[PR] DRILL-8406: Enable implicit casting of VARCHAR and BIT args in aggregate functions (drill)

["jnturton (via GitHub)" <gi...@apache.org>]

jnturton opened a new pull request, #2768:
URL: https://github.com/apache/drill/pull/2768

   # [DRILL-8406](https://issues.apache.org/jira/browse/DRILL-8406): Enable implicit casting of VARCHAR and BIT args in aggregate functions
   
   ## Description
   
   Default function implementations that that throw unsupported operation exceptions in the class AggregateErrorFunctions prevent the implicit casting of VARCHAR and BIT arguments to neighbouring types. E.g.
   ```
   apache drill> select sum('1');
   Error: UNSUPPORTED_OPERATION ERROR: Only COUNT, MIN and MAX aggregate functions supported for VarChar type
   ```
   This PR removes AggregateErrorFunctions so that implicit casting works, the example above changing as follows.
   ```
   apache drill> select sum('1');
   EXPR$0  1
   1 row selected (2.346 seconds)
   ```
   
   ## Documentation
   N/A
   
   ## Testing
   New unit test.
   


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Re: [PR] DRILL-8406: Enable implicit casting of VARCHAR and BIT args in aggregate functions (drill)

["cgivre (via GitHub)" <gi...@apache.org>]

cgivre merged PR #2768:
URL: https://github.com/apache/drill/pull/2768


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