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

    https://github.com/apache/phoenix/pull/34#discussion_r23710801
  
    --- Diff: 
phoenix-core/src/main/java/org/apache/phoenix/index/IndexMaintainer.java ---
    @@ -326,6 +326,49 @@ private IndexMaintainer(PTable dataTable, PTable 
index) {
             // TODO: check whether index is immutable or not. Currently it's 
always false so checking
             // data table is with immutable rows or not.
             this.immutableRows = dataTable.isImmutableRows();
    +        int indexColByteSize = 0;
    +        for (int i = indexPosOffset; i < index.getPKColumns().size(); i++) 
{
    +            PColumn indexColumn = index.getPKColumns().get(i);
    +            int indexPos = i - indexPosOffset;
    +            Expression expression = null;
    +            try {
    +                ParseNode parseNode  = 
SQLParser.parseCondition(indexColumn.getExpressionStr());
    +                ColumnResolver resolver = FromCompiler.getResolver(new 
TableRef(dataTable));
    +                StatementContext context = new StatementContext(new 
PhoenixStatement(connection), resolver);
    +                expression = parseNode.accept(new 
ExpressionCompiler(context));
    --- End diff --
    
    If the null check idea above won't work, instead of the instanceof check 
below, can you track in the ExpressionCompiler if you've compiled an expression 
versus only a column that maps to the PK column in the data table? You could 
specialize the resolveColumn method of your ExpressionCompiler and check 
visitor.isTopLevel() and 
SchemaUtil.isPKColumn(IndexUtil.getDataColumn(dataTable, 
indexColumn.getName().getString()))


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