[jira] [Created] (PHOENIX-5544) Dropping a base table with cascade with an older client does not drop child views

["Chinmay Kulkarni (Jira)" <ji...@apache.org>]

Chinmay Kulkarni created PHOENIX-5544:
-----------------------------------------

             Summary: Dropping a base table with cascade with an older client does not drop child views
                 Key: PHOENIX-5544
                 URL: https://issues.apache.org/jira/browse/PHOENIX-5544
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 4.15.0, 5.1.0
            Reporter: Chinmay Kulkarni
            Assignee: Chinmay Kulkarni
             Fix For: 4.15.0, 5.1.0


1) Start the server with 4.15.0 Phoenix
2) Connect with a 4.14 client
3) Create a base table and a view on top of the base table:
{code:sql}
CREATE TABLE IF NOT EXISTS Z_BASE_TABLE (ID INTEGER NOT NULL PRIMARY KEY, HOST VARCHAR(10), FLAG BOOLEAN);

CREATE VIEW Z_VIEW1 (col1 INTEGER, col2 INTEGER, col3 INTEGER, col4 INTEGER, col5 INTEGER) AS SELECT * FROM Z_BASE_TABLE WHERE ID>10;
{code}

4) Drop the base table with the cascade option:
{code:sql}
DROP TABLE Z_BASE_TABLE CASCADE;
{code}

5) Metadata for Z_VIEW1 is still there in SYSTEM.CATALOG and should be removed when trying to recreate the same base table:
{code:sql}
CREATE TABLE IF NOT EXISTS Z_BASE_TABLE (ID INTEGER NOT NULL PRIMARY KEY, HOST VARCHAR(10), FLAG BOOLEAN);
{code}

6) This should remove the metadata for Z_VIEW1, but it does not. In fact, you can now query Z_VIEW1 as if it was a valid view created on top of the new Z_BASE_TABLE, however there is no parent->child link i.e.:
{code:sql}
SELECT * FROM SYSTEM.CATALOG WHERE LINK_TYPE=4;
{code}
--> Returns no results.

Effectively, Z_VIEW1 is sort of an "orphan" view with child->parent links but no parent->child links. This is dangerous if a user wants to drop and recreate a base table, but views from the previous lifetime of the base table can still be used to interact with the new base table.




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