nathanb9 commented on code in PR #22943:
URL: https://github.com/apache/datafusion/pull/22943#discussion_r3478433513


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datafusion/sql/src/expr/mod.rs:
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@@ -54,6 +54,13 @@ mod substring;
 mod unary_op;
 mod value;
 
+/// Multiplier applied to `datafusion.sql_parser.recursion_limit` to bound the
+/// depth of a binary-operator expression tree. A flat operator chain such as
+/// `a OR b OR c OR ...` only consumes a single level of parser recursion yet

Review Comment:
   Back from vacation!
   
   You're saying can we update the code to have recursion protection in parser 
level? That makes sense, ill make a separate issue for this. But I think we 
still need this check here too.
   
   There could still be an issue if its not a SQL input 
(DataFrame/Substrait/programmatic). sqlparser can be updated to have the 
recursion protection but couldnt other inputs cause this same issue if not 
checked?



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