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| <main id="main" class="col-md-9"><div class="page-header"> |
| <img src="" class="logo" alt=""><h1>Select</h1> |
| |
| <div class="d-none name"><code>select.Rd</code></div> |
| </div> |
| |
| <div class="ref-description section level2"> |
| <p>Selects a set of columns with names or Column expressions.</p> |
| </div> |
| |
| <div class="section level2"> |
| <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2> |
| <div class="sourceCode"><pre><code>select(x, col, ...) |
| |
| # S4 method for SparkDataFrame |
| $(x, name) |
| |
| # S4 method for SparkDataFrame |
| $(x, name) <- value |
| |
| # S4 method for SparkDataFrame,character |
| select(x, col, ...) |
| |
| # S4 method for SparkDataFrame,Column |
| select(x, col, ...) |
| |
| # S4 method for SparkDataFrame,list |
| select(x, col)</code></pre></div> |
| </div> |
| |
| <div class="section level2"> |
| <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2> |
| <dl><dt>x</dt> |
| <dd><p>a SparkDataFrame.</p></dd> |
| |
| |
| <dt>col</dt> |
| <dd><p>a list of columns or single Column or name.</p></dd> |
| |
| |
| <dt>...</dt> |
| <dd><p>additional column(s) if only one column is specified in <code>col</code>. |
| If more than one column is assigned in <code>col</code>, <code>...</code> |
| should be left empty.</p></dd> |
| |
| |
| <dt>name</dt> |
| <dd><p>name of a Column (without being wrapped by <code>""</code>).</p></dd> |
| |
| |
| <dt>value</dt> |
| <dd><p>a Column or an atomic vector in the length of 1 as literal value, or <code>NULL</code>. |
| If <code>NULL</code>, the specified Column is dropped.</p></dd> |
| |
| </dl></div> |
| <div class="section level2"> |
| <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2> |
| |
| |
| <p>A new SparkDataFrame with selected columns.</p> |
| </div> |
| <div class="section level2"> |
| <h2 id="note">Note<a class="anchor" aria-label="anchor" href="#note"></a></h2> |
| <p>$ since 1.4.0</p> |
| <p>$<- since 1.4.0</p> |
| <p>select(SparkDataFrame, character) since 1.4.0</p> |
| <p>select(SparkDataFrame, Column) since 1.4.0</p> |
| <p>select(SparkDataFrame, list) since 1.4.0</p> |
| </div> |
| <div class="section level2"> |
| <h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2> |
| <div class="dont-index"><p>Other SparkDataFrame functions: |
| <code><a href="SparkDataFrame.html">SparkDataFrame-class</a></code>, |
| <code><a href="summarize.html">agg</a>()</code>, |
| <code><a href="alias.html">alias</a>()</code>, |
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| <code><a href="as.data.frame.html">as.data.frame</a>()</code>, |
| <code><a href="attach.html">attach,SparkDataFrame-method</a></code>, |
| <code><a href="broadcast.html">broadcast</a>()</code>, |
| <code><a href="cache.html">cache</a>()</code>, |
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| <p>Other subsetting functions: |
| <code><a href="filter.html">filter</a>()</code>, |
| <code><a href="subset.html">subset</a>()</code></p></div> |
| </div> |
| |
| <div class="section level2"> |
| <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2> |
| <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="kw">if</span> <span class="op">(</span><span class="cn">FALSE</span><span class="op">)</span> <span class="op">{</span></span></span> |
| <span class="r-in"><span> <span class="fu">select</span><span class="op">(</span><span class="va">df</span>, <span class="st">"*"</span><span class="op">)</span></span></span> |
| <span class="r-in"><span> <span class="fu">select</span><span class="op">(</span><span class="va">df</span>, <span class="st">"col1"</span>, <span class="st">"col2"</span><span class="op">)</span></span></span> |
| <span class="r-in"><span> <span class="fu">select</span><span class="op">(</span><span class="va">df</span>, <span class="va">df</span><span class="op">$</span><span class="va">name</span>, <span class="va">df</span><span class="op">$</span><span class="va">age</span> <span class="op">+</span> <span class="fl">1</span><span class="op">)</span></span></span> |
| <span class="r-in"><span> <span class="fu">select</span><span class="op">(</span><span class="va">df</span>, <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"col1"</span>, <span class="st">"col2"</span><span class="op">)</span><span class="op">)</span></span></span> |
| <span class="r-in"><span> <span class="fu">select</span><span class="op">(</span><span class="va">df</span>, <span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span><span class="va">df</span><span class="op">$</span><span class="va">name</span>, <span class="va">df</span><span class="op">$</span><span class="va">age</span> <span class="op">+</span> <span class="fl">1</span><span class="op">)</span><span class="op">)</span></span></span> |
| <span class="r-in"><span> <span class="co"># Similar to R data frames columns can also be selected using $</span></span></span> |
| <span class="r-in"><span> <span class="va">df</span><span class="op">[</span>,<span class="va">df</span><span class="op">$</span><span class="va">age</span><span class="op">]</span></span></span> |
| <span class="r-in"><span><span class="op">}</span></span></span> |
| </code></pre></div> |
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