Juntao Hu created FLINK-30981:
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Summary: explain_sql throws java method not exist
Key: FLINK-30981
URL: https://issues.apache.org/jira/browse/FLINK-30981
Project: Flink
Issue Type: Bug
Components: API / Python
Affects Versions: 1.17.0
Reporter: Juntao Hu
Fix For: 1.17.0, 1.18.0
Execute `t_env.explainSql("ANY VALID SQL")` will throw error:
{code:java}
Traceback (most recent call last):
File "ISSUE/FLINK-25622.py", line 42, in <module>
main()
File "ISSUE/FLINK-25622.py", line 34, in main
print(t_env.explain_sql(
File
"/Users/vancior/Documents/Github/flink-back/flink-python/pyflink/table/table_environment.py",
line 799, in explain_sql
return self._j_tenv.explainSql(stmt, j_extra_details)
File
"/Users/vancior/miniconda3/envs/flink-python/lib/python3.8/site-packages/py4j/java_gateway.py",
line 1322, in __call__
return_value = get_return_value(
File
"/Users/vancior/Documents/Github/flink-back/flink-python/pyflink/util/exceptions.py",
line 146, in deco
return f(*a, **kw)
File
"/Users/vancior/miniconda3/envs/flink-python/lib/python3.8/site-packages/py4j/protocol.py",
line 330, in get_return_value
raise Py4JError(
py4j.protocol.Py4JError: An error occurred while calling o11.explainSql. Trace:
org.apache.flink.api.python.shaded.py4j.Py4JException: Method explainSql([class
java.lang.String, class [Lorg.apache.flink.table.api.ExplainDetail;]) does not
exist
at
org.apache.flink.api.python.shaded.py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:321)
at
org.apache.flink.api.python.shaded.py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:329)
at org.apache.flink.api.python.shaded.py4j.Gateway.invoke(Gateway.java:274)
at
org.apache.flink.api.python.shaded.py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at
org.apache.flink.api.python.shaded.py4j.commands.CallCommand.execute(CallCommand.java:79)
at
org.apache.flink.api.python.shaded.py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.base/java.lang.Thread.run(Thread.java:829) {code}
#30668 changed TableEnvironment#explainSql to an interface default method,
while both TableEnvironmentInternal and TableEnvironmentImpl not overwriting
it, it triggers a bug in py4j, see [https://github.com/py4j/py4j/issues/506] .
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