Paul Rogers created IMPALA-8182:
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Summary: Extend PlanCtx to provide access to the entire internal
plan
Key: IMPALA-8182
URL: https://issues.apache.org/jira/browse/IMPALA-8182
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Affects Versions: Impala 3.1.0
Reporter: Paul Rogers
Assignee: Paul Rogers
Historically, the Impala planner is a function: AST in one end, Thrift plan out
the other. The planner itself creates a rich intermediate plan representation,
but none of those objects were available for testing, forcing all tests, no
matter how detailed, to run as end-to-end tests: SQL in one end, verify a (very
abbreviated) DESCRIBE output out the other.
A recent change introduced the {{PlanCtx}} that provided access to the
parallelized plan fragments. Doing so allowed adding a variety of cardinality
tests.
It turns out that additional testing requires access to the "single node plan"
in order to verify things like join cardinality.
This ticket asks to modify the {{PlanCtx}} to capture all the internal plan
nodes: both single node and distributed, to enable full unit testing.
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