Column level lineage not drawn properly when metadata is provided

[piekill]

Describe the bug
When I provide the metadata, the printed column level lineage is correct, but the figure generated doesn't contain this information.
Printed column lineage:
<default>.res.c1 <- db1.tab1.c1

SQL

insert into res
select c1
from db1.tab1 a join db1.tab2 b

To Reproduce

from sqllineage.core.metadata.dummy import DummyMetaDataProvider
from sqllineage.runner import LineageRunner

sql = """
insert into res
select c1
from db1.tab1 a join db1.tab2 b
"""
lr = LineageRunner(sql, metadata_provider=DummyMetaDataProvider({"db1.tab1": ["c1"], "db1.tab2": ["c2"]}))
lr.print_column_lineage()
lr.draw()

Expected behavior
If I use the following sql (replace c1 with a.c1):

insert into res
select a.c1
from db1.tab1 a join db1.tab2 b

I can get the expected figure (the printed column lineage is the same):

Python version (available via python --version)

• 3.11.8

SQLLineage version (available via sqllineage --version):

• 1.5.2

Updated
I think the reason is that metadata provider is not currently used in visualization:

sqllineage/sqllineage/drawing.py

Line 168 in 5b7173e

lr = LineageRunner(sql, dialect=dialect, verbose=True)

I can get the expected behavior if I manually set the metadata_provider here. I guess there could be a better way of doing this.

[reata]

Thanks for reporting this issue. I don't think we carefully designed for frontend visualization back when developing metadata providers.

As you mentioned, we do need a more clever way to let the web server "remember" the metadata provider instead of hard code it in /lineage controller.