garro95 opened a new issue, #482:
URL: https://github.com/apache/arrow-ballista/issues/482

   **Describe the bug**
   A clear and concise description of what the bug is.
   The example at 
https://github.com/apache/arrow-datafusion/blob/master/ballista/rust/client/README.md#executing-a-query
 does not build
   
   **To Reproduce**
   Steps to reproduce the behavior:
   * Create a new cargo project with `cargo new ballista-example`
   * Add the three dependencies
   * Add the code
   * Run `cargo build`
   
   **Expected behavior**
   A clear and concise description of what you expected to happen.
   A successful build
   
   **Additional context**
   Add any other context about the problem here.
   
   The error is 
   ```
   error: failed to select a version for `zstd-safe`.
       ... required by package `zstd v0.9.0+zstd.1.5.0`
       ... which satisfies dependency `zstd = "^0.9"` of package `parquet 
v6.1.0`
       ... which satisfies dependency `parquet = "^6.1.0"` of package 
`datafusion v6.0.0`
       ... which satisfies dependency `datafusion = "^6.0.0"` of package 
`ballista v0.6.0`
       ... which satisfies dependency `ballista = "^0.6"` of package 
`ballista-example v0.1.0`
   versions that meet the requirements `=4.1.1` are: 4.1.1+zstd.1.5.0
   
   all possible versions conflict with previously selected packages.
   
     previously selected package `zstd-safe v4.1.4+zstd.1.5.2`
       ... which satisfies dependency `zstd-safe = "=4.1.4"` of package `zstd 
v0.10.0+zstd.1.5.2`
       ... which satisfies dependency `zstd = "^0.10"` of package `parquet 
v9.0.2`
       ... which satisfies dependency `parquet = "^9.0.0"` of package 
`datafusion v7.0.0`
       ... which satisfies dependency `datafusion = "^7.0"` of package 
`ballista-example v0.1.0`
   
   failed to select a version for `zstd-safe` which could resolve this conflict
   ```


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