Jefffrey commented on code in PR #17109:
URL: https://github.com/apache/datafusion/pull/17109#discussion_r2265133603


##########
datafusion/sqllogictest/src/engines/datafusion_engine/error.rs:
##########
@@ -28,7 +28,7 @@ pub type Result<T, E = DFSqlLogicTestError> = 
std::result::Result<T, E>;
 pub enum DFSqlLogicTestError {
     /// Error from sqllogictest-rs
     #[error("SqlLogicTest error(from sqllogictest-rs crate): {0}")]
-    SqlLogicTest(#[from] TestError),
+    SqlLogicTest(#[from] Box<TestError>),

Review Comment:
   I don't think this matters too much since it's sqllogictest stuff?



##########
clippy.toml:
##########
@@ -9,4 +9,14 @@ disallowed-types = [
 
 # Lowering the threshold to help prevent stack overflows (default is 16384)
 # See: https://rust-lang.github.io/rust-clippy/master/index.html#/large_futures
-future-size-threshold = 10000
\ No newline at end of file
+future-size-threshold = 10000
+
+# Be more aware of large error variants which can impact the "happy path" due
+# to large stack footprint when considering async state machines (default is 
128).
+#
+# Value of 70 picked arbitrarily as something less than 100.
+#
+# See:
+# - https://github.com/apache/datafusion/issues/16652
+# - https://rust-lang.github.io/rust-clippy/master/index.html#result_large_err
+large-error-threshold = 70

Review Comment:
   Initially I picked 64, but there were some error variants that were 
_exactly_ 64 and got flagged, hence increased to 70



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