Jason Clawson created THRIFT-1827:
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Summary: Inconsistent behavior in isSet mechanism
Key: THRIFT-1827
URL: https://issues.apache.org/jira/browse/THRIFT-1827
Project: Thrift
Issue Type: Bug
Components: Java - Compiler
Affects Versions: 0.9
Reporter: Jason Clawson
This issue was mentioned previous in THRIFT-1394. The reporter suggested a fix
at that time which would have resolved it. Instead, the fix that was actually
applied did not fix the real issue.
The issue is that code relies on 2 different mechanisms to determine "isSet"
state. On the one hand, bit fields are kept for primitivies, on the other
"isSet" is determined if the value is null or not. The latter part is
incorrect considering one may with so set a value to null.
Consider the use case there a Thrift payload is used to send delta's of changed
information. A client can determine which fields were "set" by using the
"isSet" mechanism. This will not work for String / Struct types due to the
inconsistent behavior. Client code will be unable to determine if a String
type was: a) just not provided b) or was explicitly set to null.
My proposal to fix is the same as the original proposal in THRIFT-1394:
We already use a BitSet to track primitive types in Java. The compiler should
extend the bit vector to also guard nullable types, to be consistent with C++.
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