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https://issues.apache.org/jira/browse/AVRO-2154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387641#comment-16387641
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Usman Shahid commented on AVRO-2154:
------------------------------------
The problem occurs on python client in the `DatumWriter.write_union()` method.
The method iterates over all the types in a union and performs an
`isinstance()` on the value with each type. Incidentally, due to [python design
decision regarding booleans|https://www.python.org/dev/peps/pep-0285/],
`isinstance(True, int)` returns `True` to maintain backward compatibility and
since the loop in `write_union` doesn't break, the type that returns true last
in the sequence of the union gets selected. If we reverse the sequence of the
types in the union definition, it works fine and a boolean is returned on the
server side.
> Python to Java IPC converts boolean inside a union to integer
> -------------------------------------------------------------
>
> Key: AVRO-2154
> URL: https://issues.apache.org/jira/browse/AVRO-2154
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.8.2
> Environment: macOS 10.13.3
> Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
> Python 2.7.10
> Reporter: Usman Shahid
> Priority: Major
>
> Using the following IDL:
> {code:java}
> @namespace("us.codemug")
> protocol BooleanTestProtocol {
> void booleanInUnion(union{boolean, int, string} myunion);
> }
> {code}
> and the following Java implementation:
> {code:java}
> package us.codemug;
> import java.util.Map;
> import org.apache.avro.AvroRemoteException;
> public class BooleanTestResponder implements BooleanTestProtocol {
> public Void booleanInUnion(Object myunion) throws AvroRemoteException {
> print(myunion);
> return null;
> }
> private void print(Object value) {
> System.out.println("Type: " + value.getClass().getName());
> System.out.println("Value: " + value);
> }
> }
> {code}
> When performing the IPC from python with the input:
> {code}
> args = dict()
> args['myunion'] = True
> requestor.request('booleanInUnion', args)
> {code}
> Produces this output at the server side:
> {code:java}
> Type: java.lang.Integer
> Value: 1
> {code}
> The booleans are being converted to integers
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