diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/DataPage.java b/presto-parquet/src/main/java/io/prestosql/parquet/DataPage.java
index a7be3adf163d..1d8765388f11 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/DataPage.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/DataPage.java
@@ -18,9 +18,9 @@ public abstract class DataPage
 {
     protected final int valueCount;
 
-    public DataPage(int compressedSize, int uncompressedSize, int valueCount)
+    public DataPage(int uncompressedSize, int valueCount)
     {
-        super(compressedSize, uncompressedSize);
+        super(uncompressedSize);
         this.valueCount = valueCount;
     }
 
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV1.java b/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV1.java
index 6b5d6d07af29..6282e745774d 100755
--- a/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV1.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV1.java
@@ -37,7 +37,7 @@ public DataPageV1(
             ParquetEncoding definitionLevelEncoding,
             ParquetEncoding valuesEncoding)
     {
-        super(slice.length(), uncompressedSize, valueCount);
+        super(uncompressedSize, valueCount);
         this.slice = requireNonNull(slice, "slice is null");
         this.statistics = statistics;
         this.repetitionLevelEncoding = repetitionLevelEncoding;
@@ -80,7 +80,6 @@ public String toString()
                 .add("definitionLevelEncoding", definitionLevelEncoding)
                 .add("valuesEncoding", valuesEncoding)
                 .add("valueCount", valueCount)
-                .add("compressedSize", compressedSize)
                 .add("uncompressedSize", uncompressedSize)
                 .toString();
     }
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV2.java b/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV2.java
index 42dc6a82a887..bbc614b3a39b 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV2.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/DataPageV2.java
@@ -43,7 +43,7 @@ public DataPageV2(
             Statistics<?> statistics,
             boolean isCompressed)
     {
-        super(repetitionLevels.length() + definitionLevels.length() + slice.length(), uncompressedSize, valueCount);
+        super(uncompressedSize, valueCount);
         this.rowCount = rowCount;
         this.nullCount = nullCount;
         this.repetitionLevels = requireNonNull(repetitionLevels, "repetitionLevels slice is null");
@@ -107,7 +107,6 @@ public String toString()
                 .add("statistics", statistics)
                 .add("isCompressed", isCompressed)
                 .add("valueCount", valueCount)
-                .add("compressedSize", compressedSize)
                 .add("uncompressedSize", uncompressedSize)
                 .toString();
     }
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/DictionaryPage.java b/presto-parquet/src/main/java/io/prestosql/parquet/DictionaryPage.java
index fd6684ecaa88..9a011fd723b4 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/DictionaryPage.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/DictionaryPage.java
@@ -15,10 +15,7 @@
 
 import io.airlift.slice.Slice;
 
-import java.util.Arrays;
-
 import static com.google.common.base.MoreObjects.toStringHelper;
-import static io.airlift.slice.Slices.wrappedBuffer;
 import static java.util.Objects.requireNonNull;
 
 public class DictionaryPage
@@ -38,8 +35,8 @@ public DictionaryPage(Slice slice, int dictionarySize, ParquetEncoding encoding)
 
     public DictionaryPage(Slice slice, int uncompressedSize, int dictionarySize, ParquetEncoding encoding)
     {
-        super(requireNonNull(slice, "slice is null").length(), uncompressedSize);
-        this.slice = slice;
+        super(uncompressedSize);
+        this.slice = requireNonNull(slice, "slice is null");
         this.dictionarySize = dictionarySize;
         this.encoding = requireNonNull(encoding, "encoding is null");
     }
@@ -59,11 +56,6 @@ public ParquetEncoding getEncoding()
         return encoding;
     }
 
-    public DictionaryPage copy()
-    {
-        return new DictionaryPage(wrappedBuffer(Arrays.copyOf(slice.getBytes(), slice.length())), getUncompressedSize(), dictionarySize, encoding);
-    }
-
     @Override
     public String toString()
     {
@@ -71,7 +63,6 @@ public String toString()
                 .add("slice", slice)
                 .add("dictionarySize", dictionarySize)
                 .add("encoding", encoding)
-                .add("compressedSize", compressedSize)
                 .add("uncompressedSize", uncompressedSize)
                 .toString();
     }
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/Page.java b/presto-parquet/src/main/java/io/prestosql/parquet/Page.java
index b383ac268131..f5dff2a4a1d9 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/Page.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/Page.java
@@ -15,20 +15,13 @@
 
 public abstract class Page
 {
-    protected final int compressedSize;
     protected final int uncompressedSize;
 
-    public Page(int compressedSize, int uncompressedSize)
+    public Page(int uncompressedSize)
     {
-        this.compressedSize = compressedSize;
         this.uncompressedSize = uncompressedSize;
     }
 
-    public int getCompressedSize()
-    {
-        return compressedSize;
-    }
-
     public int getUncompressedSize()
     {
         return uncompressedSize;
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/ParquetCompressionUtils.java b/presto-parquet/src/main/java/io/prestosql/parquet/ParquetCompressionUtils.java
index 7ccf6bcf9b2b..bcbfe698434f 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/ParquetCompressionUtils.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/ParquetCompressionUtils.java
@@ -31,6 +31,7 @@
 import static io.airlift.slice.SizeOf.SIZE_OF_LONG;
 import static io.airlift.slice.Slices.EMPTY_SLICE;
 import static io.airlift.slice.Slices.wrappedBuffer;
+import static java.lang.Math.toIntExact;
 import static java.util.Objects.requireNonNull;
 import static sun.misc.Unsafe.ARRAY_BYTE_BASE_OFFSET;
 
@@ -137,8 +138,7 @@ private static Slice decompressFramed(Decompressor decompressor, Slice input, in
     private static int decompress(Decompressor decompressor, Slice input, int inputOffset, int inputLength, byte[] output, int outputOffset)
     {
         byte[] byteArray = (byte[]) input.getBase();
-        int byteArrayOffset = inputOffset + (int) (input.getAddress() - ARRAY_BYTE_BASE_OFFSET);
-        int size = decompressor.decompress(byteArray, byteArrayOffset, inputLength, output, outputOffset, output.length - outputOffset);
-        return size;
+        int byteArrayOffset = inputOffset + toIntExact(input.getAddress() - ARRAY_BYTE_BASE_OFFSET);
+        return decompressor.decompress(byteArray, byteArrayOffset, inputLength, output, outputOffset, output.length - outputOffset);
     }
 }
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/ParquetTypeUtils.java b/presto-parquet/src/main/java/io/prestosql/parquet/ParquetTypeUtils.java
index 7a2b077576d9..89b536c178aa 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/ParquetTypeUtils.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/ParquetTypeUtils.java
@@ -238,7 +238,7 @@ public static long getShortDecimalValue(byte[] bytes)
         }
 
         for (int i = 0; i < bytes.length; i++) {
-            value |= ((long) bytes[bytes.length - i - 1] & 0xFFL) << (8 * i);
+            value |= (bytes[bytes.length - i - 1] & 0xFFL) << (8 * i);
         }
 
         return value;
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/RichColumnDescriptor.java b/presto-parquet/src/main/java/io/prestosql/parquet/RichColumnDescriptor.java
index 004f3aca8a33..1f87974c9027 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/RichColumnDescriptor.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/RichColumnDescriptor.java
@@ -22,23 +22,16 @@
 public class RichColumnDescriptor
         extends ColumnDescriptor
 {
-    private final PrimitiveType primitiveType;
     private final boolean required;
 
     public RichColumnDescriptor(
             ColumnDescriptor descriptor,
             PrimitiveType primitiveType)
     {
-        super(descriptor.getPath(), primitiveType.getPrimitiveTypeName(), primitiveType.getTypeLength(), descriptor.getMaxRepetitionLevel(), descriptor.getMaxDefinitionLevel());
-        this.primitiveType = primitiveType;
+        super(descriptor.getPath(), primitiveType, descriptor.getMaxRepetitionLevel(), descriptor.getMaxDefinitionLevel());
         this.required = primitiveType.getRepetition() != OPTIONAL;
     }
 
-    public PrimitiveType getPrimitiveType()
-    {
-        return primitiveType;
-    }
-
     public boolean isRequired()
     {
         return required;
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/BinaryDictionary.java b/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/BinaryDictionary.java
index db2fd8549f4b..2430486a3eab 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/BinaryDictionary.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/BinaryDictionary.java
@@ -44,14 +44,14 @@ public BinaryDictionary(DictionaryPage dictionaryPage, Integer length)
             for (int i = 0; i < content.length; i++) {
                 int len = readIntLittleEndian(dictionaryBytes, offset);
                 offset += 4;
-                content[i] = Binary.fromByteArray(dictionaryBytes, offset, len);
+                content[i] = Binary.fromReusedByteArray(dictionaryBytes, offset, len);
                 offset += len;
             }
         }
         else {
             checkArgument(length > 0, "Invalid byte array length: %s", length);
             for (int i = 0; i < content.length; i++) {
-                content[i] = Binary.fromByteArray(dictionaryBytes, offset, length);
+                content[i] = Binary.fromReusedByteArray(dictionaryBytes, offset, length);
                 offset += length;
             }
         }
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/Dictionary.java b/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/Dictionary.java
index 65ba8fb29bae..c7044f93aa6e 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/Dictionary.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/dictionary/Dictionary.java
@@ -20,19 +20,12 @@
 
 public abstract class Dictionary
 {
-    private final ParquetEncoding encoding;
-
     public Dictionary(ParquetEncoding encoding)
     {
         checkArgument(
                 encoding == ParquetEncoding.PLAIN_DICTIONARY || encoding == ParquetEncoding.PLAIN,
-                " dictionary does not support encoding: %s", encoding);
-        this.encoding = encoding;
-    }
-
-    public ParquetEncoding getEncoding()
-    {
-        return encoding;
+                "Dictionary does not support encoding: %s",
+                encoding);
     }
 
     public Binary decodeToBinary(int id)
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/predicate/Predicate.java b/presto-parquet/src/main/java/io/prestosql/parquet/predicate/Predicate.java
index 682e54bc5490..ecf1ed254d60 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/predicate/Predicate.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/predicate/Predicate.java
@@ -22,21 +22,6 @@
 
 public interface Predicate
 {
-    Predicate TRUE = new Predicate()
-    {
-        @Override
-        public boolean matches(long numberOfRows, Map<ColumnDescriptor, Statistics<?>> statistics, ParquetDataSourceId id, boolean failOnCorruptedParquetStatistics)
-        {
-            return true;
-        }
-
-        @Override
-        public boolean matches(Map<ColumnDescriptor, DictionaryDescriptor> dictionaries)
-        {
-            return true;
-        }
-    };
-
     /**
      * Should the Parquet Reader process a file section with the specified statistics.
      *
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/predicate/TupleDomainParquetPredicate.java b/presto-parquet/src/main/java/io/prestosql/parquet/predicate/TupleDomainParquetPredicate.java
index 0537cf64fd5e..76585fbb513b 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/predicate/TupleDomainParquetPredicate.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/predicate/TupleDomainParquetPredicate.java
@@ -92,12 +92,12 @@ public boolean matches(long numberOfRows, Map<ColumnDescriptor, Statistics<?>> s
             Statistics<?> columnStatistics = statistics.get(column);
             if (columnStatistics == null || columnStatistics.isEmpty()) {
                 // no stats for column
+                continue;
             }
-            else {
-                Domain domain = getDomain(effectivePredicateDomain.getType(), numberOfRows, columnStatistics, id, column.toString(), failOnCorruptedParquetStatistics);
-                if (effectivePredicateDomain.intersect(domain).isNone()) {
-                    return false;
-                }
+
+            Domain domain = getDomain(effectivePredicateDomain.getType(), numberOfRows, columnStatistics, id, column.toString(), failOnCorruptedParquetStatistics);
+            if (effectivePredicateDomain.intersect(domain).isNone()) {
+                return false;
             }
         }
         return true;
@@ -212,8 +212,8 @@ public static Domain getDomain(Type type, long rowCount, Statistics<?> statistic
 
         if (isVarcharType(type) && statistics instanceof BinaryStatistics) {
             BinaryStatistics binaryStatistics = (BinaryStatistics) statistics;
-            Slice minSlice = Slices.wrappedBuffer(binaryStatistics.getMin().getBytes());
-            Slice maxSlice = Slices.wrappedBuffer(binaryStatistics.getMax().getBytes());
+            Slice minSlice = Slices.wrappedBuffer(binaryStatistics.genericGetMin().getBytes());
+            Slice maxSlice = Slices.wrappedBuffer(binaryStatistics.genericGetMax().getBytes());
             if (minSlice.compareTo(maxSlice) > 0) {
                 failWithCorruptionException(failOnCorruptedParquetStatistics, column, id, binaryStatistics);
                 return Domain.create(ValueSet.all(type), hasNullValue);
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/reader/ColumnChunkDescriptor.java b/presto-parquet/src/main/java/io/prestosql/parquet/reader/ColumnChunkDescriptor.java
index deefda69efec..8cae486af842 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/reader/ColumnChunkDescriptor.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/reader/ColumnChunkDescriptor.java
@@ -20,21 +20,11 @@ public class ColumnChunkDescriptor
 {
     private final ColumnDescriptor columnDescriptor;
     private final ColumnChunkMetaData columnChunkMetaData;
-    private final int size;
 
-    public ColumnChunkDescriptor(
-            ColumnDescriptor columnDescriptor,
-            ColumnChunkMetaData columnChunkMetaData,
-            int size)
+    public ColumnChunkDescriptor(ColumnDescriptor columnDescriptor, ColumnChunkMetaData columnChunkMetaData)
     {
         this.columnDescriptor = columnDescriptor;
         this.columnChunkMetaData = columnChunkMetaData;
-        this.size = size;
-    }
-
-    public int getSize()
-    {
-        return size;
     }
 
     public ColumnDescriptor getColumnDescriptor()
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetColumnChunk.java b/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetColumnChunk.java
index b288e60a4b7f..22a5488f4e6b 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetColumnChunk.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetColumnChunk.java
@@ -49,11 +49,6 @@ public ParquetColumnChunk(
         this.pos = offset;
     }
 
-    public ColumnChunkDescriptor getDescriptor()
-    {
-        return descriptor;
-    }
-
     protected PageHeader readPageHeader()
             throws IOException
     {
@@ -91,11 +86,6 @@ public PageReader readAllPages()
         return new PageReader(descriptor.getColumnChunkMetaData().getCodec(), pages, dictionaryPage);
     }
 
-    public int getPosition()
-    {
-        return pos;
-    }
-
     private Slice getSlice(int size)
     {
         Slice slice = wrappedBuffer(buf, pos, size);
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetReader.java b/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetReader.java
index b07b1ec0d8a3..8ccf2f62dee9 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetReader.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/reader/ParquetReader.java
@@ -70,13 +70,12 @@ public class ParquetReader
 
     private int currentBlock;
     private BlockMetaData currentBlockMetadata;
-    private long currentPosition;
     private long currentGroupRowCount;
     private long nextRowInGroup;
     private int batchSize;
     private int nextBatchSize = INITIAL_BATCH_SIZE;
     private final PrimitiveColumnReader[] columnReaders;
-    private long[] maxBytesPerCell;
+    private final long[] maxBytesPerCell;
     private long maxCombinedBytesPerRow;
     private final long maxReadBlockBytes;
     private int maxBatchSize = MAX_VECTOR_LENGTH;
@@ -107,11 +106,6 @@ public void close()
         dataSource.close();
     }
 
-    public long getPosition()
-    {
-        return currentPosition;
-    }
-
     public int nextBatch()
     {
         if (nextRowInGroup >= currentGroupRowCount && !advanceToNextRowGroup()) {
@@ -123,7 +117,6 @@ public int nextBatch()
         batchSize = toIntExact(min(batchSize, currentGroupRowCount - nextRowInGroup));
 
         nextRowInGroup += batchSize;
-        currentPosition += batchSize;
         Arrays.stream(columnReaders)
                 .forEach(reader -> reader.prepareNextRead(batchSize));
         return batchSize;
@@ -216,7 +209,8 @@ private ColumnChunk readPrimitive(PrimitiveField field)
             int totalSize = toIntExact(metadata.getTotalSize());
             byte[] buffer = allocateBlock(totalSize);
             dataSource.readFully(startingPosition, buffer);
-            ColumnChunkDescriptor descriptor = new ColumnChunkDescriptor(columnDescriptor, metadata, totalSize);
+            ColumnChunkDescriptor descriptor = new ColumnChunkDescriptor(columnDescriptor, metadata);
+            @SuppressWarnings("resource")
             ParquetColumnChunk columnChunk = new ParquetColumnChunk(descriptor, buffer, 0);
             columnReader.setPageReader(columnChunk.readAllPages());
         }
diff --git a/presto-parquet/src/main/java/io/prestosql/parquet/reader/PrimitiveColumnReader.java b/presto-parquet/src/main/java/io/prestosql/parquet/reader/PrimitiveColumnReader.java
index 95d9c80f1bfc..36621d89b3af 100644
--- a/presto-parquet/src/main/java/io/prestosql/parquet/reader/PrimitiveColumnReader.java
+++ b/presto-parquet/src/main/java/io/prestosql/parquet/reader/PrimitiveColumnReader.java
@@ -31,7 +31,6 @@
 import it.unimi.dsi.fastutil.ints.IntList;
 import org.apache.parquet.bytes.ByteBufferInputStream;
 import org.apache.parquet.bytes.BytesUtils;
-import org.apache.parquet.column.ColumnDescriptor;
 import org.apache.parquet.column.values.ValuesReader;
 import org.apache.parquet.column.values.rle.RunLengthBitPackingHybridDecoder;
 import org.apache.parquet.io.ParquetDecodingException;
@@ -156,11 +155,6 @@ public void prepareNextRead(int batchSize)
         nextBatchSize = batchSize;
     }
 
-    public ColumnDescriptor getDescriptor()
-    {
-        return columnDescriptor;
-    }
-
     public ColumnChunk readPrimitive(Field field)
     {
         IntList definitionLevels = new IntArrayList();