godfrey he created FLINK-12487:
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Summary: Introduce planner rules to rewrite expression and merge
calc
Key: FLINK-12487
URL: https://issues.apache.org/jira/browse/FLINK-12487
Project: Flink
Issue Type: New Feature
Components: Table SQL / Planner
Reporter: godfrey he
Assignee: godfrey he
This issue aims to introduce planner rules to rewrite expression and merge
calc, rules include:
1. {{ConvertToNotInOrInRule}}, that converts a cascade of predicates to [[IN]]
or [[NOT_IN]],
e.g.
convert predicate: {{(x = 1 OR x = 2 OR x = 3 OR x = 4) AND y = 5}} to
predicate: {{x IN (1, 2, 3, 4) AND y = 5}}
convert predicate: {{(x <> 1 AND x <> 2 AND x <> 3 AND x <> 4) AND y = 5}} to
predicate: {{x NOT IN (1, 2, 3, 4) AND y = 5}}
2. {{RewriteCoalesceRule}}, that rewrite {{Coalesce}} to {{Case When}}
3. {{FlinkCalcMergeRule}}, that is copied from Calcite {{CalcMergeRule}}, and
simplifies the merged program
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