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d484d2f684
This now gives a clean RAT check with bin/check-rat-report.py, which is one way for the Impala community to check compliance with ASF rules on intellectual property. Change-Id: I2ad06435f84a65ba126759e42a18fdaf52cd7036 Reviewed-on: http://gerrit.cloudera.org:8080/5232 Reviewed-by: Jim Apple <jbapple-impala@apache.org> Tested-by: Impala Public Jenkins Reviewed-by: John Russell <jrussell@cloudera.com>
100 lines
3.2 KiB
XML
100 lines
3.2 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="upsert">
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<title>UPSERT Statement (<keyword keyref="impala28"/> or higher only)</title>
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<titlealts audience="PDF"><navtitle>UPSERT</navtitle></titlealts>
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<prolog>
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<metadata>
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<data name="Category" value="Impala"/>
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<data name="Category" value="SQL"/>
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<data name="Category" value="Kudu"/>
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<data name="Category" value="ETL"/>
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<data name="Category" value="Ingest"/>
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<data name="Category" value="DML"/>
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<data name="Category" value="Developers"/>
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<data name="Category" value="Data Analysts"/>
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</metadata>
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</prolog>
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<conbody>
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<p>
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<indexterm audience="Cloudera">UPSERT statement</indexterm>
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Acts as a combination of the <codeph>INSERT</codeph>
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and <codeph>UPDATE</codeph> statements.
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For each row processed by the <codeph>UPSERT</codeph>
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statement:
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<ul>
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<li>
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<p>
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If another row already exists with the same set of primary key
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values, the other columns are updated to match the values
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from the row being <q>UPSERTed</q>.
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</p>
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</li>
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<li>
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<p>
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If there is not any row with the same set of primary key values,
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the row is created, the same as if the <codeph>INSERT</codeph>
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statement was used.
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</p>
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</li>
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</ul>
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</p>
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<p>
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Although inserting or updating a single row or a small set of rows would be inefficient for tables using HDFS
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data files, Kudu is able to perform this operation efficiently.
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Therefore, this statement only works for Impala tables that use the
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Kudu storage engine.
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</p>
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<p conref="../shared/impala_common.xml#common/syntax_blurb"/>
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<codeblock>
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</codeblock>
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<p conref="../shared/impala_common.xml#common/dml_blurb"/>
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<p conref="../shared/impala_common.xml#common/usage_notes_blurb"/>
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<p conref="../shared/impala_common.xml#common/sync_ddl_blurb"/>
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<note conref="../shared/impala_common.xml#common/compute_stats_next"/>
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<p conref="../shared/impala_common.xml#common/example_blurb"/>
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<codeblock>
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</codeblock>
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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_kudu.xml#impala_kudu"/>,
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<xref href="impala_insert.xml#insert"/>,
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<xref href="impala_update.xml#update"/>
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</p>
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</conbody>
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</concept>
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