[GitHub] [incubator-pinot] kishoreg commented on a change in pull request #4798: Decouple Key from Record

[GitBox <gi...@apache.org>]

kishoreg commented on a change in pull request #4798: Decouple Key from Record
URL: https://github.com/apache/incubator-pinot/pull/4798#discussion_r343789269
 
 

 ##########
 File path: pinot-core/src/main/java/org/apache/pinot/core/data/table/BaseTable.java
 ##########
 @@ -0,0 +1,94 @@
+/**
+ * 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.core.data.table;
+
+import java.util.Iterator;
+import java.util.List;
+import org.apache.commons.collections.CollectionUtils;
+import org.apache.pinot.common.request.AggregationInfo;
+import org.apache.pinot.common.request.SelectionSort;
+import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.core.query.aggregation.function.AggregationFunction;
+import org.apache.pinot.core.query.aggregation.function.AggregationFunctionUtils;
+
+
+/**
+ * Base abstract implementation of Table
+ */
+public abstract class BaseTable implements Table {
+
+  final AggregationFunction[] _aggregationFunctions;
+  final int _numAggregations;
+  final DataSchema _dataSchema;
+  final int _numColumns;
+
+  // the capacity we need to trim to
+  final int _capacity;
+  // the capacity with added buffer, in order to collect more records than capacity for better precision
+  final int _maxCapacity;
+
+  final boolean _isOrderBy;
+  final TableResizer _tableResizer;
+
+  /**
+   * Initializes the variables and comparators needed for the table
+   */
+  BaseTable(DataSchema dataSchema, List<AggregationInfo> aggregationInfos, List<SelectionSort> orderBy, int capacity) {
+    _dataSchema = dataSchema;
+    _numColumns = dataSchema.size();
+
+    _numAggregations = aggregationInfos.size();
+    _aggregationFunctions = new AggregationFunction[_numAggregations];
+    for (int i = 0; i < _numAggregations; i++) {
+      _aggregationFunctions[i] =
+          AggregationFunctionUtils.getAggregationFunctionContext(aggregationInfos.get(i)).getAggregationFunction();
+    }
+
+    _isOrderBy = CollectionUtils.isNotEmpty(orderBy);
+    if (_isOrderBy) {
+      _tableResizer = new TableResizer(dataSchema, aggregationInfos, orderBy);
+
+      // TODO: tune these numbers
+      // Based on the capacity and maxCapacity, the resizer will smartly choose to evict/retain recors from the PQ
+      if (capacity <= 100_000) { // Capacity is small, make a very large buffer. Make PQ of records to retain, during resize
+        _maxCapacity = 1_000_000;
+      } else { // Capacity is large, make buffer only slightly bigger. Make PQ of records to evict, during resize
+        _maxCapacity = (int) (capacity * 1.2);
 
 Review comment:
   this is kind of unfair :-)  If capacity is 99k, max capacity is 1m but if capacity is 100k max capacity is 102k.

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