Avoid checks when readBloomFilter

Author: zhangjiashen

parquet-hadoop/src/main/java/org/apache/parquet/hadoop/ParquetFileReader.java

@@ -1356,7 +1356,7 @@ public BloomFilter readBloomFilter(ColumnChunkMetaData meta) throws IOException
 
     // If it is set, read Bloom filter header and bitset together.
     // Otherwise, read Bloom filter header first and then bitset.
-    InputStream in = null;
+    InputStream in = f;
     if (bloomFilterLength > 0) {
       byte[] headerAndBitSet = new byte[bloomFilterLength];
       f.readFully(headerAndBitSet);
@@ -1365,7 +1365,7 @@ public BloomFilter readBloomFilter(ColumnChunkMetaData meta) throws IOException
 
     BloomFilterHeader bloomFilterHeader;
     try {
-      bloomFilterHeader = Util.readBloomFilterHeader(in != null ? in : f, bloomFilterDecryptor, bloomFilterHeaderAAD);
+      bloomFilterHeader = Util.readBloomFilterHeader(in, bloomFilterDecryptor, bloomFilterHeaderAAD);
     } catch (IOException e) {
       LOG.warn("read no bloom filter");
       return null;
@@ -1393,7 +1393,7 @@ public BloomFilter readBloomFilter(ColumnChunkMetaData meta) throws IOException
         f.readFully(bitset);
       }
     } else {
-      bitset = bloomFilterDecryptor.decrypt(in != null ? in : f, bloomFilterBitsetAAD);
+      bitset = bloomFilterDecryptor.decrypt(in, bloomFilterBitsetAAD);
       if (bitset.length != numBytes) {
         throw new ParquetCryptoRuntimeException("Wrong length of decrypted bloom filter bitset");
       }

parquet-hadoop/src/main/java/org/apache/parquet/hadoop/metadata/ColumnChunkMetaData.java

@@ -352,7 +352,7 @@ public long getBloomFilterOffset() {
   }
 
   /**
-   * @return the length to the Bloom filter or {@code -1} if there is no bloom filter for this column chunk
+   * @return the length to the Bloom filter or {@code -1} if there is no bloom filter length for this column chunk
    */
   @Private
   public int getBloomFilterLength() {