westhide commented on code in PR #15311:
URL: https://github.com/apache/datafusion/pull/15311#discussion_r2004474014


##########
datafusion/proto/src/physical_plan/mod.rs:
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@@ -247,6 +247,15 @@ impl AsExecutionPlan for protobuf::PhysicalPlanNode {
                 .with_file_compression_type(FileCompressionType::UNCOMPRESSED);
                 Ok(conf.build())
             }
+            PhysicalPlanType::JsonScan(scan) => {

Review Comment:
   Currently batch_size will set by `context.session_config().batch_size()` 
when DataSource call `open(..)`, serialization batch_size will let the 
JsonSource use client config instead of the Executor session_config in 
Ballista. Should we change this behavior for all file 
format(`csv`,`parquert`,`avro`...)?
   
https://github.com/apache/datafusion/blob/19dd46d3c65e3160c0fb949880bc3e960434e96d/datafusion/datasource/src/file_scan_config.rs#L182



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