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cdaea7f274
Currently, we have a borrow problem because parse_schema_rows() already
borrows `schema`, but then `apply_view_deltas` does the same:
```
thread 'main' panicked at core/vdbe/mod.rs:450:49:
already mutably borrowed: BorrowError
stack backtrace:
0: __rustc::rust_begin_unwind
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/panicking.rs:697:5
1: core::panicking::panic_fmt
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:75:14
2: core::cell::panic_already_mutably_borrowed
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/cell.rs:799:5
3: core::cell::RefCell<T>::borrow
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/cell.rs:987:25
4: turso_core::vdbe::Program::apply_view_deltas
at ./core/vdbe/mod.rs:450:26
5: turso_core::vdbe::Program::commit_txn
at ./core/vdbe/mod.rs:468:9
6: turso_core::vdbe::execute::op_halt
at ./core/vdbe/execute.rs:1954:15
7: turso_core::vdbe::Program::step
at ./core/vdbe/mod.rs:430:19
8: turso_core::Statement::step
at ./core/lib.rs:1914:23
9: turso_core::util::parse_schema_rows
at ./core/util.rs:91:15
10: turso_core::Connection::parse_schema_rows::{{closure}}
at ./core/lib.rs:1518:17
11: turso_core::Connection::with_schema_mut
at ./core/lib.rs:1625:9
12: turso_core::Connection::parse_schema_rows
at ./core/lib.rs:1515:9
```
However, this is a read transaction and views are not even enabled,
let's just make `apply_view_deltas()` return early if there's no
processing needed, to skip the schema borrow altogether.