connec commented on issue #11472:
URL: https://github.com/apache/datafusion/issues/11472#issuecomment-2235974826
Turns out `arrow-csv` does correctly parse newlines in quoted values, so the
issue comes from reading CSVs in parallel. Limiting the target number of
partitions to 1 solves the issue.
For example, if I add this to my code before I run `ctx.sql("SELECT * FROM
<csv including linebreaks>")` then the query executed successfully (without it
there are errors about wrong numbers of columns):
```rust
ctx.state_weak_ref()
.upgrade()
.unwrap()
.write_arc()
.config_mut()
.options_mut()
.execution
.target_partitions = 1;
```
From a UX perspective, this setting is quite disconnected from the intent.
It also required changing the session-level `target_partitions` setting, which
(I assume, untested) would adversely affect reads of CSVs that might not be
expected to contain linebreaks. A per-CSV `newlines_in_values` setting would
help to signpost this situation and allow more efficient plans when only some
executed CSVs have this requirement.
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