FrankChen021 commented on code in PR #20586:
URL: https://github.com/apache/druid/pull/20586#discussion_r4270860645


##########
sql/src/main/java/org/apache/druid/sql/calcite/schema/SystemQueryContextParametersTable.java:
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@@ -0,0 +1,316 @@
+/*
+ * 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.druid.sql.calcite.schema;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.calcite.DataContext;
+import org.apache.calcite.linq4j.Enumerable;
+import org.apache.calcite.linq4j.Linq4j;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rel.type.RelDataTypeFactory;
+import org.apache.calcite.schema.ScannableTable;
+import org.apache.calcite.schema.Schema;
+import org.apache.calcite.schema.impl.AbstractTable;
+import org.apache.druid.error.DruidException;
+import org.apache.druid.java.util.common.HumanReadableBytes;
+import org.apache.druid.query.BadQueryContextException;
+import org.apache.druid.query.QueryConfigProvider;
+import org.apache.druid.query.context.QueryContextParameter;
+import org.apache.druid.query.context.QueryContextParameters;
+import org.apache.druid.query.context.constraint.ParameterConstraint;
+import org.apache.druid.query.context.constraint.Range;
+import org.apache.druid.query.context.docs.ParameterDocumentation;
+import org.apache.druid.segment.column.ColumnType;
+import org.apache.druid.segment.column.RowSignature;
+import org.apache.druid.server.security.Action;
+import org.apache.druid.server.security.AuthenticationResult;
+import org.apache.druid.server.security.AuthorizationUtils;
+import org.apache.druid.server.security.AuthorizerMapper;
+import org.apache.druid.server.security.Resource;
+import org.apache.druid.server.security.ResourceAction;
+import org.apache.druid.server.security.ResourceType;
+import org.apache.druid.sql.calcite.table.RowSignatures;
+
+import javax.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * System table {@code sys.query_context_parameters}, listing the query 
context parameters declared in
+ * {@link QueryContextParameters#ALL} that users can set, together with their 
type, default, applicability and
+ * documentation. {@link QueryContextParameter.Visibility#SYSTEM} parameters, 
which only Druid sets, are excluded.
+ */
+public class SystemQueryContextParametersTable extends AbstractTable 
implements ScannableTable
+{
+  public static final String TABLE_NAME = "query_context_parameters";
+
+  static final RowSignature ROW_SIGNATURE = RowSignature
+      .builder()
+      .add("name", ColumnType.STRING)
+      .add("type", ColumnType.STRING)
+      .add("range", ColumnType.STRING)

Review Comment:
   [P2] Use a non-reserved name for range
   
   **Finding:** The new column is named `range`, but Druid's Calcite grammar 
treats RANGE as a reserved window-frame keyword. References such as `SELECT 
range FROM sys.query_context_parameters` or `WHERE range IS NOT NULL` therefore 
fail during parsing unless the column is quoted.
   
   **Suggestion:** Rename the column to a non-reserved identifier, or add RANGE 
to Druid's non-reserved keyword set with parser coverage.



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