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From amansinha100 <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-4237: Implement murmur3 for HashHelper
Date Tue, 19 Apr 2016 20:22:29 GMT
Github user amansinha100 commented on a diff in the pull request:

    https://github.com/apache/drill/pull/485#discussion_r60304024
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/MurmurHash3.java
---
    @@ -0,0 +1,280 @@
    +/**
    + * 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.drill.exec.expr.fn.impl;
    +
    +import io.netty.buffer.DrillBuf;
    +import io.netty.util.internal.PlatformDependent;
    +
    +
    +/**
    + *
    + * MurmurHash3 was written by Austin Appleby, and is placed in the public
    + * domain.
    + * See http://smhasher.googlecode.com/svn/trunk/MurmurHash3.cpp
    + * MurmurHash3_x64_128
    + * MurmurHash3_x86_32
    + */
    +public final class MurmurHash3 extends DrillHash{
    +
    +   public static final long fmix64(long k) {
    +    k ^= k >>> 33;
    +    k *= 0xff51afd7ed558ccdL;
    +    k ^= k >>> 33;
    +    k *= 0xc4ceb9fe1a85ec53L;
    +    k ^= k >>> 33;
    +    return k;
    +  }
    +
    +  /*
    +  Take 64 bit of murmur3_128's output
    +   */
    +  public static long murmur3_64(long bStart, long bEnd, DrillBuf buffer, int seed) {
    +
    +    long h1 = seed & 0x00000000FFFFFFFFL;
    +    long h2 = seed & 0x00000000FFFFFFFFL;
    +
    +    final long c1 = 0x87c37b91114253d5L;
    +    final long c2 = 0x4cf5ad432745937fL;
    +    long start = buffer.memoryAddress() + bStart;
    +    long end = buffer.memoryAddress() + bEnd;
    +    long length = bEnd - bStart;
    +    long roundedEnd = start + ( length & 0xFFFFFFF0);  // round down to 16 byte block
    +    for (long i=start; i<roundedEnd; i+=16) {
    +      long k1 = getLongLittleEndian(i);
    +      long k2 = getLongLittleEndian(i+8);
    +      k1 *= c1;
    +      k1  = Long.rotateLeft(k1,31);
    +      k1 *= c2;
    +      h1 ^= k1;
    +      h1 = Long.rotateLeft(h1,27);
    +      h1 += h2;
    +      h1 = h1*5+0x52dce729;
    +      k2 *= c2;
    +      k2  = Long.rotateLeft(k2,33);
    +      k2 *= c1;
    +      h2 ^= k2;
    +      h2 = Long.rotateLeft(h2,31);
    +      h2 += h1;
    +      h2 = h2*5+0x38495ab5;
    +    }
    +
    +    long k1 = 0;
    +    long k2 = 0;
    +
    +    // tail
    +    switch ((int)length & 15) {
    +      case 15: k2  = (PlatformDependent.getByte(roundedEnd+14) & 0xffL) <<
48;
    +      case 14: k2 ^= (PlatformDependent.getByte(roundedEnd+13) & 0xffL) <<
40;
    +      case 13: k2 ^= (PlatformDependent.getByte(roundedEnd+12) & 0xffL) <<
32;
    +      case 12: k2 ^= (PlatformDependent.getByte(roundedEnd+11) & 0xffL) <<
24;
    +      case 11: k2 ^= (PlatformDependent.getByte(roundedEnd+10) & 0xffL) <<
16;
    +      case 10: k2 ^= (PlatformDependent.getByte(roundedEnd+ 9) & 0xffL) <<
8;
    +      case  9: k2 ^= (PlatformDependent.getByte(roundedEnd+ 8) & 0xffL);
    +        k2 *= c2;
    +        k2  = Long.rotateLeft(k2, 33);
    +        k2 *= c1;
    +        h2 ^= k2;
    +      case  8: k1  = (long)PlatformDependent.getByte(roundedEnd+7) << 56;
    +      case  7: k1 ^= (PlatformDependent.getByte(roundedEnd+6) & 0xffL) << 48;
    +      case  6: k1 ^= (PlatformDependent.getByte(roundedEnd+5) & 0xffL) << 40;
    +      case  5: k1 ^= (PlatformDependent.getByte(roundedEnd+4) & 0xffL) << 32;
    +      case  4: k1 ^= (PlatformDependent.getByte(roundedEnd+3) & 0xffL) << 24;
    +      case  3: k1 ^= (PlatformDependent.getByte(roundedEnd+2) & 0xffL) << 16;
    +      case  2: k1 ^= (PlatformDependent.getByte(roundedEnd+1) & 0xffL) << 8;
    +      case  1: k1 ^= (PlatformDependent.getByte(roundedEnd ) & 0xffL);
    +        k1 *= c1;
    +        k1  = Long.rotateLeft(k1,31);
    +        k1 *= c2;
    +        h1 ^= k1;
    +    }
    +
    +    h1 ^= length;
    +    h2 ^= length;
    +
    +    h1 += h2;
    +    h2 += h1;
    +
    +    h1 = fmix64(h1);
    +    h2 = fmix64(h2);
    +
    +    h1 += h2;
    +    h2 += h1;
    +    // murmur3_128 should return 128 bit (h1,h2), now we return only 64bits,
    +    return h1;
    +  }
    +
    +  public static long murmur3_64(long val, int seed) {
    +
    +    long h1 = seed & 0x00000000FFFFFFFFL;
    +    long h2 = seed & 0x00000000FFFFFFFFL;
    +
    +    final long c1 = 0x87c37b91114253d5L;
    +    final long c2 = 0x4cf5ad432745937fL;
    +
    +    int length = 8;
    +    long k1 = 0;
    +
    +    k1 = val;
    +    k1 *= c1;
    +    k1  = Long.rotateLeft(k1,31);
    +    k1 *= c2;
    +    h1 ^= k1;
    +
    +    h1 ^= length;
    +    h2 ^= length;
    +
    +    h1 += h2;
    +    h2 += h1;
    +
    +    h1 = fmix64(h1);
    +    h2 = fmix64(h2);
    +
    +    h1 += h2;
    +
    +    //h2 += h1;
    +    // murmur3_128 should return 128 bit (h1,h2), now we return only 64bits,
    +    return h1;
    +
    +  }
    +
    +  public static int murmur3_32(int bStart, int bEnd, DrillBuf buffer, int seed) {
    +
    +    final long c1 = 0xcc9e2d51L;
    +    final long c2 = 0x1b873593L;
    +    long start = buffer.memoryAddress() + bStart;
    +    long length = bEnd - bStart;
    +    long UINT_MASK=0xffffffffL;
    +    long lh1 = seed;
    +    long roundedEnd = start + (length & 0xfffffffc);  // round down to 4 byte block
    +
    +    for (long i=start; i<roundedEnd; i+=4) {
    +      // little endian load order
    +      long lk1 = (PlatformDependent.getByte(i) & 0xff) | ((PlatformDependent.getByte(i+1)
& 0xff) << 8) |
    +              ((PlatformDependent.getByte(i+2) & 0xff) << 16) | (PlatformDependent.getByte(i+3)
<< 24);
    +
    +      //k1 *= c1;
    +      lk1 *= c1;
    +      lk1 &= UINT_MASK;
    +
    +      lk1 = ((lk1 << 15) & UINT_MASK) | (lk1 >>> 17);
    +
    +      lk1 *= c2;
    +      lk1 = lk1 & UINT_MASK;
    +      lh1 ^= lk1;
    +      lh1 = ((lh1 << 13) & UINT_MASK) | (lh1 >>> 19);
    +
    +      lh1 = lh1*5+0xe6546b64L;
    +      lh1 = UINT_MASK & lh1;
    +    }
    +
    +    // tail
    +    long lk1 = 0;
    +
    +    switch((byte)length & 0x03) {
    +      case 3:
    +        lk1 = (PlatformDependent.getByte(roundedEnd + 2) & 0xff) << 16;
    +      case 2:
    +        lk1 |= (PlatformDependent.getByte(roundedEnd + 1) & 0xff) << 8;
    +      case 1:
    +        lk1 |= (PlatformDependent.getByte(roundedEnd) & 0xff);
    +        lk1 *= c1;
    +        lk1 = UINT_MASK & lk1;
    +        lk1 = ((lk1 << 15) & UINT_MASK) | (lk1 >>> 17);
    +
    +        lk1 *= c2;
    +        lk1 = lk1 & UINT_MASK;
    +
    +        lh1 ^= lk1;
    +    }
    +
    +    // finalization
    +    lh1 ^= length;
    +
    +    lh1 ^= lh1 >>> 16;
    +    lh1 *= 0x85ebca6b;
    +    lh1 = UINT_MASK & lh1;
    +    lh1 ^= lh1 >>> 13;
    +
    +    lh1 *= 0xc2b2ae35;
    +    lh1 = UINT_MASK & lh1;
    +    lh1 ^= lh1 >>> 16;
    +
    +    return (int)(lh1 & UINT_MASK);
    +  }
    +
    +  public static int murmur3_32(long val, int seed) {
    +    final long c1 = 0xcc9e2d51L;
    +    final long c2 = 0x1b873593;
    +    long length = 8;
    +    long UINT_MASK=0xffffffffL;
    +    long lh1 = seed & UINT_MASK;
    +    for (int i=0; i<2; i++) {
    +      //int ik1 = (int)((val >> i*32) & UINT_MASK);
    +      long lk1 = ((val >> i*32) & UINT_MASK);
    +
    +      //k1 *= c1;
    +      lk1 *= c1;
    +      lk1 &= UINT_MASK;
    +
    +      lk1 = ((lk1 << 15) & UINT_MASK) | (lk1 >>> 17);
    +
    +      lk1 *= c2;
    +      lk1 &= UINT_MASK;
    +
    +      lh1 ^= lk1;
    +      lh1 = ((lh1 << 13) & UINT_MASK) | (lh1 >>> 19);
    +
    +      lh1 = lh1*5+0xe6546b64L;
    +      lh1 = UINT_MASK & lh1;
    +    }
    +    // finalization
    +    lh1 ^= length;
    +
    +    lh1 ^= lh1 >>> 16;
    +    lh1 *= 0x85ebca6bL;
    +    lh1 = UINT_MASK & lh1;
    +    lh1 ^= lh1 >>> 13;
    +    lh1 *= 0xc2b2ae35L;
    +    lh1 = UINT_MASK & lh1;
    +    lh1 ^= lh1 >>> 16;
    +
    +    return (int)lh1;
    +  }
    +
    +  public static long hash64(double val, long seed){
    +    return murmur3_64(Double.doubleToLongBits(val), (int)seed);
    +  }
    +
    +  public static long hash64(long start, long end, DrillBuf buffer, long seed){
    +    return murmur3_64(start, end, buffer, (int)seed);
    +  }
    +
    +  public static int hash32(double val, long seed) {
    +    //return com.google.common.hash.Hashing.murmur3_128().hashLong(Double.doubleToLongBits(val)).asInt();
    --- End diff --
    
    Remove..


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