Dialect Postgresql, union lineage only pick up last unioned table

[sluofoss]

Consider the following SQL:

select ca as c from a
union all
select cb as c from b
union all
select cc as c from c

running

node = lineage("c",file_content,dialect = Dialects.POSTGRES)
meta = LineageHTML(node)

only shows the last unioned table, ideally it should show all of them?

---

Code snippet to reproduce:

import sqlglot
from sqlglot.lineage import lineage, LineageHTML
from sqlglot.dialects.dialect import Dialects


file_content = """
select ca as c from a
union all
select cb as c from b
union all
select cc as c from c
"""

node = lineage("c",file_content,dialect = Dialects.POSTGRES)

meta = LineageHTML(node)

with open("./eg.html", 'w') as file:
    # Write the string to the file
    file.write(str(meta))

https://sqlglot.com/sqlglot/lineage.html