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https://issues.apache.org/jira/browse/PARQUET-2261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17789161#comment-17789161
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ASF GitHub Bot commented on PARQUET-2261:
-----------------------------------------
ConeyLiu commented on code in PR #1177:
URL: https://github.com/apache/parquet-mr/pull/1177#discussion_r1403505946
##########
parquet-column/src/main/java/org/apache/parquet/column/statistics/SizeStatistics.java:
##########
@@ -0,0 +1,254 @@
+/*
+ * 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.parquet.column.statistics;
+
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import org.apache.parquet.Preconditions;
+import org.apache.parquet.io.api.Binary;
+import org.apache.parquet.schema.PrimitiveType;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * A structure for capturing metadata for estimating the unencoded,
+ * uncompressed size of data written. This is useful for readers to estimate
+ * how much memory is needed to reconstruct data in their memory model and for
+ * fine-grained filter push down on nested structures (the histograms contained
+ * in this structure can help determine the number of nulls at a particular
+ * nesting level and maximum length of lists).
+ */
+public class SizeStatistics {
+
+ private PrimitiveType type;
Review Comment:
final
> [Format] Add statistics that reflect decoded size to metadata
> -------------------------------------------------------------
>
> Key: PARQUET-2261
> URL: https://issues.apache.org/jira/browse/PARQUET-2261
> Project: Parquet
> Issue Type: New Feature
> Components: parquet-format
> Reporter: Micah Kornfield
> Assignee: Micah Kornfield
> Priority: Major
> Fix For: format-2.10.0
>
>
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