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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>
68 lines
2.7 KiB
XML
68 lines
2.7 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 CDH-33330">
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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 CDH-33330">
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<indexterm audience="Cloudera">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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