soumyava commented on PR #14943:
URL: https://github.com/apache/druid/pull/14943#issuecomment-1714758452

   LGTM. One question, is there a way say I have a column of encoded strings. 
Atm I understand the function works on string values. Not this PR but can we 
later try to make it work on a column too ? Will that be useful ? Something 
like `SELECT DECODE_BASE64_UTF8("<column>") FROM <table>`. Currently this 
throws an error like 
   ```
   SELECT DECODE_BASE64_UTF8("dim1") FROM foo
   
   Error: RUNTIME_FAILURE (OPERATOR)
   Illegal base64 character 2e
   java.lang.IllegalArgumentException
   ```
   So might want to think about a better error message. But need not be done in 
context of this PR


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