| <?xml version="1.0" encoding="UTF-8"?> |
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| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
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| --> |
| <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
| <concept id="query_options"> |
| |
| <title>Query Options for the SET Statement</title> |
| <prolog> |
| <metadata> |
| <data name="Category" value="Impala Query Options"/> |
| <data name="Category" value="Impala"/> |
| <data name="Category" value="impala-shell"/> |
| <data name="Category" value="SQL"/> |
| <data name="Category" value="Querying"/> |
| <data name="Category" value="Configuring"/> |
| <data name="Category" value="Data Analysts"/> |
| <data name="Category" value="Developers"/> |
| </metadata> |
| </prolog> |
| |
| <conbody> |
| |
| <p> |
| You can specify the following options using the <codeph>SET</codeph> statement, and those settings affect all |
| queries issued from that session. |
| </p> |
| |
| <p> |
| Some query options are useful in day-to-day operations for improving usability, performance, or flexibility. |
| </p> |
| |
| <p> |
| Other query options control special-purpose aspects of Impala operation and are intended primarily for |
| advanced debugging or troubleshooting. |
| </p> |
| |
| <p> |
| Options with Boolean parameters can be set to 1 or <codeph>true</codeph> to enable, or 0 or <codeph>false</codeph> |
| to turn off. |
| </p> |
| |
| <note rev="2.0.0"> |
| <p rev="2.0.0"> |
| In Impala 2.0 and later, you can set query options directly through the JDBC and ODBC interfaces by using the |
| <codeph>SET</codeph> statement. Formerly, <codeph>SET</codeph> was only available as a command within the |
| <cmdname>impala-shell</cmdname> interpreter. |
| </p> |
| <p rev="2.11.0"> |
| In <keyword keyref="impala211_full"/> and later, you can set query options for an <cmdname>impala-shell</cmdname> session |
| by specifying one or more command-line arguments of the form |
| <codeph>--query_option=<varname>option</varname>=<varname>value</varname></codeph>. |
| See <xref keyref="shell_options"/> for details. |
| </p> |
| </note> |
| |
| <!-- This is the list including defaults from the pre-release 1.2 impala-shell: |
| ABORT_ON_DEFAULT_LIMIT_EXCEEDED: 0 |
| ABORT_ON_ERROR: 0 |
| ALLOW_UNSUPPORTED_FORMATS: 0 |
| BATCH_SIZE: 0 |
| DEBUG_ACTION: |
| DEFAULT_ORDER_BY_LIMIT: -1 |
| DISABLE_CODEGEN: 0 |
| HBASE_CACHE_BLOCKS: 0 |
| HBASE_CACHING: 0 |
| MAX_ERRORS: 0 |
| MAX_IO_BUFFERS: 0 |
| MAX_SCAN_RANGE_LENGTH: 0 |
| MEM_LIMIT: 0 |
| NUM_NODES: 0 |
| NUM_SCANNER_THREADS: 0 |
| PARQUET_COMPRESSION_CODEC: SNAPPY |
| PARQUET_FILE_SIZE: 0 |
| SUPPORT_START_OVER: false |
| --> |
| |
| <p outputclass="toc"/> |
| |
| <p conref="../shared/impala_common.xml#common/related_info"/> |
| |
| <p> |
| <xref href="impala_set.xml#set"/> |
| </p> |
| </conbody> |
| </concept> |