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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