crepererum commented on issue #12921:
URL: https://github.com/apache/datafusion/issues/12921#issuecomment-2416274540

   Oh 🤦, I think I've tripped over the quoting then. I can never remember which 
is the string and which one is the identifier in SQL. In that case, the error 
message is actually correct, since my query tries to index the struct with a 
dynamic string from column `b`, which doesn't exist. The intention was to index 
with a static string `'b'` (as you suggested). So that's not actually a bug. 


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