[jira] [Created] (FLINK-29072) Migrate DDL-related schema handling to the new Schema framework

["Jane Chan (Jira)" <ji...@apache.org>]

Jane Chan created FLINK-29072:
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             Summary: Migrate DDL-related schema handling to the new Schema framework
                 Key: FLINK-29072
                 URL: https://issues.apache.org/jira/browse/FLINK-29072
             Project: Flink
          Issue Type: Technical Debt
          Components: Table SQL / API
    Affects Versions: 1.16.0
            Reporter: Jane Chan


[FLIP-164|https://cwiki.apache.org/confluence/display/FLINK/FLIP-164%3A+Improve+Schema+Handling+in+Catalogs] introduces the new Schema framework. Yet all DDL-related functionalities (such as CREATE TABLE, CREATE TABLE LIKE, ALTER TABLE SET/RESET, ALTER TABLE ADD/DROP CONSTRAINT, SHOW CREATE TABLE, etc.) are based on the deprecated CatalogTableImpl and TableSchema.

The FLIP said, "For backward compatibility, we leave Catalog#createTable and Catalog#alterTable untouched." Therefore, issues like FLINK-18958, FLINK-28690, etc., cannot be resolved. And new functionalities like ALTER TABLE ADD/MODIFY face a dilemma of implementing against the new framework but lose backward consistency.

Fully migrating to the new framework takes a lot of effort and maybe a long-term plan, but at least it's the time to put it on the agenda to have a track.



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