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https://issues.apache.org/jira/browse/DRILL-7115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16807524#comment-16807524
]
ASF GitHub Bot commented on DRILL-7115:
---------------------------------------
vdiravka commented on pull request #1706: DRILL-7115: Improve Hive schema show
tables performance
URL: https://github.com/apache/drill/pull/1706#discussion_r271177349
##########
File path:
contrib/storage-hive/core/src/main/java/org/apache/drill/exec/store/hive/client/TableName.java
##########
@@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.store.hive.client;
+
+import java.util.Objects;
+
+/**
+ * Combination of dbName and tableName fields used
+ * to represent key for getting table data from cache.
+ */
+final class TableName {
+
+ private final String dbName;
+
Review comment:
```suggestion
```
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> Improve Hive schema show tables performance
> -------------------------------------------
>
> Key: DRILL-7115
> URL: https://issues.apache.org/jira/browse/DRILL-7115
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Hive, Storage - Information Schema
> Affects Versions: 1.15.0
> Reporter: Igor Guzenko
> Assignee: Igor Guzenko
> Priority: Major
> Fix For: 1.16.0
>
>
> In Sqlline(Drill), "show tables" on a Hive schema is taking nearly 15mins to
> 20mins. The schema has nearly ~8000 tables.
> Whereas the same in beeline(Hive) is throwing the result in a split second(~
> 0.2 secs).
> I tested the same in my test cluster by creating 6000 tables(empty!) in Hive
> and then doing "show tables" in Drill. It took more than 2 mins(~140 secs).
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