emkornfield commented on a change in pull request #10951:
URL: https://github.com/apache/arrow/pull/10951#discussion_r699813907



##########
File path: go/parquet/metadata/column_chunk.go
##########
@@ -0,0 +1,385 @@
+// 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 metadata
+
+import (
+       "bytes"
+       "context"
+       "io"
+       "reflect"
+
+       "github.com/apache/arrow/go/arrow/memory"
+       "github.com/apache/arrow/go/parquet"
+       "github.com/apache/arrow/go/parquet/compress"
+       "github.com/apache/arrow/go/parquet/internal/encryption"
+       format "github.com/apache/arrow/go/parquet/internal/gen-go/parquet"
+       "github.com/apache/arrow/go/parquet/internal/thrift"
+       "github.com/apache/arrow/go/parquet/schema"
+       "golang.org/x/xerrors"
+)
+
+// PageEncodingStats is used for counting the number of pages of specific
+// types with the given internal encoding.
+type PageEncodingStats struct {
+       Encoding parquet.Encoding
+       PageType format.PageType
+}
+
+func makeColumnStats(metadata *format.ColumnMetaData, descr *schema.Column, 
mem memory.Allocator) TypedStatistics {
+       if descr.ColumnOrder() == parquet.ColumnOrders.TypeDefinedOrder {
+               return NewStatisticsFromEncoded(descr, mem, 
metadata.Statistics.MinValue, metadata.Statistics.MaxValue,

Review comment:
       is there anyway in go to get  abetter stent that these aren't 
misalligned?  builder pattern?




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