devinjdangelo commented on code in PR #10224:
URL: https://github.com/apache/datafusion/pull/10224#discussion_r1579453268


##########
datafusion/common/src/config.rs:
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@@ -1383,6 +1386,20 @@ impl ConfigField for TableParquetOptions {
         // Determine the key if it's a global or column-specific setting
         if key.contains("::") {
             self.column_specific_options.set(key, value)
+        } else if key.eq("metadata") {
+            for maybe_pair in value.split('_') {

Review Comment:
   What does the `_` delimiter signify here? I didn't notice an example in the 
tests which included a `_` in the value.



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