feat!: annotation support for LOCALTIME function

[AbhishekASLK]

This PR ensures LOCALTIME expressions are correctly resolved to DataType.Type.TIME by adding exp.Localtime to the expression metadata, fixing an issue where they were previously annotated as UNKNOWN

Before:

Select(
  expressions=[
    Localtime(_type=DataType(this=Type.UNKNOWN))],
  _type=DataType(this=Type.UNKNOWN))

After:

Select(
  expressions=[
    Localtime(_type=DataType(this=Type.TIME))],
  _type=DataType(this=Type.UNKNOWN))

[VaggelisD]

Hey @AbhishekASLK, I'd generally expect that LOCALTIME does evaluates to a TIME type across all dialects but from a quick search it might not be the case e.g MySQL seems to produce a timestamp:

mysql> select LOCALTIME;
+---------------------+
| LOCALTIME           |
+---------------------+
| 2026-01-05 12:01:09 |
+---------------------+

We should only annotate an expression "globally" (i.e in __init__.py) if that's the case for all dialects

[AbhishekASLK]

Hey @AbhishekASLK, I'd generally expect that LOCALTIME does evaluates to a TIME type across all dialects but from a quick search it might not be the case e.g MySQL seems to produce a timestamp:

mysql> select LOCALTIME;
+---------------------+
| LOCALTIME           |
+---------------------+
| 2026-01-05 12:01:09 |
+---------------------+

We should only annotate an expression "globally" (i.e in __init__.py) if that's the case for all dialects

So let me do it specific to dialects

[VaggelisD]

So let me do it specific to dialects

We can probably add mysql.py in typing/ and override that entry, but please do a pass over all dialects that support LOCALTIME, as is the usual suggestion.

[AbhishekASLK]

So let me do it specific to dialects

We can probably add mysql.py in typing/ and override that entry, but please do a pass over all dialects that support LOCALTIME, as is the usual suggestion.

Sure @VaggelisD I'll pass over all dialects for this.

[AbhishekASLK]

Dialects (returns time): postgres duckdb snowflake presto trino
Dialects (do not return time): mysql

postgres:

    localtime    
-----------------
 13:05:11.990461
(1 row)

duckdb

duckdb> select localtime;
┌──────────────┐
│ localtime    │
╞══════════════╡
│ 13:06:02.393 │
└──────────────┘

snowflake

LOCALTIME
05:11:01

presto
Documentation
localtime -> time

trino
Documentation

mysql

+---------------------+
| localtime           |
+---------------------+
| 2026-01-05 13:20:24 |
+---------------------+

[VaggelisD]

Nice, thanks!