rfctr(csv): accommodate single column CSV files (#3483)

**Summary** Improve factoring, type-annotation, and tests for `partition_csv()` and accommodate single-column CSV files. Fixes: #2616
Unstructured-IO · Aug 6, 2024 · a468b2d · a468b2d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,13 +1,13 @@
-## 0.15.2-dev0
+## 0.15.2-dev1
 
 ### Enhancements
 
 ### Features
 
-
 ### Fixes
 
 * **Renames Astra to Astra DB** Conforms with DataStax internal naming conventions.
+* **Accommodate single-column CSV files.** Resolves a limitation of `partition_csv()` where delimiter detection would fail on a single-column CSV file (which naturally has no delimeters).
 
 ## 0.15.1
 

diff --git a/example-docs/semicolon-delimited.csv b/example-docs/semicolon-delimited.csv
@@ -0,0 +1,5 @@
+Lorem, ipsum; dolor sit; amet
+consectetur; adipiscing; elit
+sed, do; eiusmod; tempor incididunt
+ut labore; et, dolore; magna aliqua
+Ut enim; ad minim; veniam, quis
diff --git a/example-docs/single-column.csv b/example-docs/single-column.csv
@@ -0,0 +1,9 @@
+Lorem, ipsum
+dolor sit
+amet consectetur
+adipiscing, elit
+sed, do eiusmod
+tempor incididunt
+ut labore et
+dolore; magna aliqua
+Ut enim, ad minim, veniam
diff --git a/example-docs/stanley-cups.csv b/example-docs/stanley-cups.csv
@@ -2,4 +2,4 @@ Stanley Cups,,
 Team,Location,Stanley Cups
 Blues,STL,1
 Flyers,PHI,2
-Maple Leafs,TOR,13
+Maple Leafs,TOR,13