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| <meta name="DC.Title" content="RUNTIME_FILTER_MIN_SIZE Query Option (Impala 2.6 or higher only)" /> |
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| <title>RUNTIME_FILTER_MIN_SIZE Query Option (Impala 2.6 or higher only)</title> |
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| <h1 class="title topictitle1" id="ariaid-title1">RUNTIME_FILTER_MIN_SIZE Query Option (<span class="keyword">Impala 2.6</span> or higher only)</h1> |
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| <div class="body conbody"> |
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| <p class="p"> |
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| The <code class="ph codeph">RUNTIME_FILTER_MIN_SIZE</code> query option |
| adjusts the settings for the runtime filtering feature. |
| This option defines the minimum size for a filter, |
| no matter what the estimates produced by the planner are. |
| This value also overrides any lower number specified for the |
| <code class="ph codeph">RUNTIME_BLOOM_FILTER_SIZE</code> query option. |
| Filter sizes are rounded up to the nearest power of two. |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Type:</strong> integer |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Default:</strong> 0 (meaning use the value from the corresponding <span class="keyword cmdname">impalad</span> startup option) |
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| <p class="p"> |
| <strong class="ph b">Added in:</strong> <span class="keyword">Impala 2.6.0</span> |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Usage notes:</strong> |
| </p> |
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| <p class="p"> |
| Because the runtime filtering feature applies mainly to resource-intensive and |
| long-running queries, only adjust this query option when tuning long-running queries |
| involving some combination of large partitioned tables and joins involving large tables. |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Kudu considerations:</strong> |
| </p> |
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| <p class="p"> |
| This query option affects only Bloom filters, not the min/max filters that are applied |
| to Kudu tables. Therefore, it does not affect the performance of queries against Kudu |
| tables. |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Related information:</strong> |
| </p> |
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| <p class="p"> |
| <a class="xref" href="impala_runtime_filtering.html">Runtime Filtering for Impala Queries (Impala 2.5 or higher only)</a>, |
| <a class="xref" href="impala_runtime_filter_mode.html#runtime_filter_mode">RUNTIME_FILTER_MODE Query Option (Impala 2.5 or higher only)</a>, |
| <a class="xref" href="impala_runtime_filter_max_size.html#runtime_filter_max_size">RUNTIME_FILTER_MAX_SIZE Query Option (Impala 2.6 or higher only)</a>, |
| <a class="xref" href="impala_runtime_bloom_filter_size.html#runtime_bloom_filter_size">RUNTIME_BLOOM_FILTER_SIZE Query Option (Impala 2.5 or higher only)</a> |
| </p> |
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| </div> |
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| <div class="related-links"> |
| <div class="familylinks"> |
| <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../topics/impala_query_options.html">Query Options for the SET Statement</a></div> |
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