siddharthteotia commented on a change in pull request #4983: Make PQL case 
insensitive
URL: https://github.com/apache/incubator-pinot/pull/4983#discussion_r366670903
 
 

 ##########
 File path: 
pinot-common/src/main/java/org/apache/pinot/common/utils/helix/TableCache.java
 ##########
 @@ -0,0 +1,189 @@
+/**
+ * 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.pinot.common.utils.helix;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import org.I0Itec.zkclient.IZkChildListener;
+import org.I0Itec.zkclient.IZkDataListener;
+import org.apache.helix.AccessOption;
+import org.apache.helix.ZNRecord;
+import org.apache.helix.store.HelixPropertyListener;
+import org.apache.helix.store.zk.ZkHelixPropertyStore;
+import org.apache.pinot.common.config.TableConfig;
+import org.apache.pinot.common.config.TableNameBuilder;
+import org.apache.pinot.common.utils.SchemaUtils;
+import org.apache.pinot.spi.data.FieldSpec;
+import org.apache.pinot.spi.data.Schema;
+
+
 
 Review comment:
   Good javadoc describing purpose and usage would be helpful for future readers
   
   Just to confirm --  There is one instance of TableCache per broker (via 
BaseBrokerRequestHandler created during broker start) and one instance per 
controller (created during controller start). Right?

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