David Chaava created FLINK-39908:
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Summary: Add planner validation for unsupported conversions
Key: FLINK-39908
URL: https://issues.apache.org/jira/browse/FLINK-39908
Project: Flink
Issue Type: Sub-task
Reporter: David Chaava
Problem
Implicit STRING/BYTES conversions would make input formats ambiguous.
Goal
Keep GEOGRAPHY construction explicit and validation errors clear.
Solution / Scope
Reject unsupported implicit casts between GEOGRAPHY and STRING, BYTES, or
VARBINARY.
Acceptance Criteria
Unsupported casts fail with clear validation messages and planner tests cover
the failures.
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