Athena UDF lambda, An error occurred during JSON parsing

Question

I create lambda function to be used in athena UDF.

```
USING EXTERNAL FUNCTION decrypt(variable1 VARBINARY)
RETURNS VARCHAR
LAMBDA 'LambdaFunctionName'
SELECT  decrypt(amount) FROM "database"."table_name" limit 10;
```
but it give error 
```
GENERIC_USER_ERROR: io.trino.spi.TrinoException: Encountered an exception[java.lang.RuntimeException] from your LambdaFunction[LambdaFunctionName] executed in context[ping] with message[An error occurred during JSON parsing]
```

my lambda function using java code, the class extend `UserDefinedFunctionHandler` and the code something like this
```
 public String decrypt(String input) {
        byte[] valueByte = input.getBytes();
        String result = decryptByte(valueByte);
        return result;
    }
```
even when i change  VARBINARY to VARCHAR, and change the query parameter to some string like `SELECT  decrypt('somestring')` it still give the same  JSON parsing error

Chaitu · Answer

Hello,

I understand that you are seeing error when trying to run the UDF using Lambda function.

Could you please have a look at the Cloudwatch logs of the lambda function? We might be able to gather some more information from it. Instead of this vague message [An error occurred during JSON parsing], we should be able to see few more details about why it had failed.

Athena UDF lambda, An error occurred during JSON parsing

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