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<title>MADlib: utilities.sql_in File Reference</title>
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<div class="header">
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<a href="#func-members">Functions</a>  </div>
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<div class="title">utilities.sql_in File Reference</div>  </div>
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<p>SQL functions for carrying out routine tasks.  
<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:a9ce7ffa76acc8a0638e9bc48be99f36a"><td class="memItemLeft" align="right" valign="top">text&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a9ce7ffa76acc8a0638e9bc48be99f36a">version</a> ()</td></tr>
<tr class="memdesc:a9ce7ffa76acc8a0638e9bc48be99f36a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Return MADlib build information.  <a href="#a9ce7ffa76acc8a0638e9bc48be99f36a">More...</a><br/></td></tr>
<tr class="separator:a9ce7ffa76acc8a0638e9bc48be99f36a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a76cfdbed8a6782f37f50710d855434bd"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a76cfdbed8a6782f37f50710d855434bd">assert</a> (boolean condition, varchar msg)</td></tr>
<tr class="memdesc:a76cfdbed8a6782f37f50710d855434bd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Raise an exception if the given condition is not satisfied.  <a href="#a76cfdbed8a6782f37f50710d855434bd">More...</a><br/></td></tr>
<tr class="separator:a76cfdbed8a6782f37f50710d855434bd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4d49e00b4dd6059f61ffb9fdc0a696f7"><td class="memItemLeft" align="right" valign="top">float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a4d49e00b4dd6059f61ffb9fdc0a696f7">relative_error</a> (float8 approx, float8 value)</td></tr>
<tr class="memdesc:a4d49e00b4dd6059f61ffb9fdc0a696f7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Compute the relative error of an approximate value.  <a href="#a4d49e00b4dd6059f61ffb9fdc0a696f7">More...</a><br/></td></tr>
<tr class="separator:a4d49e00b4dd6059f61ffb9fdc0a696f7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a26a54368fbf2460323cacf95db76fd2f"><td class="memItemLeft" align="right" valign="top">float8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a26a54368fbf2460323cacf95db76fd2f">relative_error</a> (float8[] approx, float8[] value)</td></tr>
<tr class="memdesc:a26a54368fbf2460323cacf95db76fd2f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Compute the relative error (w.r.t. the 2-norm) of an apprixmate vector.  <a href="#a26a54368fbf2460323cacf95db76fd2f">More...</a><br/></td></tr>
<tr class="separator:a26a54368fbf2460323cacf95db76fd2f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa90ffaebb43a5cbcb5c48281cbadd3b0"><td class="memItemLeft" align="right" valign="top">boolean&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#aa90ffaebb43a5cbcb5c48281cbadd3b0">check_if_raises_error</a> (text sql)</td></tr>
<tr class="memdesc:aa90ffaebb43a5cbcb5c48281cbadd3b0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Check if a SQL statement raises an error.  <a href="#aa90ffaebb43a5cbcb5c48281cbadd3b0">More...</a><br/></td></tr>
<tr class="separator:aa90ffaebb43a5cbcb5c48281cbadd3b0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac1f509bd94c6309b59eb4d479fb2a470"><td class="memItemLeft" align="right" valign="top">boolean&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#ac1f509bd94c6309b59eb4d479fb2a470">check_if_col_exists</a> (text source_table, text column_name)</td></tr>
<tr class="memdesc:ac1f509bd94c6309b59eb4d479fb2a470"><td class="mdescLeft">&#160;</td><td class="mdescRight">Check if a column exists in a table.  <a href="#ac1f509bd94c6309b59eb4d479fb2a470">More...</a><br/></td></tr>
<tr class="separator:ac1f509bd94c6309b59eb4d479fb2a470"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a48bed63cab78a5446fa4c122eaae3a40"><td class="memItemLeft" align="right" valign="top">boolean&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a48bed63cab78a5446fa4c122eaae3a40">isnan</a> (float8 number)</td></tr>
<tr class="memdesc:a48bed63cab78a5446fa4c122eaae3a40"><td class="mdescLeft">&#160;</td><td class="mdescRight">Check if a floating-point number is NaN (not a number)  <a href="#a48bed63cab78a5446fa4c122eaae3a40">More...</a><br/></td></tr>
<tr class="separator:a48bed63cab78a5446fa4c122eaae3a40"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a56501b6f9fabe65d7a6a6beb70a0e000"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a56501b6f9fabe65d7a6a6beb70a0e000">create_schema_pg_temp</a> ()</td></tr>
<tr class="memdesc:a56501b6f9fabe65d7a6a6beb70a0e000"><td class="mdescLeft">&#160;</td><td class="mdescRight">Create the temporary schema if it does not exist yet.  <a href="#a56501b6f9fabe65d7a6a6beb70a0e000">More...</a><br/></td></tr>
<tr class="separator:a56501b6f9fabe65d7a6a6beb70a0e000"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab194d6a1222672c314ea39b78aad8fd0"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#ab194d6a1222672c314ea39b78aad8fd0">noop</a> ()</td></tr>
<tr class="memdesc:ab194d6a1222672c314ea39b78aad8fd0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Create volatile noop function.  <a href="#ab194d6a1222672c314ea39b78aad8fd0">More...</a><br/></td></tr>
<tr class="separator:ab194d6a1222672c314ea39b78aad8fd0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a60c4765ce8dc639cbb0ad4c389f5f1ad"><td class="memItemLeft" align="right" valign="top">bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a60c4765ce8dc639cbb0ad4c389f5f1ad">bytea8in</a> (cstring)</td></tr>
<tr class="separator:a60c4765ce8dc639cbb0ad4c389f5f1ad"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:adff923d42d4bdb2b631d6cafd5f37a43"><td class="memItemLeft" align="right" valign="top">cstring&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#adff923d42d4bdb2b631d6cafd5f37a43">bytea8out</a> (bytea8)</td></tr>
<tr class="separator:adff923d42d4bdb2b631d6cafd5f37a43"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a244a7ff30f2788a6f4816417982eb13b"><td class="memItemLeft" align="right" valign="top">bytea8&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a244a7ff30f2788a6f4816417982eb13b">bytea8recv</a> (internal)</td></tr>
<tr class="separator:a244a7ff30f2788a6f4816417982eb13b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aeb90c740e8e6b67aa60a11c430fa9050"><td class="memItemLeft" align="right" valign="top">bytea&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#aeb90c740e8e6b67aa60a11c430fa9050">bytea8send</a> (bytea8)</td></tr>
<tr class="separator:aeb90c740e8e6b67aa60a11c430fa9050"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a7086f5e79c0f53a849759227759d16d7"><td class="memItemLeft" align="right" valign="top">varchar&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a7086f5e79c0f53a849759227759d16d7">__internal_get_col_names_except_dep_variable</a> (varchar source_table, varchar dependent_varname)</td></tr>
<tr class="memdesc:a7086f5e79c0f53a849759227759d16d7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get all column names except dependent variable.  <a href="#a7086f5e79c0f53a849759227759d16d7">More...</a><br/></td></tr>
<tr class="separator:a7086f5e79c0f53a849759227759d16d7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5b0156044142673183205154f9e63ddc"><td class="memItemLeft" align="right" valign="top">varchar&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a5b0156044142673183205154f9e63ddc">__unique_string</a> ()</td></tr>
<tr class="memdesc:a5b0156044142673183205154f9e63ddc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generate random remporary names for temp table and other names.  <a href="#a5b0156044142673183205154f9e63ddc">More...</a><br/></td></tr>
<tr class="separator:a5b0156044142673183205154f9e63ddc"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a967afc3041b28c8ceedcef8d25c26b9b"><td class="memItemLeft" align="right" valign="top">varchar[]&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a967afc3041b28c8ceedcef8d25c26b9b">_string_to_array</a> (varchar s)</td></tr>
<tr class="memdesc:a967afc3041b28c8ceedcef8d25c26b9b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Takes a string of comma separated values and puts it into an array.  <a href="#a967afc3041b28c8ceedcef8d25c26b9b">More...</a><br/></td></tr>
<tr class="separator:a967afc3041b28c8ceedcef8d25c26b9b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:abc867482053e6692047d051b679953a5"><td class="memItemLeft" align="right" valign="top">text&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#abc867482053e6692047d051b679953a5">bool_to_text</a> (boolean)</td></tr>
<tr class="memdesc:abc867482053e6692047d051b679953a5"><td class="mdescLeft">&#160;</td><td class="mdescRight">Cast boolean into text.  <a href="#abc867482053e6692047d051b679953a5">More...</a><br/></td></tr>
<tr class="separator:abc867482053e6692047d051b679953a5"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:abdd2768e61b034d04c934a981259bbfd"><td class="memItemLeft" align="right" valign="top">text&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#abdd2768e61b034d04c934a981259bbfd">__to_char</a> (anyelement val)</td></tr>
<tr class="memdesc:abdd2768e61b034d04c934a981259bbfd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Cast any value to text.  <a href="#abdd2768e61b034d04c934a981259bbfd">More...</a><br/></td></tr>
<tr class="separator:abdd2768e61b034d04c934a981259bbfd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2dc21ec6de26adef2cf1699ed8dab5aa"><td class="memItemLeft" align="right" valign="top">set&lt; _grp_state_type &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="utilities_8sql__in.html#a2dc21ec6de26adef2cf1699ed8dab5aa">_gen_state</a> (text[] grp_key, integer[] iteration, float8[] state)</td></tr>
<tr class="separator:a2dc21ec6de26adef2cf1699ed8dab5aa"><td class="memSeparator" colspan="2">&#160;</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 a brief overview of utility functions, see the module description <a class="el" href="group__grp__utilities.html">DB Administrator Utilities</a>. </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="a7086f5e79c0f53a849759227759d16d7"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">varchar __internal_get_col_names_except_dep_variable </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>source_table</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>dependent_varname</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a class="anchor" id="abdd2768e61b034d04c934a981259bbfd"></a>
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<div class="memproto">
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          <td class="memname">text __to_char </td>
          <td>(</td>
          <td class="paramtype">anyelement&#160;</td>
          <td class="paramname"><em>val</em>)</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">val</td><td>A value with any specific type.</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The text format string for the value.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>Greenplum doesn't support bit/boolean to text casting. </dd></dl>

</div>
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<a class="anchor" id="a5b0156044142673183205154f9e63ddc"></a>
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          <td class="memname">varchar __unique_string </td>
          <td>(</td>
          <td class="paramname">)</td><td></td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a class="anchor" id="a2dc21ec6de26adef2cf1699ed8dab5aa"></a>
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          <td class="memname">set&lt;_grp_state_type&gt; _gen_state </td>
          <td>(</td>
          <td class="paramtype">text[]&#160;</td>
          <td class="paramname"><em>grp_key</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">integer[]&#160;</td>
          <td class="paramname"><em>iteration</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float8[]&#160;</td>
          <td class="paramname"><em>state</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
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          <td class="memname">varchar [] _string_to_array </td>
          <td>(</td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>s</em>)</td><td></td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
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          <td class="memname">void assert </td>
          <td>(</td>
          <td class="paramtype">boolean&#160;</td>
          <td class="paramname"><em>condition</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">varchar&#160;</td>
          <td class="paramname"><em>msg</em>&#160;</td>
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          <td>)</td>
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          <td class="memname">text bool_to_text </td>
          <td>(</td>
          <td class="paramtype">boolean&#160;</td>
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          <td class="paramname"><em>column_name</em>&#160;</td>
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<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">source_table</td><td>Source table </td></tr>
    <tr><td class="paramname">column_name</td><td>Column name in the table </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>TRUE</code> if it exsists and FALSE if not </dd></dl>

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<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">sql</td><td>The SQL statement </td></tr>
  </table>
  </dd>
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<dl class="section return"><dt>Returns</dt><dd><code>TRUE</code> if an exception is raised while executing <code>sql</code>, <code>FALSE</code> otherwise. </dd></dl>

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<p>This function exists for portability. Some DBMSs like PostgreSQL treat floating-point numbers as fully ordered &ndash; contrary to IEEE 754. (See, e.g., the <a href="http://www.postgresql.org/docs/current/static/datatype-numeric.html#DATATYPE-FLOAT">PostgreSQL documentation</a>. For portability, MADlib code should not make use of such "features" directly, but only use <a class="el" href="utilities_8sql__in.html#a48bed63cab78a5446fa4c122eaae3a40" title="Check if a floating-point number is NaN (not a number) ">isnan()</a> instead.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">number</td><td></td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>TRUE</code> if <code>number</code> is <code>NaN</code>, <code>FALSE</code> otherwise </dd></dl>

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<p>The only use of this function is as an optimization fence when used in the SELECT list of a query. See, e.g., <a href="http://archives.postgresql.org/pgsql-sql/2012-07/msg00030.php">http://archives.postgresql.org/pgsql-sql/2012-07/msg00030.php</a> </p>

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          <td>(</td>
          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>approx</em>, </td>
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          <td class="paramkey"></td>
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          <td class="paramtype">float8&#160;</td>
          <td class="paramname"><em>value</em>&#160;</td>
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          <td class="paramtype">float8[]&#160;</td>
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          <td class="paramkey"></td>
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          <td class="paramtype">float8[]&#160;</td>
          <td class="paramname"><em>value</em>&#160;</td>
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<dl class="section return"><dt>Returns</dt><dd>Summary of MADlib build information, consisting of MADlib version, git revision, cmake configuration time, build type, build system, C compiler, and C++ compiler </dd></dl>

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