[GitHub] [pinot] chenboat commented on a diff in pull request #10867: FUNNEL_COUNT Aggregation Function

["chenboat (via GitHub)" <gi...@apache.org>]

chenboat commented on code in PR #10867:
URL: https://github.com/apache/pinot/pull/10867#discussion_r1222398109


##########
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/FunnelCountAggregationFunction.java:
##########
@@ -0,0 +1,512 @@
+/**
+ * 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.query.aggregation.function;
+
+import com.google.common.base.Preconditions;
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import javax.annotation.concurrent.ThreadSafe;
+import org.apache.pinot.common.request.context.ExpressionContext;
+import org.apache.pinot.common.utils.DataSchema.ColumnDataType;
+import org.apache.pinot.core.common.BlockValSet;
+import org.apache.pinot.core.query.aggregation.AggregationResultHolder;
+import org.apache.pinot.core.query.aggregation.ObjectAggregationResultHolder;
+import org.apache.pinot.core.query.aggregation.groupby.GroupByResultHolder;
+import org.apache.pinot.core.query.aggregation.groupby.ObjectGroupByResultHolder;
+import org.apache.pinot.segment.spi.AggregationFunctionType;
+import org.apache.pinot.segment.spi.index.reader.Dictionary;
+import org.roaringbitmap.RoaringBitmap;
+
+
+/**
+ * The {@code FunnelCountAggregationFunction} calculates the number of step conversions for a given partition column and
+ * a list of boolean expressions.
+ * <p>IMPORTANT: This function relies on the partition column being partitioned for each segment, where there are no
+ * common values within different segments.

Review Comment:
   within --> across?



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