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| <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
| <concept id="disable_row_runtime_filtering" rev="2.5.0"> |
| |
| <title>DISABLE_ROW_RUNTIME_FILTERING Query Option (<keyword keyref="impala25"/> or higher only)</title> |
| <titlealts audience="PDF"><navtitle>DISABLE_ROW_RUNTIME_FILTERING</navtitle></titlealts> |
| <prolog> |
| <metadata> |
| <data name="Category" value="Impala"/> |
| <data name="Category" value="Impala Query Options"/> |
| <data name="Category" value="Performance"/> |
| <data name="Category" value="Developers"/> |
| <data name="Category" value="Data Analysts"/> |
| </metadata> |
| </prolog> |
| |
| <conbody> |
| |
| <p rev="2.5.0"> |
| <indexterm audience="hidden">DISABLE_ROW_RUNTIME_FILTERING query option</indexterm> |
| The <codeph>DISABLE_ROW_RUNTIME_FILTERING</codeph> 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> |
| |
| <p> |
| Only applies to queries against Parquet tables. For other file formats, Impala |
| only prunes at the level of partitions, not individual rows. |
| </p> |
| |
| <p conref="../shared/impala_common.xml#common/type_boolean"/> |
| <p conref="../shared/impala_common.xml#common/default_false"/> |
| |
| <p conref="../shared/impala_common.xml#common/added_in_250"/> |
| |
| <p conref="../shared/impala_common.xml#common/usage_notes_blurb"/> |
| |
| <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> |
| |
| <p conref="../shared/impala_common.xml#common/runtime_filtering_option_caveat"/> |
| |
| <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> |
| |
| <p conref="../shared/impala_common.xml#common/file_format_blurb"/> |
| |
| <p rev="2.11.0 IMPALA-4252"> |
| This query option only applies to queries against HDFS-based tables |
| using the Parquet file format. |
| </p> |
| |
| <p conref="../shared/impala_common.xml#common/kudu_blurb"/> |
| |
| <p rev="2.11.0 IMPALA-4252"> |
| When applied to a query involving a Kudu table, this option turns off |
| all runtime filtering for the Kudu table. |
| </p> |
| |
| <p conref="../shared/impala_common.xml#common/related_info"/> |
| <p> |
| <xref href="impala_runtime_filtering.xml"/>, |
| <xref href="impala_runtime_filter_mode.xml#runtime_filter_mode"/> |
| <!-- , <xref href="impala_partitioning.xml#dynamic_partition_pruning"/> --> |
| </p> |
| |
| </conbody> |
| </concept> |