| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Miscellaneous functions for Column operations</title> |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> |
| <link rel="stylesheet" type="text/css" href="R.css" /> |
| |
| <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.3/styles/github.min.css"> |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.3/highlight.min.js"></script> |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.3/languages/r.min.js"></script> |
| <script>hljs.initHighlightingOnLoad();</script> |
| </head><body> |
| |
| <table width="100%" summary="page for column_misc_functions {SparkR}"><tr><td>column_misc_functions {SparkR}</td><td style="text-align: right;">R Documentation</td></tr></table> |
| |
| <h2>Miscellaneous functions for Column operations</h2> |
| |
| <h3>Description</h3> |
| |
| <p>Miscellaneous functions defined for <code>Column</code>. |
| </p> |
| |
| |
| <h3>Usage</h3> |
| |
| <pre> |
| crc32(x) |
| |
| hash(x, ...) |
| |
| md5(x) |
| |
| sha1(x) |
| |
| sha2(y, x) |
| |
| ## S4 method for signature 'Column' |
| crc32(x) |
| |
| ## S4 method for signature 'Column' |
| hash(x, ...) |
| |
| ## S4 method for signature 'Column' |
| md5(x) |
| |
| ## S4 method for signature 'Column' |
| sha1(x) |
| |
| ## S4 method for signature 'Column,numeric' |
| sha2(y, x) |
| </pre> |
| |
| |
| <h3>Arguments</h3> |
| |
| <table summary="R argblock"> |
| <tr valign="top"><td><code>x</code></td> |
| <td> |
| <p>Column to compute on. In <code>sha2</code>, it is one of 224, 256, 384, or 512.</p> |
| </td></tr> |
| <tr valign="top"><td><code>...</code></td> |
| <td> |
| <p>additional Columns.</p> |
| </td></tr> |
| <tr valign="top"><td><code>y</code></td> |
| <td> |
| <p>Column to compute on.</p> |
| </td></tr> |
| </table> |
| |
| |
| <h3>Details</h3> |
| |
| <p><code>crc32</code>: Calculates the cyclic redundancy check value (CRC32) of a binary column |
| and returns the value as a bigint. |
| </p> |
| <p><code>hash</code>: Calculates the hash code of given columns, and returns the result |
| as an int column. |
| </p> |
| <p><code>md5</code>: Calculates the MD5 digest of a binary column and returns the value |
| as a 32 character hex string. |
| </p> |
| <p><code>sha1</code>: Calculates the SHA-1 digest of a binary column and returns the value |
| as a 40 character hex string. |
| </p> |
| <p><code>sha2</code>: Calculates the SHA-2 family of hash functions of a binary column and |
| returns the value as a hex string. The second argument <code>x</code> specifies the number |
| of bits, and is one of 224, 256, 384, or 512. |
| </p> |
| |
| |
| <h3>Note</h3> |
| |
| <p>crc32 since 1.5.0 |
| </p> |
| <p>hash since 2.0.0 |
| </p> |
| <p>md5 since 1.5.0 |
| </p> |
| <p>sha1 since 1.5.0 |
| </p> |
| <p>sha2 since 1.5.0 |
| </p> |
| |
| |
| <h3>Examples</h3> |
| |
| <pre><code class="r">## Not run: |
| ##D # Dataframe used throughout this doc |
| ##D df <- createDataFrame(cbind(model = rownames(mtcars), mtcars)[, 1:2]) |
| ##D tmp <- mutate(df, v1 = crc32(df$model), v2 = hash(df$model), |
| ##D v3 = hash(df$model, df$mpg), v4 = md5(df$model), |
| ##D v5 = sha1(df$model), v6 = sha2(df$model, 256)) |
| ##D head(tmp) |
| ## End(Not run) |
| </code></pre> |
| |
| |
| <hr /><div style="text-align: center;">[Package <em>SparkR</em> version 2.3.1 <a href="00Index.html">Index</a>]</div> |
| </body></html> |
