[GitHub] dbwong commented on a change in pull request #442: PHOENIX-5122: PHOENIX-4322 breaks client backward compatibility

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dbwong commented on a change in pull request #442: PHOENIX-5122: PHOENIX-4322 breaks client backward compatibility
URL: https://github.com/apache/phoenix/pull/442#discussion_r258683896
 
 

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 File path: phoenix-core/src/main/java/org/apache/phoenix/expression/RowValueConstructorExpression.java
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 @@ -46,14 +47,30 @@
     private ImmutableBytesWritable literalExprPtr;
     private int partialEvalIndex = -1;
     private int estimatedByteSize;
+    
+    // The boolean field that indicated the object is a literal constant, 
+    // has been repurposed to a bitset and now holds additional information. 
+    // This is to facilitate b/w compat to 4.13 clients.
+    // @see <a href="https://issues.apache.org/jira/browse/PHOENIX-5122">PHOENIX-5122</a> 
+    private BitSet extraFields;
+    
+    private enum ExtraFieldPosition {
 
 Review comment:
   I dislike the ordinal Enum approach as it makes this enum order dependant and for example adding a field to the beginning here could cause backwards compatibility problems as well.  I'd prefer a enum constant with values.

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