birschick-bq commented on code in PR #2018:
URL: https://github.com/apache/arrow-adbc/pull/2018#discussion_r1739227696


##########
csharp/src/Drivers/Apache/Spark/README.md:
##########
@@ -66,7 +69,34 @@ The following table depicts how the Spark ADBC driver 
converts a Spark type to a
 | USER_DEFINED         | String     | string |
 | VARCHAR              | String     | string |
 
-\* Complex types are returned as strings<br>
+### Apache Spark over HTTP
+
+| Spark Type           | Arrow Type | C# Type |
+| :---                 | :---:      | :---:   |
+| ARRAY*               | String     | string  |
+| BIGINT               | Int64      | long |
+| BINARY               | Binary     | byte[] |
+| BOOLEAN              | Boolean    | bool |
+| CHAR                 | String     | string |
+| DATE*                | *String*   | *string* |
+| DECIMAL*             | *String*   | *string* |

Review Comment:
   @CurtHagenlocher 
   This is a "Thrift" limitation - if we don't do any further conversion. We 
have the opportunity to convert the string types to native type - at the 
expense of memory/performance. Should we do always do the conversion on the 
client driver? Or possibly allow an option to decide?



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