Use empty parsing context to build view's select in CREATE VIEW statement (#2049)

[jepett0]

Based on: #2049

KIKIMR-20891

CREATE VIEW statement parses (and validates) the select statement saved in the view. It should be parsed in a context isolated from the statements executed before the CREATE VIEW statement (we haven't decided yet on the exact scope of the context of the view's select statement, see KIKIMR-20656). It is pretty obvious that one should be able to execute the following statement in one go ("one go" = one press of a "run" button in YDB UI):

-- create view NecessaryInnerView with (security_invoker = true) as select 1;
-- create view ContextTestingView with (security_invoker = true) as select * from `/local/NecessaryInnerView`; -- where `/local/...` is your cluster name

drop view ContextTestingView;
create view ContextTestingView with (security_invoker = true) as select * from `/local/NecessaryInnerView`;

However, executing both drop view and create view in one go currently produces and error:

DropObject is not yet implemented for intent determination transformer

which indicates that the context of the inner query:

select * from `/local/NecessaryInnerView`

is polluted by the previous:

drop view ContextTestingView;

statement.

This problem is fixed by using an empty parsing context for parsing view's inner select statement during handling of CREATE VIEW statement.

[github-actions]

⚪ 2024-03-12 17:50:13 UTC Pre-commit check for f4e2945 has started.
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🔴 2024-03-12 17:54:46 UTC Some tests failed, follow the links below.

Test history

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
16055	15946	0	18	58	33

[github-actions]

⚪ 2024-03-12 17:51:55 UTC Pre-commit check for f4e2945 has started.
⚪ 2024-03-12 17:51:57 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2024-03-12 17:53:39 UTC Build successful.
⚪ 2024-03-12 17:53:55 UTC Tests are running...
🟢 2024-03-12 19:07:44 UTC Tests successful.

Test history

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
60274	50876	0	0	9340	58