Support marking literal characters with double quotes in `to_char` template pattern

CrateDB version

nightly

CrateDB setup information

Docker standard.

Problem

Hi. Until yesterday, the TO_CHAR function produced a valid outcome per nightly build 105c4f3. Starting today, with build 6dc60f5, the function produces an invalid outcome.

2005-05-28THH:57:00Z indicates the timestamp formatting pattern HH somehow makes it through into the formatted string, which effectively produced such an error message on a downstream integration test case exercised by the Fivetran SDK tester within the test suite of the cratedb-fivetran-destination project:

SEVERE ⚡ debugger Failed to process file: schema_migrations_input_sync_modes.json - Partner Sdk Warning. Message:
`operation_timestamp` 2005-05-28T20:57:00Z must be on or after `max(_fivetran_start)` 2005-05-28THH:57:00Z 

Evaluation

Possibly, one of the recent changes to the TO_CHAR function 9adcd82 or 6dc60f5 was detrimental.

Steps to Reproduce

SELECT TO_CHAR(MAX('2005-05-28T20:57:00Z'), 'YYYY-MM-DDTHH:MI:SSZ');

Actual Result

+----------------------+
| to_char              |
+----------------------+
| 2005-05-28THH:57:00Z |
+----------------------+

Expected Result

+----------------------+
| to_char              |
+----------------------+
| 2005-05-28T08:57:00Z |
+----------------------+

References

• Discovery: https://github.com/crate/cratedb-fivetran-destination/issues/169
• CrateDB delta: https://github.com/crate/crate/compare/105c4f3...6dc60f5