00122 <span class="comment"> * the <a href=</span> |
| <a name="l00123"></a><a class="code" href="utilities_8sql__in.html#aa90ffaebb43a5cbcb5c48281cbadd3b0">00123</a> <span class="comment"> * "http://www.postgresql.org/docs/current/static/datatype-numeric.html#DATATYPE-FLOAT"</span> |
| <a name="l00124"></a>00124 <span class="comment"> * >PostgreSQL documentation</a>. For portability, MADlib code should not make</span> |
| <a name="l00125"></a>00125 <span class="comment"> * use of such "features" directly, but only use isnan() instead.</span> |
| <a name="l00126"></a>00126 <span class="comment"> *</span> |
| <a name="l00127"></a>00127 <span class="comment"> * @param number</span> |
| <a name="l00128"></a>00128 <span class="comment"> * @returns \c TRUE if \c number is \c NaN, \c FALSE otherwise</span> |
| <a name="l00129"></a>00129 <span class="comment"> */</span> |
| <a name="l00130"></a>00130 CREATE FUNCTION MADLIB_SCHEMA.isnan( |
| <a name="l00131"></a>00131 number DOUBLE PRECISION |
| <a name="l00132"></a>00132 ) RETURNS BOOLEAN |
| <a name="l00133"></a>00133 LANGUAGE sql |
| <a name="l00134"></a>00134 AS $$ |
| <a name="l00135"></a>00135 SELECT $1 = <span class="stringliteral">'NaN'</span>::DOUBLE PRECISION; |
| <a name="l00136"></a>00136 $$; |
| <a name="l00137"></a>00137 |
| <a name="l00138"></a>00138 ------------------------------------------------------------------------ |
| <a name="l00139"></a>00139 <span class="comment"></span> |
| <a name="l00140"></a>00140 <span class="comment">/**</span> |
| <a name="l00141"></a>00141 <span class="comment"> * @brief Create the temporary schema if it does not exist yet</span> |
| <a name="l00142"></a>00142 <span class="comment"> */</span> |
| <a name="l00143"></a>00143 CREATE FUNCTION MADLIB_SCHEMA.create_schema_pg_temp() |
| <a name="l00144"></a>00144 RETURNS VOID |
| <a name="l00145"></a>00145 LANGUAGE plpgsql |
| <a name="l00146"></a>00146 VOLATILE |
| <a name="l00147"></a>00147 AS $$ |
| <a name="l00148"></a>00148 BEGIN |
| <a name="l00149"></a>00149 -- pg_my_temp_schema() is a built-in function |
| <a name="l00150"></a>00150 IF pg_my_temp_schema() = 0 THEN |
| <a name="l00151"></a>00151 -- The pg_temp schema does not exist, yet. Creating a temporary table |
| <a name="l00152"></a><a class="code" href="utilities_8sql__in.html#a48bed63cab78a5446fa4c122eaae3a40">00152</a> -- will create it. Note: There is *no* race condition here, because |
| <a name="l00153"></a>00153 -- every session has its own temp schema. |
| <a name="l00154"></a>00154 EXECUTE 'CREATE TEMPORARY TABLE _madlib_temp_table AS SELECT 1; |
| <a name="l00155"></a>00155 DROP TABLE pg_temp._madlib_temp_table CASCADE;'; |
| <a name="l00156"></a>00156 END IF; |
| <a name="l00157"></a>00157 END; |
| <a name="l00158"></a>00158 $$; |
| <a name="l00159"></a>00159 |
| <a name="l00160"></a>00160 ------------------------------------------------------------------------ |
| <a name="l00161"></a>00161 <span class="comment"></span> |
| <a name="l00162"></a>00162 <span class="comment">/**</span> |
| <a name="l00163"></a>00163 <span class="comment"> * @brief Create volatile noop function</span> |
| <a name="l00164"></a>00164 <span class="comment"> *</span> |
| <a name="l00165"></a><a class="code" href="utilities_8sql__in.html#a56501b6f9fabe65d7a6a6beb70a0e000">00165</a> <span class="comment"> * The only use of this function is as an optimization fence when used in the</span> |
| <a name="l00166"></a>00166 <span class="comment"> * SELECT list of a query. See, e.g.,</span> |
| <a name="l00167"></a>00167 <span class="comment"> * http://archives.postgresql.org/pgsql-sql/2012-07/msg00030.php</span> |
| <a name="l00168"></a>00168 <span class="comment"> */</span> |
| <a name="l00169"></a>00169 CREATE FUNCTION MADLIB_SCHEMA.<a class="code" href="utilities_8sql__in.html#ab194d6a1222672c314ea39b78aad8fd0" title="Create volatile noop function.">noop</a>() |
| <a name="l00170"></a>00170 RETURNS VOID |
| <a name="l00171"></a>00171 VOLATILE |
| <a name="l00172"></a>00172 LANGUAGE c |
| <a name="l00173"></a>00173 AS 'MODULE_PATHNAME'; |
| <a name="l00174"></a>00174 |
| <a name="l00175"></a>00175 ------------------------------------------------------------------------ |
| <a name="l00176"></a>00176 |
| <a name="l00177"></a>00177 <span class="comment">/*</span> |
| <a name="l00178"></a>00178 <span class="comment"> * Create type bytea8 with 8-byte alignment.</span> |
| <a name="l00179"></a>00179 <span class="comment"> */</span> |
| <a name="l00180"></a>00180 CREATE TYPE MADLIB_SCHEMA.bytea8; |
| <a name="l00181"></a>00181 |
| <a name="l00182"></a>00182 CREATE FUNCTION MADLIB_SCHEMA.bytea8in(cstring) |
| <a name="l00183"></a>00183 RETURNS MADLIB_SCHEMA.bytea8 AS 'byteain' |
| <a name="l00184"></a>00184 LANGUAGE internal IMMUTABLE STRICT; |
| <a name="l00185"></a>00185 |
| <a name="l00186"></a>00186 CREATE FUNCTION MADLIB_SCHEMA.bytea8out(MADLIB_SCHEMA.bytea8) |
| <a name="l00187"></a>00187 RETURNS cstring AS 'byteaout' |
| <a name="l00188"></a>00188 LANGUAGE internal IMMUTABLE STRICT; |
| <a name="l00189"></a>00189 |
| <a name="l00190"></a>00190 CREATE FUNCTION MADLIB_SCHEMA.bytea8recv(internal) |
| <a name="l00191"></a><a class="code" href="utilities_8sql__in.html#ab194d6a1222672c314ea39b78aad8fd0">00191</a> RETURNS MADLIB_SCHEMA.bytea8 AS 'bytearecv' |
| <a name="l00192"></a>00192 LANGUAGE internal IMMUTABLE STRICT; |
| <a name="l00193"></a>00193 |
| <a name="l00194"></a>00194 CREATE FUNCTION MADLIB_SCHEMA.bytea8send(MADLIB_SCHEMA.bytea8) |
| <a name="l00195"></a>00195 RETURNS bytea AS 'byteasend' |
| <a name="l00196"></a>00196 LANGUAGE internal IMMUTABLE STRICT; |
| <a name="l00197"></a>00197 |
| <a name="l00198"></a>00198 CREATE TYPE MADLIB_SCHEMA.bytea8( |
| <a name="l00199"></a>00199 INPUT = MADLIB_SCHEMA.bytea8in, |
| <a name="l00200"></a>00200 OUTPUT = MADLIB_SCHEMA.bytea8out, |
| <a name="l00201"></a>00201 RECEIVE = MADLIB_SCHEMA.bytea8recv, |
| <a name="l00202"></a>00202 SEND = MADLIB_SCHEMA.bytea8send, |
| <a name="l00203"></a>00203 ALIGNMENT = <span class="keywordtype">double</span> |
| <a name="l00204"></a>00204 ); |
| <a name="l00205"></a>00205 |
| <a name="l00206"></a>00206 ------------------------------------------------------------------------<span class="comment"></span> |
| <a name="l00207"></a>00207 <span class="comment">/**</span> |
| <a name="l00208"></a>00208 <span class="comment"> * @brief Generate random remporary names for temp table and other names</span> |
| <a name="l00209"></a>00209 <span class="comment"> */</span> |
| <a name="l00210"></a>00210 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.<a class="code" href="utilities_8sql__in.html#a5b0156044142673183205154f9e63ddc" title="Generate random remporary names for temp table and other names.">__unique_string</a> () |
| <a name="l00211"></a>00211 RETURNS VARCHAR AS $$ |
| <a name="l00212"></a>00212 PythonFunction(utilities, utilities, <a class="code" href="utilities_8sql__in.html#a5b0156044142673183205154f9e63ddc" title="Generate random remporary names for temp table and other names.">__unique_string</a>) |
| <a name="l00213"></a>00213 $$ LANGUAGE plpythonu; |
| <a name="l00214"></a>00214 |
| <a name="l00215"></a>00215 ------------------------------------------------------------------------<span class="comment"></span> |
| <a name="l00216"></a>00216 <span class="comment">/**</span> |
| <a name="l00217"></a>00217 <span class="comment"> * @brief Cast boolean into text</span> |
| <a name="l00218"></a>00218 <span class="comment"> */</span> |
| <a name="l00219"></a>00219 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.<a class="code" href="utilities_8sql__in.html#abc867482053e6692047d051b679953a5" title="Cast boolean into text.">bool_to_text</a> (BOOLEAN) |
| <a name="l00220"></a>00220 RETURNS TEXT |
| <a name="l00221"></a>00221 STRICT |
| <a name="l00222"></a>00222 LANGUAGE SQL AS ' |
| <a name="l00223"></a>00223 SELECT CASE |
| <a name="l00224"></a>00224 WHEN $1 THEN ''t'' |
| <a name="l00225"></a>00225 ELSE ''f'' |
| <a name="l00226"></a>00226 END; |
| <a name="l00227"></a>00227 '; |
| <a name="l00228"></a>00228 |
| <a name="l00229"></a>00229 m4_ifdef(`__GREENPLUM__', ` |
| <a name="l00230"></a>00230 CREATE CAST (BOOLEAN AS TEXT) |
| <a name="l00231"></a>00231 WITH FUNCTION MADLIB_SCHEMA.<a class="code" href="utilities_8sql__in.html#abc867482053e6692047d051b679953a5" title="Cast boolean into text.">bool_to_text</a>(BOOLEAN) |
| <a name="l00232"></a><a class="code" href="utilities_8sql__in.html#a5b0156044142673183205154f9e63ddc">00232</a> AS ASSIGNMENT; |
| <a name="l00233"></a>00233 ') |
| <a name="l00234"></a>00234 |
| <a name="l00235"></a>00235 |
| <a name="l00236"></a>00236 ------------------------------------------------------------------------ |
| <a name="l00237"></a>00237 |
| <a name="l00238"></a>00238 <span class="comment">/*</span> |
| <a name="l00239"></a>00239 <span class="comment"> * An array_agg() function is defined in module array_ops (to compatibility with</span> |
| <a name="l00240"></a>00240 <span class="comment"> * GP 4.0.</span> |
| <a name="l00241"></a><a class="code" href="utilities_8sql__in.html#abc867482053e6692047d051b679953a5">00241</a> <span class="comment"> */</span> |
| <a name="l00242"></a>00242 |
| <a name="l00243"></a>00243 m4_changequote(<!`!>,<!'!>) |
| </pre></div></div> |
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