static void addMultiByteCharLeftPadded1_2(byte[] b) {
    int i = 0;
    b[i++] = (byte) 0x20; // blank " " (1 byte)
    b[i++] = (byte) 0xF0; // Smiling Face with Open Mouth and Smiling Eyes U+1F604 (4 bytes)
    b[i++] = (byte) 0x9F;
    b[i++] = (byte) 0x98;
    b[i++] = (byte) 0x84;
    b[i++] = (byte) 0xF0; // Grimacing Face U+1F62C (4 bytes)
    b[i++] = (byte) 0x9F;
    b[i++] = (byte) 0x98;
    b[i++] = (byte) 0xAC;
  }
Test vectorized expression and filter evaluation for strings.
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/expressions/TestVectorStringExpressions.java