Athena error COLUMN_NOT_FOUND on certain columns

Question

Hi, I have a question about how athena columns listing works, since in my schema and my table I have for example a column called 'anonymousId' (and I can see it directly on the athena panel at the left side where you can see all the columns and its types) but when I try to query it I got the error *COLUMN_NOT_FOUND: Column 'anonymousid' cannot be resolved or requester is not authorized to access requested resources*
But I can query other columns that are also on the same schema.
Why athena can query some columns but others no?

Answer

The error you are encountering, "`COLUMN_NOT_FOUND: Column 'anonymousid' cannot be resolved or requester is not authorized to access requested resources`" suggests that there might be an issue with 1/ how the column name is being referenced in your query or 2/ with the permissions granted to your user for accessing that column in Amazon Athena.

Here are a some ways to troubleshoot:
1. Check Column Name Casing: Athena is case-sensitive when it comes to column names. You mentioned that the column is named `anonymousId` but the error message shows `anonymousid` (without the capital 'I'). Make sure you are using the exact same casing when referencing the column in your query. 
2. Permissions: Verify that your user has the necessary permissions to access the `anonymousId` column in Athena. Permissions can be controlled using AWS Identity and Access Management (IAM) roles and policies. Ensure that your IAM role or user has the appropriate permissions to read the data in that column.
3. Data Type Compatibility: Ensure that the data type of the 'anonymousId' column in your query matches the actual data type of the column in your table. Data type mismatches can also result in errors.

Athena error COLUMN_NOT_FOUND on certain columns

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