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https://issues.apache.org/jira/browse/HIVE-26767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17637337#comment-17637337
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Tim Thorpe commented on HIVE-26767:
-----------------------------------
I have added a PR to fix the issue - [https://github.com/apache/hive/pull/3799]
> Support for custom RDBMS is broken
> ----------------------------------
>
> Key: HIVE-26767
> URL: https://issues.apache.org/jira/browse/HIVE-26767
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Affects Versions: 4.0.0
> Reporter: Tim Thorpe
> Priority: Minor
>
> HIVE-24120 introduced code to support custom RDBMS.
> DatabaseProduct.getDbType(String productName) will return `DbType.UNDEFINED`
> for anything other than the hardcoded/internally supported database types.
> When initializing DatabaseProduct with an external/custom RDBMS, it follows
> this logic:
>
> ```
> boolean isExternal = MetastoreConf.getBoolVar(conf,
> ConfVars.USE_CUSTOM_RDBMS);
> if (isExternal) {
> // The DatabaseProduct will be created by instantiating an external
> class via
> // reflection. The external class can override any method in the
> current class
> String className = MetastoreConf.getVar(conf,
> ConfVars.CUSTOM_RDBMS_CLASSNAME);
> if (className != null) {
> try {
> theDatabaseProduct = (DatabaseProduct)
> ReflectionUtils.newInstance(Class.forName(className), conf);
> LOG.info(String.format("Using custom RDBMS %s", className));
> dbt = DbType.CUSTOM;
> ```
> These 2 database types (DbType.UNDEFINED, DbType.CUSTOM) are then compared to
> each other to make sure they are the same.
>
> `Preconditions.checkState(theDatabaseProduct.dbType ==
> getDbType(productName));`
>
> [https://github.com/gatorblue/hive/blob/3a65c6cf9cb552e7c34bfb449a419abfde0a58b6/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/DatabaseProduct.java#L80]
>
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