Paul Rogers created IMPALA-8106:
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Summary: Cleanup of literal expression nodes
Key: IMPALA-8106
URL: https://issues.apache.org/jira/browse/IMPALA-8106
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Affects Versions: Impala 3.1.0
Reporter: Paul Rogers
Assignee: Paul Rogers
IMPALA-7902 cleaned up numeric literals to fix confusing cast logic, to avoid
the need to analyze a literal, and so on. This ticket proposes to do the same
for the other literal expressions which, as a whole, need less work than the
numeric literal did. In particular:
* Remove the need to analyze any literal expression.
* Clean up the cumbersome way that code creates and analyzes literals.
* Much code uses an awkward sequence of steps to force a constant expression to
s specific type. Streamline this code.
* The constant expression evaluator is confused about the return SQL type. Is
it the type of the original expression (as often required in statements) or the
simplest type (as required by catalog code such as partition keys.) Create two
distinct methods: one for each case.
This work, in turn, is part of the ongoing effort to merge expression rewrites
into a single-pass analysis phase in order to more cleanly introduce additional
rewrite rules.
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