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1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Querying</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Druid SQL</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Array functions</span><meta itemprop="position" content="3"></li></ul></nav><div class="theme-doc-markdown markdown"><header><h1>SQL ARRAY functions</h1></header><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>info</div><div class="admonitionContent_S0QG"><p> Apache Druid supports two query languages: Druid SQL and <a href="/docs/latest/querying/">native queries</a>. |
| This document describes the SQL language.</p></div></div><p>This page describes the operations you can perform on arrays using <a href="/docs/latest/querying/sql">Druid SQL</a>. See <a href="/docs/latest/querying/sql-data-types#arrays"><code>ARRAY</code> data type documentation</a> for additional details. </p><p>All array references in the array function documentation can refer to multi-value string columns or <code>ARRAY</code> literals. |
| These functions are largely identical to the <a href="/docs/latest/querying/sql-multivalue-string-functions">multi-value string functions</a>, but |
| use <code>ARRAY</code> types and behavior. Multi-value string <code>VARCHAR</code> columns can be converted to <code>VARCHAR ARRAY</code> to use with |
| these functions using <code>MV_TO_ARRAY</code>, and <code>ARRAY</code> types can be converted to multi-value string <code>VARCHAR</code> with |
| <code>ARRAY_TO_MV</code>.</p><p>The following table describes array functions. To learn more about array aggregation functions, see <a href="/docs/latest/querying/sql-aggregations">SQL aggregation functions</a>.</p><table><thead><tr><th>Function</th><th>Description</th></tr></thead><tbody><tr><td><code>ARRAY[expr1, expr2, ...]</code></td><td>Constructs a SQL <code>ARRAY</code> literal from the expression arguments, using the type of the first argument as the output array type.</td></tr><tr><td><code>ARRAY_LENGTH(arr)</code></td><td>Returns length of the array expression.</td></tr><tr><td><code>ARRAY_OFFSET(arr, long)</code></td><td>Returns the array element at the 0-based index supplied, or null for an out of range index.</td></tr><tr><td><code>ARRAY_ORDINAL(arr, long)</code></td><td>Returns the array element at the 1-based index supplied, or null for an out of range index.</td></tr><tr><td><code>ARRAY_CONTAINS(arr, expr)</code></td><td>If <code>expr</code> is a scalar type, returns 1 if <code>arr</code> contains <code>expr</code>. If <code>expr</code> is an array, returns 1 if <code>arr</code> contains all elements of <code>expr</code>. Otherwise returns 0.</td></tr><tr><td><code>ARRAY_OVERLAP(arr1, arr2)</code></td><td>Returns 1 if <code>arr1</code> and <code>arr2</code> have any elements in common, else 0.</td></tr><tr><td><code>ARRAY_OFFSET_OF(arr, expr)</code></td><td>Returns the 0-based index of the first occurrence of <code>expr</code> in the array. If no matching elements exist in the array, returns <code>null</code> or <code>-1</code> if <code>druid.generic.useDefaultValueForNull=true</code> (legacy mode).</td></tr><tr><td><code>ARRAY_ORDINAL_OF(arr, expr)</code></td><td>Returns the 1-based index of the first occurrence of <code>expr</code> in the array. If no matching elements exist in the array, returns <code>null</code> or <code>-1</code> if <code>druid.generic.useDefaultValueForNull=true</code> (legacy mode).</td></tr><tr><td><code>ARRAY_PREPEND(expr, arr)</code></td><td>Adds <code>expr</code> to the beginning of <code>arr</code>, the resulting array type determined by the type of <code>arr</code>.</td></tr><tr><td><code>ARRAY_APPEND(arr, expr)</code></td><td>Appends <code>expr</code> to <code>arr</code>, the resulting array type determined by the type of <code>arr</code>.</td></tr><tr><td><code>ARRAY_CONCAT(arr1, arr2)</code></td><td>Concatenates <code>arr2</code> to <code>arr1</code>. The resulting array type is determined by the type of <code>arr1</code>.</td></tr><tr><td><code>ARRAY_SLICE(arr, start, end)</code></td><td>Returns the subarray of <code>arr</code> from the 0-based index <code>start</code> (inclusive) to <code>end</code> (exclusive). Returns <code>null</code>, if <code>start</code> is less than 0, greater than length of <code>arr</code>, or greater than <code>end</code>.</td></tr><tr><td><code>ARRAY_TO_STRING(arr, str)</code></td><td>Joins all elements of <code>arr</code> by the delimiter specified by <code>str</code>.</td></tr><tr><td><code>STRING_TO_ARRAY(str1, str2)</code></td><td>Splits <code>str1</code> into an array on the delimiter specified by <code>str2</code>, which is a regular expression.</td></tr><tr><td><code>ARRAY_TO_MV(arr)</code></td><td>Converts an <code>ARRAY</code> of any type into a multi-value string <code>VARCHAR</code>.</td></tr></tbody></table></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/latest/querying/sql-aggregations"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Aggregation functions</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/querying/sql-multivalue-string-functions"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Multi-value string functions</div></a></nav></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. Except where otherwise noted, licensed under CC BY-SA 4.0. Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></div></footer></div> |
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