forked from docs/doc-exports
Su, Xiaomeng
04d4597cf3
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com> Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
26 lines
2.5 KiB
HTML
26 lines
2.5 KiB
HTML
<a name="dli_08_0377"></a><a name="dli_08_0377"></a>
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<h1 class="topictitle1">CREATE FUNCTION</h1>
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<div id="body8662426"><div class="section" id="dli_08_0377__en-us_topic_0000001310015797_section12316122121119"><h4 class="sectiontitle">Syntax</h4><pre class="screen" id="dli_08_0377__en-us_topic_0000001310015797_screen12287201515117">CREATE FUNCTION
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[IF NOT EXISTS] function_name
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AS identifier [LANGUAGE JAVA|SCALA]</pre>
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</div>
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<div class="section" id="dli_08_0377__en-us_topic_0000001310015797_section1428412421113"><h4 class="sectiontitle">Function</h4><p id="dli_08_0377__en-us_topic_0000001310015797_p4736636121214">Create a user-defined function.</p>
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<p id="dli_08_0377__en-us_topic_0000001310015797_p31966494138">For details about how to create a user-defined function, see <a href="dli_08_0425.html#dli_08_0425">User-Defined Functions (UDFs)</a>.</p>
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</div>
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<div class="section" id="dli_08_0377__en-us_topic_0000001310015797_section20691410191215"><h4 class="sectiontitle">Description</h4><p id="dli_08_0377__en-us_topic_0000001310015797_p58431929121213"><strong id="dli_08_0377__en-us_topic_0000001310015797_b69401737191213">IF NOT EXISTS</strong></p>
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<p id="dli_08_0377__en-us_topic_0000001310015797_p38431529111219">If the function already exists, nothing happens.</p>
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<p id="dli_08_0377__en-us_topic_0000001310015797_p684302914129"><strong id="dli_08_0377__en-us_topic_0000001310015797_b1571664017125">LANGUAGE JAVA|SCALA</strong></p>
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<p id="dli_08_0377__en-us_topic_0000001310015797_p1784316298122">The language tag is used to instruct Flink runtime how to execute the function. Currently, only <strong id="dli_08_0377__en-us_topic_0000001310015797_b118783532445257">JAVA</strong> and <strong id="dli_08_0377__en-us_topic_0000001310015797_b15271306845257">SCALA</strong> language tags are supported, the default language for a function is <strong id="dli_08_0377__en-us_topic_0000001310015797_b9580054245257">JAVA</strong>.</p>
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</div>
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<div class="section" id="dli_08_0377__en-us_topic_0000001310015797_section238319459178"><h4 class="sectiontitle">Example</h4><p id="dli_08_0377__en-us_topic_0000001310015797_p93925450178">Create a function named <strong id="dli_08_0377__en-us_topic_0000001310015797_b80871179545257">STRINGBACK</strong>.</p>
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<pre class="screen" id="dli_08_0377__en-us_topic_0000001310015797_screen13393144514174">create function STRINGBACK as 'com.dli.StringBack'</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dli_08_0374.html">Data Definition Language (DDL)</a></div>
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</div>
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</div>
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