xiong duan created CALCITE-7044:
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Summary: Add internal operator NOT NULL to enhance rewrite
COALESCE operator
Key: CALCITE-7044
URL: https://issues.apache.org/jira/browse/CALCITE-7044
Project: Calcite
Issue Type: Bug
Reporter: xiong duan
Add internal operator NOT NULL to enhance rewrite COALESCE operator.
This issue originated from the discussion of CALCITE-6978.
A new NOT NULL internal operator was added, indicating that this expression
will never be NULL.
The expression coalesce(a,b) can be transformed into CASE WHEN a is not null
THEN NOT NULL(a) ELSE b
1) `not null` operator doesn't do anything, just tell the validator this filed
is not null.
2) When we do RelToSQL, we can ignore it directly.
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