matko commented on code in PR #964:
URL: https://github.com/apache/datafusion-python/pull/964#discussion_r1932064792
##########
python/datafusion/context.py:
##########
@@ -534,12 +543,20 @@ def sql(self, query: str, options: SQLOptions | None =
None) -> DataFrame:
Args:
query: SQL query text.
options: If provided, the query will be validated against these
options.
+ named_dfs: When provided, used to replace parameterized query
variables
+ in the query string.
Returns:
DataFrame representation of the SQL query.
"""
+ if named_dfs:
+ for alias, df in named_dfs.items():
+ df_sql = f"({df.logical_plan().to_sql()})"
+ query = query.replace(f"{{{alias}}}", df_sql)
Review Comment:
There are some annoying unintended side effects to this approach. Imagine
the following query
```sql
SELECT * FROM {alias} WHERE val="a string that happens to contain {alias} in
it"
```
Since this code just replaces all occurences of `{alias}` with an sql query
it'll do so in the WHERE part as well.
As far as I can tell, there would be no way to escape `{alias}` in such a
way that the replacement does not occur.
This is obviously a contrived example, and it might be that this is
acceptable.
##########
src/functions.rs:
##########
@@ -282,6 +283,16 @@ fn find_window_fn(name: &str, ctx:
Option<PySessionContext>) -> PyResult<WindowF
return Ok(agg_fn);
}
+ // search default window functions
Review Comment:
It is not clear to me how this relates to the rest of the change.
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