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b5e2f338ab
Change-Id: I5fa4fc27d6566e87fdabe57edc176133d586a84b Reviewed-on: http://gerrit.cloudera.org:8080/8771 Reviewed-by: Michael Brown <mikeb@cloudera.com> Tested-by: Impala Public Jenkins
102 lines
3.5 KiB
XML
102 lines
3.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="query_options">
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<title>Query Options for the SET Statement</title>
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<prolog>
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<metadata>
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<data name="Category" value="Impala Query Options"/>
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<data name="Category" value="Impala"/>
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<data name="Category" value="impala-shell"/>
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<data name="Category" value="SQL"/>
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<data name="Category" value="Querying"/>
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<data name="Category" value="Configuring"/>
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<data name="Category" value="Data Analysts"/>
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<data name="Category" value="Developers"/>
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</metadata>
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</prolog>
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<conbody>
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<p>
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You can specify the following options using the <codeph>SET</codeph> statement, and those settings affect all
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queries issued from that session.
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</p>
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<p>
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Some query options are useful in day-to-day operations for improving usability, performance, or flexibility.
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</p>
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<p>
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Other query options control special-purpose aspects of Impala operation and are intended primarily for
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advanced debugging or troubleshooting.
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</p>
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<p>
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Options with Boolean parameters can be set to 1 or <codeph>true</codeph> to enable, or 0 or <codeph>false</codeph>
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to turn off.
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</p>
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<note rev="2.0.0">
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<p rev="2.0.0">
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In Impala 2.0 and later, you can set query options directly through the JDBC and ODBC interfaces by using the
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<codeph>SET</codeph> statement. Formerly, <codeph>SET</codeph> was only available as a command within the
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<cmdname>impala-shell</cmdname> interpreter.
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</p>
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<p rev="2.11.0">
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In <keyword keyref="impala211_full"/> and later, you can set query options for an <cmdname>impala-shell</cmdname> session
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by specifying one or more command-line arguments of the form
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<codeph>--query_option=<varname>option</varname>=<varname>value</varname></codeph>.
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See <xref keyref="shell_options"/> for details.
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</p>
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</note>
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<!-- This is the list including defaults from the pre-release 1.2 impala-shell:
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ABORT_ON_DEFAULT_LIMIT_EXCEEDED: 0
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ABORT_ON_ERROR: 0
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ALLOW_UNSUPPORTED_FORMATS: 0
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BATCH_SIZE: 0
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DEBUG_ACTION:
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DEFAULT_ORDER_BY_LIMIT: -1
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DISABLE_CODEGEN: 0
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HBASE_CACHE_BLOCKS: 0
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HBASE_CACHING: 0
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MAX_ERRORS: 0
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MAX_IO_BUFFERS: 0
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MAX_SCAN_RANGE_LENGTH: 0
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MEM_LIMIT: 0
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NUM_NODES: 0
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NUM_SCANNER_THREADS: 0
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PARQUET_COMPRESSION_CODEC: SNAPPY
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PARQUET_FILE_SIZE: 0
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SUPPORT_START_OVER: false
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-->
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<p outputclass="toc"/>
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<p conref="../shared/impala_common.xml#common/related_info"/>
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<p>
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<xref href="impala_set.xml#set"/>
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</p>
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</conbody>
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</concept>
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