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f3820e6205
For history and tracking purposes, there are many instances of rev="CDH-1234" for various CDH- JIRA numbers. This produces no visible output, it's just FYI for the person editing the source. Removing all these now from the upstream doc source, so as not to have "CDH" all through the doc source files. Change-Id: I29089e5a31cd72e876b2ccb8375d1c10693c6aba Reviewed-on: http://gerrit.cloudera.org:8080/6349 Reviewed-by: Ambreen Kazi <ambreen.kazi@cloudera.com> Reviewed-by: John Russell <jrussell@cloudera.com> Tested-by: Impala Public Jenkins
68 lines
2.6 KiB
XML
68 lines
2.6 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="parquet_fallback_schema_resolution" rev="2.6.0 IMPALA-2835">
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<title>PARQUET_FALLBACK_SCHEMA_RESOLUTION Query Option (<keyword keyref="impala26"/> or higher only)</title>
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<titlealts audience="PDF"><navtitle>PARQUET_FALLBACK_SCHEMA_RESOLUTION</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="Impala Query Options"/>
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<data name="Category" value="Parquet"/>
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<data name="Category" value="Schemas"/>
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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 rev="2.6.0 IMPALA-2835">
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<indexterm audience="hidden">PARQUET_FALLBACK_SCHEMA_RESOLUTION query option</indexterm>
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Allows Impala to look up columns within Parquet files by column name, rather than column order,
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when necessary.
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</p>
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<p conref="../shared/impala_common.xml#common/usage_notes_blurb"/>
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<p>
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By default, Impala looks up columns within a Parquet file based on
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the order of columns in the table.
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The <codeph>name</codeph> setting for this option enables behavior for Impala queries
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similar to the Hive setting <codeph>parquet.column.index.access=false</codeph>.
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It also allows Impala to query Parquet files created by Hive with the
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<codeph>parquet.column.index.access=false</codeph> setting in effect.
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</p>
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<p>
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<b>Type:</b> integer or string.
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Allowed values are 0 or <codeph>position</codeph> (default), 1 or <codeph>name</codeph>.
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</p>
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<p conref="../shared/impala_common.xml#common/added_in_260"/>
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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_parquet.xml#parquet_schema_evolution"/>
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</p>
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</conbody>
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</concept>
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