Rong Rong created FLINK-8215:
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Summary: Collections codegen exception when constructing Array or
Map via SQL API
Key: FLINK-8215
URL: https://issues.apache.org/jira/browse/FLINK-8215
Project: Flink
Issue Type: Bug
Components: Table API & SQL
Reporter: Rong Rong
Assignee: Rong Rong
TableAPI goes through `LogicalNode.validate()`, which brings up the collection
validation and rejects inconsistent type, this will throw `ValidationExcpetion`
for something like `array(1.0, 2.0f)`.
SqlAPI uses `FlinkPlannerImpl.validator(SqlNode)`, which uses calcite SqlNode
validation, which supports resolving leastRestrictive type. `ARRAY[CAST(1 AS
DOUBLE), CAST(2 AS FLOAT)]` throws codegen exception.
Root cause is the CodeGeneration for these collection value constructors does
not cast or resolve leastRestrictive type correctly. I see 2 options:
1. Strengthen validation to not allow resolving leastRestrictive type on SQL.
2. Making codegen support leastRestrictive type cast, such as using
`generateCast` instead of direct casting like `(ClassType) element`.
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