[GitHub] [arrow-datafusion] gandronchik commented on issue #2083: Error occurs when using union in query

[GitBox <gi...@apache.org>]

gandronchik commented on issue #2083:
URL: https://github.com/apache/arrow-datafusion/issues/2083#issuecomment-1108443457

   It doesn't work in the current version.
   `select 1 union select 2;`
   ArrowError(ExternalError(Execution("Arrow error: External error: Internal error: Unsupported data type in hasher: Null. This was likely caused by a bug in DataFusion's code and we would welcome that you file an bug report in our issue tracker")))
   
   `SELECT 1 a UNION ALL SELECT 2;`
   ```
   +-------------+
   | placeholder |
   +-------------+
   |             |
   | 1           |
   +-------------+
   ```
   
   I fixed it. Now result is:
   `select 1 union select 2;`
   ```
   +----------+
   | Int64(1) |
   +----------+
   | 2        |
   | 1        |
   +----------+
   ```
   
   `SELECT 1 a UNION ALL SELECT 2;`
   ```
   +---+
   | a |
   +---+
   | 1 |
   | 2 |
   +---+
   ```
   


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