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https://issues.apache.org/jira/browse/HIVE-27755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stamatis Zampetakis resolved HIVE-27755.
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Fix Version/s: 4.0.0
Resolution: Fixed
Fixed in
https://github.com/apache/hive/commit/1843105f27f0b3550f70f71e2bf44830c79a6c69.
Thanks for the review [~dengzh]!
> Quote identifiers in SQL emitted by SchemaTool for MySQL
> --------------------------------------------------------
>
> Key: HIVE-27755
> URL: https://issues.apache.org/jira/browse/HIVE-27755
> Project: Hive
> Issue Type: Improvement
> Components: Standalone Metastore
> Affects Versions: 4.0.0-beta-1
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Attachments: TestMysql-upgrade-after.txt,
> TestMysql-upgrade-before.txt,
> TestSchemaToolForMetastore-validateSequences-after.txt,
> TestSchemaToolForMetastore-validateSequences-before.txt,
> TestSchemaToolForMetastore-validateTables-after.txt,
> TestSchemaToolForMetastore-validateTables-before.txt
>
>
> Various SchemaTool options/tasks (e.g., "validate") generate and run SQL
> statements on the underlying database. Depending on the database identifiers
> in the SQL statements may be quoted (see
> [https://github.com/apache/hive/blob/2dbfbeefc1a73d6a50f1c829658846fc827fc780/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/tools/schematool/HiveSchemaHelper.java#L173]).
> Currently, all identifiers are quoted when the database is Postgres and this
> tickets aims to do the same for MySQL/MariaDB.
> The main motivation behind this change is to avoid unexpected surprises and
> query failures when/if the database decides to turn some of the
> tables/columns we are using internally to reserved keywords.
> As a concrete example, the Percona fork of MySQL recently turned
> SEQUENCE_TABLE into a reserved keyword
> ([https://docs.percona.com/percona-server/8.0/flexibility/sequence_table.html])
> and this comes in conflict with our internal metastore table.
> The installation scripts do not fail since in that case SEQUENCE_TABLE is
> quoted
> ([https://github.com/apache/hive/blob/2dbfbeefc1a73d6a50f1c829658846fc827fc780/standalone-metastore/metastore-server/src/main/sql/mysql/hive-schema-4.0.0-beta-2.mysql.sql#L447])
> but validation queries emitted by the SchemaTool will fail
> ([https://github.com/apache/hive/blob/2dbfbeefc1a73d6a50f1c829658846fc827fc780/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/tools/schematool/SchemaToolTaskValidate.java#L117])
> if we don't use quoted identifiers.
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