paleolimbot commented on code in PR #3623:
URL: https://github.com/apache/arrow-adbc/pull/3623#discussion_r3236851674


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c/include/arrow-adbc/adbc.h:
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@@ -2293,6 +2296,36 @@ AdbcStatusCode AdbcStatementExecuteSchema(struct 
AdbcStatement* statement,
                                           struct ArrowSchema* schema,
                                           struct AdbcError* error);
 
+/// \brief Request the schema of the next statement execution
+///
+/// Allows the caller to request a specific schema based on prior

Review Comment:
   Good point...I will try to update the text tonight. Off the top of my head 
the ability to request a schema with more columns than the source or in a 
different order is useful, as is widening the allowed nullability. Requesting 
fewer columns is fishy. DataFusion has quite a nice programmatic definition of 
this (designed for casting struct columns to match each other, possibly from 
multiple Parquet files).



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