[jira] [Created] (FLINK-35998) Duplicate common type search in type inference

["Dylan He (Jira)" <ji...@apache.org>]

Dylan He created FLINK-35998:
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             Summary: Duplicate common type search in type inference
                 Key: FLINK-35998
                 URL: https://issues.apache.org/jira/browse/FLINK-35998
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
            Reporter: Dylan He


Currently, some built-in functions, such as {{{}*IFNULL* and *COALESCE*{}}}, use the *{{CommonArgumentStrategy}}* in their inputTypeStrategy, which will find a common type among all arguments. However, when multiple arguments take this strategy in one function, redundant search will be performed, obviously this is unnecessary and harms the efficiency of type inference.

A feasible improvement approach is to adopt {*}{{CommonInputTypeStrategy}}{*}. Unlike its predecessor, this strategy performs the search of the common type just once and subsequently replicates the result to all related arguments.



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