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https://issues.apache.org/jira/browse/DRILL-6974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16824362#comment-16824362
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ASF GitHub Bot commented on DRILL-6974:
---------------------------------------
vvysotskyi commented on pull request #1763: DRILL-6974: Add possibility to view
option value via SET command
URL: https://github.com/apache/drill/pull/1763#discussion_r277774762
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/ResetOptionHandler.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.planner.sql.handlers;
+
+import org.apache.drill.exec.ops.QueryContext;
+import org.apache.drill.exec.physical.PhysicalPlan;
+import org.apache.drill.exec.planner.sql.DirectPlan;
+import org.apache.drill.exec.planner.sql.parser.DrillSqlResetOption;
+import org.apache.drill.exec.server.options.OptionManager;
+import org.apache.drill.exec.server.options.OptionValue;
+import org.apache.drill.exec.server.options.OptionValue.OptionScope;
+import org.apache.drill.exec.server.options.QueryOptionManager;
+import org.apache.drill.exec.work.foreman.ForemanSetupException;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlSetOption;
+
+/**
+ * Converts a {@link SqlNode} representing: "ALTER .. RESET option | ALL"
statement to a {@link PhysicalPlan}.
+ * See {@link DrillSqlResetOption}.
+ * <p>
+ * These statements have side effects i.e. the options within the system
context or the session context are modified.
+ * The resulting {@link DirectPlan} returns to the client a string that is the
name of the option that was updated
+ * or a value of the property
+ */
+public class ResetOptionHandler extends AbstractSqlSetHandler {
+
+ /**
+ * Class constructor.
+ * @param context Context of the Query
+ */
+ public ResetOptionHandler(QueryContext context) {
+ super(context);
+ }
+
+ /**
+ * {@inheritDoc}
Review comment:
Could you please add Javadoc for this method, since the parent class does
not have it? I don't see a reason for using `{@inheritDoc}` annotation here.
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> SET option command
> ------------------
>
> Key: DRILL-6974
> URL: https://issues.apache.org/jira/browse/DRILL-6974
> Project: Apache Drill
> Issue Type: Improvement
> Components: SQL Parser
> Affects Versions: 1.15.0
> Reporter: benj
> Assignee: Dmytriy Grinchenko
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.17.0
>
>
> It's currently possible to define options with the SQL command SET
> {code:java}
> ALTER SESSION SET `drill.exec.hashagg.fallback.enabled` = true;
> {code}
> But it's not possible to simply visualize the current value of one option
> with SHOW, we have to query like
> {code:java}
> SELECT * FROM sys.options WHERE `name` =
> 'drill.exec.hashagg.fallback.enabled';
> {code}
> Why not allow a simple
> {code:java}
> SET `drill.exec.hashagg.fallback.enabled`;
> {code}
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