Julian Hyde created CALCITE-604:
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Summary: Invoke metadata providers via MethodHandle rather than
reflection
Key: CALCITE-604
URL: https://issues.apache.org/jira/browse/CALCITE-604
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
JDK 1.7 introduced
http://docs.oracle.com/javase/7/docs/api/java/lang/invoke/MethodHandle.html, a
more efficient way to invoke methods. Access control etc. is done when the
handle is created, not each invocation.
Currently calls to metadata providers are dispatched via reflection
(Method.invoke, see ReflectiveRelMetadataProvider, ChainedRelMetadataProvider
and CachingInvocationHandler), and I suspect that planning a complex query
(especially with tracing enabled) makes millions of calls. Moving to
MethodHandle would improve performance.
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