docs/topics/impala_refresh_functions.xml

<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="refresh">

  <title>REFRESH FUNCTIONS Statement</title>

  <titlealts audience="PDF">

    <navtitle>REFRESH FUNCTIONS</navtitle>

  </titlealts>

  <prolog>
    <metadata>
      <data name="Category" value="Impala"/>
      <data name="Category" value="SQL"/>
      <data name="Category" value="DDL"/>
      <data name="Category" value="Tables"/>
      <data name="Category" value="Hive"/>
      <data name="Category" value="Metastore"/>
      <data name="Category" value="ETL"/>
      <data name="Category" value="Ingest"/>
      <data name="Category" value="Developers"/>
      <data name="Category" value="Data Analysts"/>
    </metadata>
  </prolog>

  <conbody>

    <p>
      In <keyword keyref="impala29_full"/> and higher, you can run the <codeph>REFRESH
      FUNCTIONS</codeph> statement to refresh the user-defined functions (UDFs) created outside
      of Impala. For example, you can add Java-based UDFs to the metastore database through the
      Hive <codeph>CREATE FUNCTION</codeph> statements and make those UDFs visible to Impala at
      the database level by subsequently running <codeph>REFRESH FUNCTIONS</codeph>.
    </p>

    <p>
      The <codeph>REFRESH FUNCTIONS</codeph> statement is only required if you create or modify
      UDFs from outside of Impala. Updated metadata, as a result of running <codeph>REFRESH
      FUNCTIONS</codeph>, is broadcast to all Impala coordinators.
    </p>

    <p>
      Once issued, the <codeph>REFRESH FUNCTIONS</codeph> statement cannot be cancelled.
    </p>

    <p conref="../shared/impala_common.xml#common/syntax_blurb">
      <ph rev="2.9.0 IMPALA-5259"> <codeph>REFRESH FUNCTIONS <varname>db_name</varname></codeph>
      </ph>
    </p>

    <p>
      <ph rev="2.9.0 IMPALA-5259"><codeph>REFRESH FUNCTIONS</codeph>
      <varname>db_name</varname></ph>
    </p>

  </conbody>

</concept>