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| <meta name="DC.Title" content="REFRESH_UPDATED_HMS_PARTITIONS Query Option" /> |
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| <title>REFRESH_UPDATED_HMS_PARTITIONS Query Option</title> |
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| <h1 class="title topictitle1" id="ariaid-title1">REFRESH_UPDATED_HMS_PARTITIONS Query Option</h1> |
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| <p class="p"> |
| As the name implies the query option <code class="ph codeph">REFRESH_UPDATED_HMS_PARTITIONS</code> is used |
| to refresh any updated HMS partitions. |
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| <p class="p">This option is disabled by default so that the performance is not compromised when refreshing a |
| table. However, for certain corner case scenarios refresh table command does not detect changed |
| partitions. In case of the default refresh, catalogd detects, adds any new partitions and removes |
| any partitions which are not present in HMS anymore. However, it does not update any partitions |
| that changed (eg. change of location). When this query option is enabled, the refresh table |
| command will detect certain changes to the partitions and update them accordingly. Currently, |
| catalogd will update the partitions if any of the following StorageDescriptor properties have |
| been modified. 1. Partition Location 2. Partition Fileformat. 3 SerdeInfo. 4. Partition schema |
| changes. 5. Partition bucketInfo.</p> |
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| <p class="p"> |
| <strong class="ph b">Type:</strong><code class="ph codeph">BOOLEAN</code>; recognized values are 1 and 0, or true and false; any other |
| value will be interpreted as false. |
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| <strong class="ph b">Default:</strong><code class="ph codeph">FALSE</code> (shown as 0 in output of SET statement). |
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| <p class="p"><strong class="ph b">Added in:</strong> |
| <span class="keyword">Impala 4.0</span></p> |
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| <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../topics/impala_set.html">SET Statement</a></div> |
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