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https://issues.apache.org/jira/browse/DRILL-7313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877727#comment-16877727
]
ASF GitHub Bot commented on DRILL-7313:
---------------------------------------
arina-ielchiieva commented on pull request #1819: DRILL-7313: Use Hive schema
for MaprDB native reader when field was empty
URL: https://github.com/apache/drill/pull/1819#discussion_r299884216
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/metastore/FileSystemMetadataProviderManager.java
##########
@@ -38,6 +41,34 @@ public static MetadataProviderManager init() {
return new FileSystemMetadataProviderManager();
}
+ /**
+ * Returns {@link TableMetadataProvider} which provides specified schema.
+ *
+ * @param schema table schema which should be provided
+ * @return {@link TableMetadataProvider} which provides specified schema
+ * @throws IOException if exception during {@link TableMetadataProvider}
construction happened
Review comment:
```suggestion
* @throws IOException if exception has happened during {@link
TableMetadataProvider} construction
```
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> Use Hive schema for MaprDB native reader when field was empty
> -------------------------------------------------------------
>
> Key: DRILL-7313
> URL: https://issues.apache.org/jira/browse/DRILL-7313
> Project: Apache Drill
> Issue Type: Task
> Affects Versions: 1.16.0
> Reporter: Volodymyr Vysotskyi
> Assignee: Volodymyr Vysotskyi
> Priority: Major
> Fix For: 1.17.0
>
>
> Currently, when an external Hive MaprDB table is queried using hive plugin
> with enabled {{store.hive.maprdb_json.optimize_scan_with_native_reader}},
> some queries may fail due to soft schema change, though Hive knows actual
> data types.
> For example, when we have a table with several fields, and one of them has
> only several non-null values, queries with grouping by such field will fail
> due to schema change.
> The goal of this Jira is to allow using types from Hive when a non-existing
> field is created, so it will allow avoiding such issues.
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