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

    https://github.com/apache/phoenix/pull/34#discussion_r23721101
  
    --- Diff: 
phoenix-core/src/main/java/org/apache/phoenix/index/IndexMaintainer.java ---
    @@ -976,20 +1043,33 @@ private void initCachedState() {
                     ref.getFamily(), ref.getQualifier())));
             }
     
    -        this.allColumns = 
Sets.newLinkedHashSetWithExpectedSize(indexedColumns.size() + 
coveredColumns.size());
    +        this.allColumns = 
Sets.newLinkedHashSetWithExpectedSize(indexedExpressions.size() + 
coveredColumns.size());
    +        // columns that are required to evaluate all expressions in 
indexedExpressions (not including columns in data row key)
    +        this.indexedColumns = 
Sets.newLinkedHashSetWithExpectedSize(indexedExpressions.size());
    +        for (Expression expression : indexedExpressions) {
    +           KeyValueExpressionVisitor visitor = new 
KeyValueExpressionVisitor() {
    +                @Override
    +                public Void visit(KeyValueColumnExpression expression) {
    +                   indexedColumns.add(new 
ColumnReference(expression.getColumnFamily(), expression.getColumnName()));
    +                    indexedColumnTypes.add(expression.getDataType());
    --- End diff --
    
    Good point. This is fine.


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