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<p>An array type can be created by applying the <code>ARRAY</code> suffix to another

type. For example <code>INT ARRAY</code> is an array of integers. Array indexes

start from 1. Array sizes are limited to 2^31 elements. Array values

be nullable types, e.g., <code>INT ARRAY NULL</code>. Multidimensional arrays

are possible, e.g. <code>VARCHAR ARRAY ARRAY</code> is a two-dimensional array.</p>

<p>In <code>CREATE TABLE</code> and <code>CREATE TYPE</code> declarations there is no way to

specify the nullability of the elements of an <code>ARRAY</code>. The compiler

will always assume that array elements are nullable:</p>

<p>Table <code>T</code> will have a single column <code>a</code> whose values are nullable

arrays; the array elements will be nullable INT values.</p>

<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="array-literals">Array literals<a href="#array-literals" class="hash-link" aria-label="Direct link to Array literals" title="Direct link to Array literals" translate="no"></a></h2>

<p>Array literals have the syntax <code>ARRAY[</code>expr [<code>,</code>expr]*<code>]</code>. An example

creating a nested array is: <code>ARRAY[ARRAY[1, 2], ARRAY[3, 4]]</code>.</p>

<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="the-unnest-sql-operator">The <code>UNNEST</code> SQL Operator<a href="#the-unnest-sql-operator" class="hash-link" aria-label="Direct link to the-unnest-sql-operator" title="Direct link to the-unnest-sql-operator" translate="no"></a></h2>

<p>The <code>UNNEST</code> operator takes an <code>ARRAY</code> and returns a table with a

row for each element in the <code>ARRAY</code>: <code>UNNEST(ARRAY) [WITH ORDINALITY]</code>. If the input is an array with 5 elements, the output

is a table with 5 rows, each row holding one element of the array.

The additional keyword <code>WITH ORDINALITY</code> creates an output table

with two columns, where the second column is the index of the element

within the array, with numbering starting at 1. If the array contains

duplicated values, the resulting table will be a multiset.</p>

<p>The <code>UNNEST</code> operator can be used in self-joins as follows:</p>

<div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">CREATE</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">TABLE</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">data</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">CITIES </span><span class="token keyword" style="color:#00009f">VARCHAR</span><span class="token plain"> ARRAY</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> COUNTRY </span><span class="token keyword" style="color:#00009f">VARCHAR</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">CREATE</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">VIEW</span><span class="token plain"> V </span><span class="token keyword" style="color:#00009f">AS</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">SELECT</span><span class="token plain"> city</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> country</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">FROM</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">data</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> UNNEST</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">cities</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">AS</span><span class="token plain"> t </span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">city</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre></div></div>

<p>The previous query is a shortcut for a CROSS-JOIN query:</p>

<div class="language-sql codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_QJqH"><pre tabindex="0" class="prism-code language-sql codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">CREATE</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">VIEW</span><span class="token plain"> V </span><span class="token keyword" style="color:#00009f">AS</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">SELECT</span><span class="token plain"> city</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">data</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">country</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">FROM</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">data</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">CROSS</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">JOIN</span><span class="token plain"> UNNEST</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">data</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">cities</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">AS</span><span class="token plain"> city</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre></div></div>

<p><code>UNNEST</code> applied to a <code>NULL</code> value returns an empty table.</p>

<p>Note that applying <code>UNNEST</code> to an <code>ARRAY</code> of structure-typed objects

will produce a collection whose columns are the fields of the

structure, instead of a collection with a single structure-typed

column.</p>

<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="comparison-operations-on-arrays">Comparison Operations on Arrays<a href="#comparison-operations-on-arrays" class="hash-link" aria-label="Direct link to Comparison Operations on Arrays" title="Direct link to Comparison Operations on Arrays" translate="no"></a></h2>

<p>Comparison operations (<code>=</code>, <code><></code>, <code>!=</code>, <code>></code>, <code><</code>, <code>>=</code>, <code><=</code>) in arrays occur <strong>lexicographically</strong>, from left to right. The elements are compared one by one until a difference is found. Arrays can be compared even if they are different in size.</p>

<p><strong>Examples:</strong></p>

<ul>

</ul>

<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="predefined-functions-on-array-values">Predefined functions on array values<a href="#predefined-functions-on-array-values" class="hash-link" aria-label="Direct link to Predefined functions on array values" title="Direct link to Predefined functions on array values" translate="no"></a></h2>

<table><thead><tr><th>Function</th><th>Description</th><th>Example</th></tr></thead><tbody><tr><td><em>array</em><code>[</code><em>index</em><code>]</code></td><td>where <em>index</em> is an expression that evaluates to an integer, and <em>array</em> is an expression that evaluates to an array. Returns the element at the specified position. If the index is out of bounds, the result is <code>NULL</code>.</td><td><code>ARRAY[2,3][2]</code> => 3</td></tr><tr><td><a id="safe_offset"></a><em>array</em><code>[SAFE_OFFSET(</code><em>index</em><code>)]</code></td><td>where <em>index</em> is an expression that evaluates to an integer, and <em>array</em> is an expression that evaluates to an array. Returns the element at the specified position, with first element at index 0. If the index is out of bounds, the result is <code>NULL</code>.</td><td><code>ARRAY[2,3][SAFE_OFFSET(2)]</code> => NULL</td></tr><tr><td><a id="constructor"></a><code>ARRAY(</code> [ exp [, exp]* ]<code>)</code></td><td>Array constructor function. Can have zero arguments.</td><td><code>ARRAY()</code> => <code>[]</code>, <code>ARRAY(NULL, 2)</code> => <code>[NULL, 2]</code></td></tr><tr><td><a id="append"></a><code>ARRAY_APPEND(</code> <em>array</em> <code>, </code> <em>element</em> <code>)</code></td><td>Appends an element to the end of the array and returns the result. If the array is <code>NULL</code>, the function will return <code>NULL</code>. If the <em>element</em> is <code>NULL</code>, the <code>NULL</code> element will be added to the end of the array.</td><td><code>ARRAY_APPEND(ARRAY [1, 2], 3)</code> => <code>[1, 2, 3]</code></td></tr><tr><td><a id="concat"></a><code>ARRAY_CONCAT(</code> <em>array</em>, [ <em>array</em> ]* <code>)</code></td><td>Returns <code>NULL</code> if any argument is <code>NULL</code>. Concatenates a list of arrays.</td><td><code>ARRAY_CONCAT(ARRAY [1, 2, 3], ARRAY[4])</code> => <code>[1, 2, 3, 4]</code></td></tr><tr><td><a id="compact"></a><code>ARRAY_COMPACT(</code> <em>array</em> <code>)</code></td><td>Returns <code>NULL</code> if <em>array</em> is <code>NULL</code>. Returns a new array by removing all the <code>NULL</code> values from the <em>array</em>.</td><td><code>ARRAY_COMPACT(ARRAY [1, 2, 3, NULL])</code> => <code>[1, 2, 3]</code></td></tr><tr><td><a id="contains"></a><a id="contains"></a><code>ARRAY_CONTAINS(</code> <em>array</em> <code>, </code> <em>element</em> <code>)</code></td><td>The right argument must have the same type as array elements. Returns true if the <em>array</em> contains the <em>element</em>.</td><td><code>ARRAY_CONTAINS(ARRAY [1, 2, 3], 2)</code> => true</td></tr><tr><td><a id="distinct"></a><code>ARRAY_DISTINCT(</code> <em>array</em> <code>)</code></td><td>Returns <code>NULL</code> if <em>array</em> is <code>NULL</code>. Returns a new array removing duplicate values from the <em>array</em> and keeping the order of elements.</td><td><code>ARRAY_DISTINCT(ARRAY [1, 1, 2, 2])</code> => <code>[1, 2]</code></td></tr><tr><td><a id="except"></a><code>ARRAY_EXCEPT(</code> <em>left</em>, <em>right</em> <code>)</code></td><td>Returns <code>NULL</code> if any argument is <code>NULL</code>. Returns an array with all elements in the <em>left</em> array that do not appear in the <em>right</em> array, removing duplicates.</td><td><code>ARRAY_EXCEPT(ARRAY [1, 2, 3], ARRAY [3,1,4])</code> => <code>[2]</code></td></tr><tr><td><a id="array_exists"></a><code>ARRAY_EXISTS(</code> <em>array</em>, <em>predicate</em> <code>)</code></td><td><em>predicate</em> is a lambda expression with an argument that has the array element type, returning a Boolean. <code>ARRAY_EXISTS</code> returns <code>true</code> when the predicate returns <code>true</code> for at least one element. If the array is empty, returns <code>false</code>. If the result is not true and the predicate evaluates to NULL for any element, it returns NULL.</td><td><code>ARRAY_EXISTS(ARRAY[1, -2, 3], x -> x > 0)</code> => true</td></tr><tr><td><a id="insert"></a><code>ARRAY_INSERT(</code> <em>array</em>, <em>pos</em>, <em>element</em> <code>)</code></td><td>Returns <code>NULL</code> if <em>array</em> or <em>pos</em> are <code>NULL</code>. Insert <em>element</em> in array at specified position, padding with <code>NULL</code>s if necessary. If <em>pos</em> is negative, it is considered from the end of the array. Produces error when <em>pos</em> is zero or very large</td><td><code>ARRAY_INSERT(ARRAY [1, 2, 3], 3, 4)</code> => <code>[1,2,4,3]</code></td></tr><tr><td><a id="intersect"></a><code>ARRAY_INTERSECT(</code> <em>left</em>, <em>right</em> <code>)</code></td><td>Returns <code>NULL</code> if any argument is <code>NULL</code>. Returns an array with all elements that appear in common in both the <em>left</em> array and <em>right</em> arrays, with no duplicates.</td><td><code>ARRAY_INTERSECT(ARRAY [1, 2, 3], ARRAY [3,1,4])</code> => <code>[1,3]</code></td></tr><tr><td><a id="join"></a><code>ARRAY_JOIN</code></td><td>Another name for <code>ARRAY_TO_STRING</code></td><td></td></tr><tr><td><a id="length"></a><code>ARRAY_LENGTH(</code> <em>array</em> <code>)</code></td><td>Another name for <code>CARDINALITY</code></td><td><code>ARRAY_LENGTH( ARRAY [1, 2, 3])</code> => <code>3</code></td></tr><tr><td><a id="max"></a><code>ARRAY_MAX(</code> <em>array</em> <code>)</code></td><td>Returns the maximum value in the <em>array</em></td><td><code>ARRAY_MAX(ARRAY [9, 1, 2, 4, 8, null])</code> => 9</td></tr><tr><td><a id="min"></a><code>ARRAY_MIN(</code> <em>array</em> <code>)</code></td><td>Returns the minimum value in the <em>array</em>. Ignores null values.</td><td><code>ARRAY_MIN(ARRAY [9, 1, 2, 5, 8, null])</code> => 1</td></tr><tr><td><a id="overlap"></a><code>ARRAYS_OVERLAP(</code> <em>array1</em> <code>, </code> <em>array2</em> <code>)</code></td><td>Returns <code>NULL</code> if <em>array1</em> or <em>array2</em> is <code>NULL</code>. Errors if the two arrays are of different types. Returns true if the two arrays have at least one element in common.</td><td><code>ARRAYS_OVERLAP(ARRAY [1, 2, 3], ARRAY [3, 4, 5])</code> => true</td></tr><tr><td><a id="position"></a><code>ARRAY_POSITION(</code> <em>array</em> <code>, </code> <em>element</em> <code>)</code></td><td>Returns <code>NULL</code> if <em>array</em> is <code>NULL</code>. The right argument must have the same type as array elements. Returns the (1-based) index of the first <em>element</em> of the <em>array</em> as a long. Returns 0 if <em>element</em> doesn't exist in <em>array</em>.</td><td><code>ARRAY_POSITION(ARRAY [1, 3, 4, 6], 4)</code> => 3</td></tr><tr><td><a id="prepend"></a><code>ARRAY_PREPEND(</code> <em>array</em> <code>, </code> <em>element</em> <code>)</code></td><td>Prepends an element to the start of the array and returns the result. If the array is <code>NULL</code>, the function will return <code>NULL</code>. If the element is <code>NULL</code>, the <code>NULL</code> element will be added to the start of the array.</td><td><code>ARRAY_PREPEND(ARRAY [2, 3], 1)</code> => <code>[1, 2, 3]</code></td></tr><tr><td><a id="remove"></a><code>ARRAY_REMOVE(</code> <em>array</em> <code>, </code> <em>element</em> <code>)</code></td><td>Returns <code>NULL</code> if <em>array</em> is <code>NULL</code>. The right argument must have the same type as array elements. Returns a new array removing all elements that are equal to <em>element</em> from the given <em>array</em>.</td><td><code>ARRAY_REMOVE(ARRAY [2, 2, 6, 8], 2)</code> => <code>[6, 8]</code></td></tr><tr><td><a id="reverse"></a><code>ARRAY_REVERSE(</code> <em>array</em> <code>)</code></td><td>Returns <code>NULL</code> if <em>array</em> is <code>NULL</code>. Returns array with the elements in reverse order.</td><td><code>ARRAY_REVERSE(ARRAY [2, 2, 6, 8])</code> => <code>[8, 6, 2, 2]</code></td></tr><tr><td><a id="repeat"></a><code>ARRAY_REPEAT(</code> <em>element</em> <code>, </code> <em>count</em> <code>)</code></td><td>Returns the array containing <em>element</em> <em>count</em> times. If <em>count</em> is negative, an empty array is returned. If <em>count</em> is <code>NULL</code>, <code>NULL</code> is returned. If <em>element</em> is <code>NULL</code>, an array containing <em>count</em> number of <code>NULL</code>s is returned.</td><td><code>ARRAY_REPEAT(3, 4)</code> => <code>[3, 3, 3, 3]</code></td></tr><tr><td><a id="size"></a><code>ARRAY_SIZE(</code> <em>array</em> <code>)</code></td><td>Another name for <code>CARDINALITY</code></td><td><code>ARRAY_SIZE( ARRAY [1, 2, 3])</code> => <code>3</code></td></tr><tr><td><a id="to_string"></a><code>ARRAY_TO_STRING(</code> <em>array</em> <code>, </code> <em>separator</em> [<code>, </code> <em>null_string</em> ]<code>)</code></td><td>Concatenates the values of the string array <em>array</em>, separated by the <em>separator</em> string. If <em>null_string</em> is given and is not <code>NULL</code>, then <code>NULL</code> array entries are represented by that string; otherwise, they are omitted.</td><td><code>ARRAY_TO_STRING(ARRAY[1, 2, 3, NULL, 5], ',', '*')</code> => <code>1,2,3,*,5</code></td></tr><tr><td><a id="union"></a><code>ARRAY_UNION(</code> <em>left</em>, <em>right</em> <code>)</code></td><td>Returns <code>NULL</code> if any argument is <code>NULL</code>. Returns an array with all elements that either in the <em>left</em> array or the <em>right</em> arrays, with no duplicates.</td><td><code>ARRAY_UNION(ARRAY [1, 2, 3], ARRAY [3,1,4])</code> => <code>[1,2,3,4]</code></td></tr><tr><td><a id="cardinality"></a><code>CARDINALITY(</code> <em>array</em> <code>)</code></td><td>Returns the size of the <em>array</em> expression (number of elements).</td><td><code>CARDINALITY(ARRAY[2,3])</code> => 2</td></tr><tr><td><a id="element"></a><code>ELEMENT(</code> <em>array</em> <code>)</code></td><td>Returns the single element of an <em>array</em> of any type. If the array has zero elements, returns <code>NULL</code>. If the array has more than one element, it causes a runtime exception.</td><td><code>ELEMENT(ARRAY[2])</code> => 2</td></tr><tr><td><a id="sort"></a><code>SORT_ARRAY(</code> <em>array</em> <code>, [</code> <em>ascendingOrder</em> <code>])</code></td><td>Returns a new array, sorted in ascending (<em>ascendingOrder</em> is <code>true</code>) or descending order (<em>ascendingOrder</em> is <code>false</code>) according to the natural ordering of the array elements. The default order is ascending if ascendingOrder is not specified. Null elements are considered to be the smallest.</td><td><code>SORT_ARRAY(ARRAY [4, 7, 1, null])</code> => <code>[null, 1, 4, 7]</code></td></tr><tr><td><a id="transform"></a><code>TRANSFORM(</code> <em>array</em>, <em>function</em> <code>)</code></td><td><em>function</em> is a lambda expression with an argument that has the array element type. <code>TRANSFORM</code> returns a new array constructed by applying the function to every element of <em>array</em>. If <em>array</em> is NULL, it returns NULL</td><td><code>TRANSFORM(ARRAY[1, 2, 3], x -> x % 2)</code> => <code>[1, 0, 1]</code></td></tr></tbody></table></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/sql/aggregates"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Aggregate Operations</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/sql/binary"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Binary (Byte Array) Operations</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#array-literals" class="table-of-contents__link toc-highlight">Array literals</a></li><li><a href="#the-unnest-sql-operator" class="table-of-contents__link toc-highlight">The <code>UNNEST</code> SQL Operator</a></li><li><a href="#comparison-operations-on-arrays" class="table-of-contents__link toc-highlight">Comparison Operations on Arrays</a></li><li><a href="#predefined-functions-on-array-values" class="table-of-contents__link toc-highlight">Predefined functions on array values</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title">Docs</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/get-started">Get Started</a></li><li class="footer__item"><a class="footer__link-item" href="/tutorials/basics/part1">Tutorial</a></li><li class="footer__item"><a class="footer__link-item" href="/sql/intro">SQL Reference</a></li></ul></div><div class="theme-layout-footer-column col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://join.slack.com/t/felderacommunity/shared_invite/zt-222bq930h-dgsu5IEzAihHg8nQt~dHzA" target="_blank" rel="noopener noreferrer" class="footer__link-item">Slack<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li><li class="footer__item"><a href="https://discord.com/invite/s6t5n9UzHE" target="_blank" rel="noopener noreferrer" class="footer__link-item">Discord<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li><li class="footer__item"><a href="https://bsky.app/profile/feldera.bsky.social" target="_blank" rel="noopener noreferrer" class="footer__link-item">Bluesky<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li></ul></div><div class="theme-layout-footer-column col footer__col"><div class="footer__title">More</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://github.com/feldera/feldera" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2026 Feldera Inc.</div></div></div></footer></div>

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