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| <h1 class="title topictitle1" id="ariaid-title1">DISABLE_ROW_RUNTIME_FILTERING Query Option (<span class="keyword">Impala 2.5</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">DISABLE_ROW_RUNTIME_FILTERING</code> query option |
| reduces the scope of the runtime filtering feature. Queries still dynamically prune |
| partitions, but do not apply the filtering logic to individual rows within partitions. |
| </p> |
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| <p class="p"> |
| Only applies to queries against Parquet tables. For other file formats, Impala |
| only prunes at the level of partitions, not individual rows. |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Type:</strong> Boolean; recognized values are 1 and 0, or <code class="ph codeph">true</code> and |
| <code class="ph codeph">false</code>; any other value interpreted as <code class="ph codeph">false</code> |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Default:</strong> <code class="ph codeph">false</code> |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Added in:</strong> <span class="keyword">Impala 2.5.0</span> |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Usage notes:</strong> |
| </p> |
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| <p class="p"> |
| Impala automatically evaluates whether the per-row filters are being |
| effective at reducing the amount of intermediate data. Therefore, |
| this option is typically only needed for the rare case where Impala |
| cannot accurately determine how effective the per-row filtering is |
| for a query. |
| </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"> |
| Because this setting only improves query performance in very specific |
| circumstances, depending on the query characteristics and data distribution, |
| only use it when you determine through benchmarking that it improves |
| performance of specific expensive queries. |
| Consider setting this query option immediately before the expensive query and |
| unsetting it immediately afterward. |
| </p> |
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| <p class="p"> |
| <strong class="ph b">File format considerations:</strong> |
| </p> |
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| <p class="p"> |
| This query option only applies to queries against HDFS-based tables |
| using the Parquet file format. |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Kudu considerations:</strong> |
| </p> |
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| <p class="p"> |
| When applied to a query involving a Kudu table, this option turns off |
| all runtime filtering for the Kudu table. |
| </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> |
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| </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_set.html">SET Statement</a></div> |
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