Sean Hsuan-Yi Chu created DRILL-4372:
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Summary: Let Operators and Functions expose the types
Key: DRILL-4372
URL: https://issues.apache.org/jira/browse/DRILL-4372
Project: Apache Drill
Issue Type: Improvement
Components: Query Planning & Optimization
Reporter: Sean Hsuan-Yi Chu
Assignee: Sean Hsuan-Yi Chu
Currently, for most operators / functions, Drill would always claim the return
types being nullable-any.
However, in many cases (such as Hive, View, etc.), the types of input columns
are known. So, along with resolving to the correct operators / functions, we
can infer the output types at planning.
Having this mechanism can help speed up many applications, especially where
schemas alone are sufficient (e.g., Limit-0).
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