Github user JamesRTaylor commented on a diff in the pull request:

    https://github.com/apache/phoenix/pull/34#discussion_r23663940
  
    --- Diff: 
phoenix-core/src/main/java/org/apache/phoenix/index/IndexMaintainer.java ---
    @@ -881,7 +908,30 @@ public void readFields(DataInput input) throws 
IOException {
             }
             indexTableName = Bytes.readByteArray(input);
             dataEmptyKeyValueCF = Bytes.readByteArray(input);
    -        emptyKeyValueCFPtr = new 
ImmutableBytesPtr(Bytes.readByteArray(input));
    +        int len = WritableUtils.readVInt(input);
    +        //TODO remove this in the next major release
    +        boolean isNewClient = false;
    +        if (len < 0) {
    +          isNewClient = true;
    +          len=Math.abs(len);
    +        }
    +        byte [] emptyKeyValueCF = new byte[len];
    +        input.readFully(emptyKeyValueCF, 0, len);
    +        emptyKeyValueCFPtr = new ImmutableBytesPtr(emptyKeyValueCF);
    +        
    +        if (isNewClient) {
    +            int numIndexedExpressions = WritableUtils.readVInt(input);
    +            indexedExpressions = 
Sets.newLinkedHashSetWithExpectedSize(numIndexedExpressions);        
    +            for (int i = 0; i < numIndexedExpressions; i++) {
    +                   Expression expression = 
ExpressionType.values()[WritableUtils.readVInt(input)].newInstance();
    +                   expression.readFields(input);
    +                   indexedExpressions.add(expression);
    +            }
    +        }
    +        else {
    +            indexedExpressions = 
Sets.newLinkedHashSetWithExpectedSize(indexedColumnTypes.size());
    +            //TODO figure out how to create indexedExpressions
    --- End diff --
    
    You can go through this constructor that only requires a PDatum (which you 
can define inline):
    
        public KeyValueColumnExpression(PDatum column, byte[] cf, byte[] cq) {
            super(column);
            this.cf = cf;
            this.cq = cq;
        }
    



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