How do I resolve the "function not registered" syntax error in Amazon Athena?
When I run a SELECT operation in Amazon Athena, I get a "function not registered" syntax error.
Resolution
If you try to use a function that Athena doesn't support, then you receive an error that's similar to one of the following messages:
- "SYNTAX_ERROR: line 1:8: Function function_name not registered"
- "FUNCTION_NOT_FOUND: line 1:8: Function 'function_name' not registered"
For a list of functions that Athena supports, see Functions in Amazon Athena. Or, run the SHOW FUNCTIONS statement.
Example output snippet:
Function Return Type Argument Types Function Type Deterministic Description 1 abs bigint bigint scalar true absolute value 2 abs decimal(p,s) decimal(p,s) scalar true absolute value 3 abs double double
If Athena doesn't support the function that you want to use, then write a user defined function (UDF) in Athena.
Related information
Amazon Athena UDF Connector on the GitHub website
Connect Amazon Athena to your Apache Hive Metastore and use user-defined functions
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Function "regexp_count" listed as [part ](https://trino.io/docs/current/functions/regexp.html#:~:text=regexp_count(string,%23) of Athena but Athena still returns error: SYNTAX_ERROR: Function regexp_count not registered. Is this documentation issue?
Thank you for your comment. We'll review and update the Knowledge Center article as needed.
Getting the same error, bitwise_xor_agg is not registered, but listed at https://trino.io/docs/current/functions/aggregate.html#bitwise_xor_agg
Interestingly, bitwise_or_agg and bitwise_and_agg are registered, but not bitwise_xor_agg...which is either a coincidence or an amazing joke.
If it's the latter, then well played.
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