niuge01 opened a new pull request #3661: [WIP] Support materialized view URL: https://github.com/apache/carbondata/pull/3661 ### Why is this PR needed? 1. Support create materialized view on all table, include parquest table, orc table, hive table and carbon table. 2. Materialized view DDL is common in databases, carbondata should change its materialized view related SQL syntax as other database. 3. Materialized view support mutil-tenant. ### What changes were proposed in this PR? 1. Define materialized view related commands: CREATE MATERIALIZED VIEW, DROP MATERIALIZED VIEW, REFRESH MATERIALIZED VIEW and SHOW MATERIALIZED VIEW. 2. Move materialized view schema files to each database directory. 3. Support create materialized view on all table, remove carbon table related check. ### Does this PR introduce any user interface change? - Yes. (please explain the change and update document) ### Is any new testcase added? - Yes
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