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https://issues.apache.org/jira/browse/DRILL-7199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16831192#comment-16831192
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ASF GitHub Bot commented on DRILL-7199:
---------------------------------------
dvjyothsna commented on pull request #1771: DRILL-7199: Optimize population of
metadata for non-interesting columns
URL: https://github.com/apache/drill/pull/1771#discussion_r280180725
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/metastore/NonInterestingColumnsMetadata.java
##########
@@ -0,0 +1,72 @@
+/*
+ * 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.metastore;
+
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.exec.record.metadata.ColumnMetadata;
+import org.apache.drill.exec.record.metadata.TupleMetadata;
+import java.util.Map;
+
+/**
+ * Represents a metadata for the non-interesting columns. Since the refresh
command doesn't store the non-interesting
+ * columns stats in teh cache file, there is a need to mark column statistics
of non-interesting as unknown to
+ * differentiate the non-interesting columns from non-existent columns.
+ */
+public class NonInterestingColumnsMetadata implements BaseMetadata {
Review comment:
Added a comment to clarify that NonInterestingColumnsMetadata is not
applicable to some of the methods.
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> Optimize the time taken to populate column statistics for non-interesting
> columns
> ---------------------------------------------------------------------------------
>
> Key: DRILL-7199
> URL: https://issues.apache.org/jira/browse/DRILL-7199
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Venkata Jyothsna Donapati
> Assignee: Venkata Jyothsna Donapati
> Priority: Minor
> Fix For: 1.17.0
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> Currently populating column statistics for non-interesting columns very long
> since it is populated for every row group. Since non-interesting column
> statistics are common for the table, it can be populated once and can be
> reused.
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