tracking: postgres-compatible number `to_char` function

[forsaken628]

Summary
#16480
https://www.postgresql.org/docs/current/functions-formatting.html

• Data type: int8, int16, int32, int64 feat(query): Initial implementation of postgres-compatible number to_char function #16507
• Data type: float, double feat(query): Initial implementation of postgres-compatible number to_char function #16507
• Data type: decimal32, decimal64
• Reuse parsed FmtCacheEntry
• Pattern: 9/0/./,/PR/MI/PL/SG/EEEE/literal feat(query): Initial implementation of postgres-compatible number to_char function #16507
• Pattern S/L/D/G without locale feat(query): Simplified version Pattern S/L/D/G for number to_char #16569
• Locale Support
• Pattern: RN Roman numeral (input between 1 and 3999)
• Pattern: TH or th ordinal number suffix
• Pattern: V shift specified number of digits
• more test
• doc

[AtlasPilotPuppy]

I would like to take this isue.

[forsaken628]

Which part do you intend to implement? @AtlasPilotPuppy

[AtlasPilotPuppy]

I have started with the decimal implementation. Since it's my introduction to this code base getting setup took a while.

[forsaken628]

https://www.postgresql.org/docs/current/functions-formatting.html#FUNCTIONS-FORMATTING-NUMERIC-TABLE
https://www.postgresql.org/docs/current/locale.html

How far do we have to go to support the locale part of this feature?