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<nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Apache Tajo</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="../functions.html">Functions</a> »</li> + + <li>Math Functions and Operators</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/functions/math_func_and_operators.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="math-functions-and-operators"> +<h1>Math Functions and Operators<a class="headerlink" href="#math-functions-and-operators" title="Permalink to this headline">¶</a></h1> +<dl class="function"> +<dt id="abs"> +<code class="descname">abs</code><span class="sig-paren">(</span><em>number int|float</em><span class="sig-paren">)</span><a class="headerlink" href="#abs" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns absolute value</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – input number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">same as a parameter type</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="k">abs</span><span class="p">(</span><span class="o">-</span><span class="mi">9</span><span class="p">);</span> +<span class="o">></span> <span class="mi">9</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="acos"> +<code class="descname">acos</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#acos" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the arc cosine of number value</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – input number as radian</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">acos</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">3</span><span class="p">);</span> +<span class="o">></span> <span class="mi">1</span><span class="p">.</span><span class="mi">2661036727794992</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="asin"> +<code class="descname">asin</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#asin" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the arc sine of number value</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – input number as radian</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">acos</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">8</span><span class="p">);</span> +<span class="o">></span> <span class="mi">0</span><span class="p">.</span><span class="mi">9272952180016123</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="atan"> +<code class="descname">atan</code><span class="sig-paren">(</span><em>number float8</em><span class="sig-paren">)</span><a class="headerlink" href="#atan" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the arc tangent of number value</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – input number as radian</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">atan</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">8</span><span class="p">);</span> +<span class="o">></span> <span class="mi">0</span><span class="p">.</span><span class="mi">6747409422235527</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="atan2"> +<code class="descname">atan2</code><span class="sig-paren">(</span><em>y float</em>, <em>x float</em><span class="sig-paren">)</span><a class="headerlink" href="#atan2" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the angle theta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta)</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>y</strong> – the ordinate(y axis) coordinate</li> +<li><strong>x</strong> – the abscissa(x axis) coordinate</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">float8</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">atan2</span><span class="p">(</span><span class="mi">2</span><span class="p">.</span><span class="mi">7</span><span class="p">,</span> <span class="mi">0</span><span class="p">.</span><span class="mi">3</span><span class="p">);</span> +<span class="o">></span> <span class="mi">1</span><span class="p">.</span><span class="mi">460139105621001</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="cbrt"> +<code class="descname">cbrt</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#cbrt" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the cube root of a number</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target real number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">cbrt</span><span class="p">(</span><span class="mi">27</span><span class="p">.</span><span class="mi">0</span><span class="p">);</span> +<span class="o">></span> <span class="mi">3</span><span class="p">.</span><span class="mi">0</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="ceil"> +<code class="descname">ceil</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#ceil" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns a smallest integer not less than argument</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target real number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">int8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">ceil</span><span class="p">(</span><span class="o">-</span><span class="mi">42</span><span class="p">.</span><span class="mi">8</span><span class="p">);</span> +<span class="o">></span> <span class="o">-</span><span class="mi">42</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="cos"> +<code class="descname">cos</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#cos" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the cosine of a number</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target real number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">cos</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">7</span><span class="p">);</span> +<span class="o">></span> <span class="mi">0</span><span class="p">.</span><span class="mi">7648421872844885</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="degrees"> +<code class="descname">degrees</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#degrees" title="Permalink to this definition">¶</a></dt> +<dd><p>Converts radians to degrees</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – radian value</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">degrees</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">8</span><span class="p">);</span> +<span class="o">></span> <span class="mi">45</span><span class="p">.</span><span class="mi">83662361046586</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="div"> +<code class="descname">div</code><span class="sig-paren">(</span><em>num1 int</em>, <em>num2 int</em><span class="sig-paren">)</span><a class="headerlink" href="#div" title="Permalink to this definition">¶</a></dt> +<dd><p>Integer division truncates resut</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>num1</strong> – number to be divided</li> +<li><strong>num2</strong> – number to divide</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">int8</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">div</span><span class="p">(</span><span class="mi">8</span><span class="p">,</span><span class="mi">3</span><span class="p">);</span> +<span class="o">></span> <span class="mi">2</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="exp"> +<code class="descname">exp</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#exp" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns Euler’s number e raised to the power of a number</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – input number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">exp</span><span class="p">(</span><span class="mi">1</span><span class="p">.</span><span class="mi">0</span><span class="p">);</span> +<span class="o">></span> <span class="mi">2</span><span class="p">.</span><span class="mi">718281828459045</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="floor"> +<code class="descname">floor</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#floor" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns a largest integer not greater than argument</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target real number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">int8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">floor</span><span class="p">(</span><span class="mi">53</span><span class="p">.</span><span class="mi">1</span><span class="p">);</span> +<span class="o">></span> <span class="mi">53</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="mod"> +<code class="descname">mod</code><span class="sig-paren">(</span><em>num1 int</em>, <em>num2 int</em><span class="sig-paren">)</span><a class="headerlink" href="#mod" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns remainder of num1 / num2</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>num1</strong> – number to be divided</li> +<li><strong>num2</strong> – number to divide</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">int8</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="k">mod</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span><span class="mi">3</span><span class="p">);</span> +<span class="o">></span> <span class="mi">1</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="pi"> +<code class="descname">pi</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pi" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns constant value of pi</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-even field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">pi</span><span class="p">();</span> +<span class="o">></span> <span class="mi">3</span><span class="p">.</span><span class="mi">141592653589793</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="pow"> +<code class="descname">pow</code><span class="sig-paren">(</span><em>x float</em>, <em>y float</em><span class="sig-paren">)</span><a class="headerlink" href="#pow" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns value of x raised to the power of y</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>x</strong> – base number</li> +<li><strong>y</strong> – exponent</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">float8</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">pow</span><span class="p">(</span><span class="mi">2</span><span class="p">.</span><span class="mi">0</span><span class="p">,</span> <span class="mi">10</span><span class="p">.</span><span class="mi">0</span><span class="p">);</span> +<span class="o">></span> <span class="mi">1024</span><span class="p">.</span><span class="mi">0</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="radians"> +<code class="descname">radians</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#radians" title="Permalink to this definition">¶</a></dt> +<dd><p>Converts degrees to radians</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – degree value</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">radians</span><span class="p">(</span><span class="mi">45</span><span class="p">.</span><span class="mi">0</span><span class="p">);</span> +<span class="o">></span> <span class="mi">0</span><span class="p">.</span><span class="mi">7853981633974483</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="round"> +<code class="descname">round</code><span class="sig-paren">(</span><em>number int|float</em><span class="sig-paren">)</span><a class="headerlink" href="#round" title="Permalink to this definition">¶</a></dt> +<dd><p>Rounds to nearest integer</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">int8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">round</span><span class="p">(</span><span class="mi">5</span><span class="p">.</span><span class="mi">1</span><span class="p">);</span> +<span class="o">></span> <span class="mi">5</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="sign"> +<code class="descname">sign</code><span class="sig-paren">(</span><em>number int|float</em><span class="sig-paren">)</span><a class="headerlink" href="#sign" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns sign of argument as -1, 0, 1</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">sign</span><span class="p">(</span><span class="o">-</span><span class="mi">8</span><span class="p">.</span><span class="mi">4</span><span class="p">);</span> +<span class="o">></span> <span class="o">-</span><span class="mi">1</span><span class="p">.</span><span class="mi">0</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="sin"> +<code class="descname">sin</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#sin" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the sine of number value</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">sin</span><span class="p">(</span><span class="mi">1</span><span class="p">.</span><span class="mi">0</span><span class="p">);</span> +<span class="o">></span> <span class="mi">0</span><span class="p">.</span><span class="mi">8414709848078965</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="sqrt"> +<code class="descname">sqrt</code><span class="sig-paren">(</span><em>number float8</em><span class="sig-paren">)</span><a class="headerlink" href="#sqrt" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the square root of a number</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">sqrt</span><span class="p">(</span><span class="mi">256</span><span class="p">.</span><span class="mi">0</span><span class="p">);</span> +<span class="o">></span> <span class="mi">16</span><span class="p">.</span><span class="mi">0</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="tan"> +<code class="descname">tan</code><span class="sig-paren">(</span><em>number float</em><span class="sig-paren">)</span><a class="headerlink" href="#tan" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns the tangent of number value</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>number</strong> – target number</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float8</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">tan</span><span class="p">(</span><span class="mi">0</span><span class="p">.</span><span class="mi">2</span><span class="p">);</span> +<span class="o">></span> <span class="mi">0</span><span class="p">.</span><span class="mi">2027100355086725</span> +</pre></div> +</div> +</dd></dl> + +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="string_func_and_operators.html" class="btn btn-neutral float-right" title="String Functions and Operators"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="../functions.html" class="btn btn-neutral" title="Functions"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, Apache Tajo 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configuration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../swift_integration.html#querying-on-swift">Querying on Swift</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../jdbc_driver.html">Tajo JDBC Driver</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#how-to-get-jdbc-driver">How to get JDBC driver</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#setting-the-classpath">Setting the CLASSPATH</a></li> +<li class="toctree-l2"><a class="reference internal" href="../jdbc_driver.html#an-example-jdbc-client">An Example JDBC Client</a></li> +</ul> +</li> +<li class="toctree-l1"><a class="reference internal" href="../tajo_client_api.html">Tajo Client API</a></li> +<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li> +</ul> + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Apache Tajo</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Docs</a> »</li> + + <li><a href="../functions.html">Functions</a> »</li> + + <li>Network Functions and Operators</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/functions/network_func_and_operators.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="network-functions-and-operators"> +<h1>Network Functions and Operators<a class="headerlink" href="#network-functions-and-operators" title="Permalink to this headline">¶</a></h1> +<div class="section" id="prerequisites"> +<h2>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this headline">¶</a></h2> +<p>Apache Tajo provides network functions and operations using GeoIP databases. +To use these functions and operations, the GeoIP database should be precedently installed in local disks of +all the workers. +(Please refer the install instruction in <a class="reference external" href="http://dev.maxmind.com/geoip/legacy/downloadable/";>http://dev.maxmind.com/geoip/legacy/downloadable/</a>)</p> +<p>Once the GeoIP database is installed, you should specify the install location in <code class="docutils literal"><span class="pre">conf/tajo-site.xml</span></code> +as follows.</p> +<div class="highlight-python"><div class="highlight"><pre><property> + <name>tajo.function.geoip-database-location</name> + <value>/path/to/geoip/database/file</value> +</property> +</pre></div> +</div> +</div> +<div class="section" id="supported-functions"> +<h2>Supported Functions<a class="headerlink" href="#supported-functions" title="Permalink to this headline">¶</a></h2> +<dl class="function"> +<dt id="geoip_country_code"> +<code class="descname">geoip_country_code</code><span class="sig-paren">(</span><em>string addr</em><span class="sig-paren">)</span><a class="headerlink" href="#geoip_country_code" title="Permalink to this definition">¶</a></dt> +<dd><p>Convert an ipv4 address string to a geoip country code.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>addr</strong> – ipv4 address string</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">text</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">geoip_country_code</span><span class="p">(</span><span class="s1">'163.152.71.31'</span><span class="p">)</span> +<span class="o">></span> <span class="s1">'KR'</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt> +<code class="descname">geoip_country_code</code><span class="sig-paren">(</span><em>inet4 addr</em><span class="sig-paren">)</span></dt> +<dd><p>Convert an ipv4 address to a geoip country code.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>addr</strong> – ipv4 address</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">text</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">geoip_country_code</span><span class="p">(</span><span class="mi">163</span><span class="p">.</span><span class="mi">152</span><span class="p">.</span><span class="mi">71</span><span class="p">.</span><span class="mi">31</span><span class="p">)</span> +<span class="o">></span> <span class="s1">'KR'</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="geoip_in_country"> +<code class="descname">geoip_in_country</code><span class="sig-paren">(</span><em>string addr</em>, <em>string code</em><span class="sig-paren">)</span><a class="headerlink" href="#geoip_in_country" title="Permalink to this definition">¶</a></dt> +<dd><p>If the given country code is same with the country code of the given address, it returns true. Otherwise, returns false.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>addr</strong> – ipv4 address string</li> +<li><strong>code</strong> – country code</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">boolean</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">geoip_in_country</span><span class="p">(</span><span class="s1">'163.152.71.31'</span><span class="p">,</span> <span class="s1">'KR'</span><span class="p">)</span> +<span class="o">></span> <span class="k">true</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt> +<code class="descname">geoip_in_country</code><span class="sig-paren">(</span><em>inet4 addr</em>, <em>string code</em><span class="sig-paren">)</span></dt> +<dd><p>If the given country code is same with the country code of the given address, it returns true. Otherwise, returns false.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>addr</strong> – ipv4 address</li> +<li><strong>code</strong> – country code</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">boolean</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">geoip_in_country</span><span class="p">(</span><span class="mi">163</span><span class="p">.</span><span class="mi">152</span><span class="p">.</span><span class="mi">71</span><span class="p">.</span><span class="mi">31</span><span class="p">,</span> <span class="s1">'KR'</span><span class="p">)</span> +<span class="o">></span> <span class="k">true</span> +</pre></div> +</div> +</dd></dl> + +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="json_func.html" class="btn btn-neutral float-right" title="JSON Functions"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="datetime_func_and_operators.html" class="btn btn-neutral" title="DateTime Functions and Operators"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, Apache Tajo Team. + </p> + </div> + + <a href="https://github.com/snide/sphinx_rtd_theme";>Sphinx theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a> +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + 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+ <li><a href="../index.html">Docs</a> »</li> + + <li><a href="../functions.html">Functions</a> »</li> + + <li>String Functions and Operators</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/functions/string_func_and_operators.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + <div role="main"> + + <div class="section" id="string-functions-and-operators"> +<h1>String Functions and Operators<a class="headerlink" href="#string-functions-and-operators" title="Permalink to this headline">¶</a></h1> +<dl class="function"> +<dt> +<code class="descname">str1 || str2</code></dt> +<dd><p>Returns the concatnenated string of both side strings <code class="docutils literal"><span class="pre">str1</span></code> and <code class="docutils literal"><span class="pre">str2</span></code>.</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>str1</strong> – first string</li> +<li><strong>str2</strong> – second string</li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre>select âTaâ || âjoâ; +> 'Tajo' +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="char_length"> +<code class="descname">char_length</code><span class="sig-paren">(</span><em>string text</em><span class="sig-paren">)</span><a class="headerlink" href="#char_length" title="Permalink to this definition">¶</a></dt> +<dd><p>Returns Number of characters in string</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>string</strong> – to be counted</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">int4</td> +</tr> +<tr class="field-odd field"><th class="field-name">Alias:</th><td class="field-body">character_length</td> +</tr> +<tr class="field-even field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre>select char_length(âTajoâ); +> 4 +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="trim"> +<code class="descname">trim</code><span class="sig-paren">(</span><em>[leading | trailing | both] [characters] from string</em><span class="sig-paren">)</span><a class="headerlink" href="#trim" title="Permalink to this definition">¶</a></dt> +<dd><p>Removes the characters (a space by default) from the start/end/both ends of the string</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>string</strong> – </li> +<li><strong>characters</strong> – </li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre>select trim(both âxâ from âxTajoxxâ); +> Tajo +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="btrim"> +<code class="descname">btrim</code><span class="sig-paren">(</span><em>string text</em><span class="optional">[</span>, <em>characters text</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#btrim" title="Permalink to this definition">¶</a></dt> +<dd><p>Removes the characters (a space by default) from the both ends of the string</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>string</strong> – </li> +<li><strong>characters</strong> – </li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Alias:</th><td class="field-body"><p class="first">trim</p> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre>select btrim(âxTajoxxâ, âxâ); +> Tajo +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="ltrim"> +<code class="descname">ltrim</code><span class="sig-paren">(</span><em>string text</em><span class="optional">[</span>, <em>characters text</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#ltrim" title="Permalink to this definition">¶</a></dt> +<dd><p>Removes the characters (a space by default) from the start ends of the string</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>string</strong> – </li> +<li><strong>characters</strong> – </li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre>select ltrim(âxxTajoâ, âxâ); +> Tajo +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="rtrim"> +<code class="descname">rtrim</code><span class="sig-paren">(</span><em>string text</em><span class="optional">[</span>, <em>characters text</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#rtrim" title="Permalink to this definition">¶</a></dt> +<dd><p>Removes the characters (a space by default) from the end ends of the string</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>string</strong> – </li> +<li><strong>characters</strong> – </li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="n">rtrim</span><span class="p">(</span><span class="s1">'Tajoxx'</span><span class="p">,</span> <span class="s1">'x'</span><span class="p">);</span> +<span class="o">></span> <span class="n">Tajo</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="split_part"> +<code class="descname">split_part</code><span class="sig-paren">(</span><em>string text</em>, <em>delimiter text</em>, <em>field int</em><span class="sig-paren">)</span><a class="headerlink" href="#split_part" title="Permalink to this definition">¶</a></dt> +<dd><p>Splits a string on delimiter and return the given field (counting from one)</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>string</strong> – </li> +<li><strong>delimiter</strong> – </li> +<li><strong>field</strong> – </li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre>select split_part(âab_bc_cdâ,â_â,2); +> bc +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="regexp_replace"> +<code class="descname">regexp_replace</code><span class="sig-paren">(</span><em>string text</em>, <em>pattern text</em>, <em>replacement text</em><span class="sig-paren">)</span><a class="headerlink" href="#regexp_replace" title="Permalink to this definition">¶</a></dt> +<dd><p>Replaces substrings matched to a given regular expression pattern</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> +<li><strong>string</strong> – </li> +<li><strong>pattern</strong> – </li> +<li><strong>replacement</strong> – </li> +</ul> +</td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">text</p> +</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre>select regexp_replace(âabcdefâ, â(Ëab|ef$)â, âââ); +> âcdâ +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="upper"> +<code class="descname">upper</code><span class="sig-paren">(</span><em>string text</em><span class="sig-paren">)</span><a class="headerlink" href="#upper" title="Permalink to this definition">¶</a></dt> +<dd><p>makes an input text to be upper case</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>string</strong> – </td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">text</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="k">upper</span><span class="p">(</span><span class="s1">'tajo'</span><span class="p">);</span> +<span class="o">></span> <span class="n">TAJO</span> +</pre></div> +</div> +</dd></dl> + +<dl class="function"> +<dt id="lower"> +<code class="descname">lower</code><span class="sig-paren">(</span><em>string text</em><span class="sig-paren">)</span><a class="headerlink" href="#lower" title="Permalink to this definition">¶</a></dt> +<dd><p>makes an input text to be lower case</p> +<table class="docutils field-list" frame="void" rules="none"> +<col class="field-name" /> +<col class="field-body" /> +<tbody valign="top"> +<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>string</strong> – </td> +</tr> +<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">text</td> +</tr> +<tr class="field-odd field"><th class="field-name">Example:</th><td class="field-body"></td> +</tr> +</tbody> +</table> +<div class="highlight-sql"><div class="highlight"><pre><span class="k">select</span> <span class="k">lower</span><span class="p">(</span><span class="s1">'TAJO'</span><span class="p">);</span> +<span class="o">></span> <span class="n">tajo</span> +</pre></div> +</div> +</dd></dl> + +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="datetime_func_and_operators.html" class="btn btn-neutral float-right" title="DateTime Functions and Operators"/>Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="math_func_and_operators.html" class="btn btn-neutral" title="Math Functions and Operators"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014, Apache Tajo Team. + </p> + </div> + + <a href="https://github.com/snide/sphinx_rtd_theme";>Sphinx theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a> +</footer> + </div> + </div> + + </section> + + </div> + + + + 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