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chore: Add UnboundColumn to carry datatype for unbound reference #518
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| This is proposed to fix the issue in #403 when upgrading to latest DataFusion. | 
| Ok(self.datatype.clone()) | ||
| } | ||
|  | ||
| /// Decide whehter this expression is nullable, given the schema of the input | 
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nit: whehter typo
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Oops
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I copied it from DataFusion. 😂
| Codecov ReportAll modified and coverable lines are covered by tests ✅ 
 Additional details and impacted files@@             Coverage Diff              @@
##               main     #518      +/-   ##
============================================
+ Coverage     34.05%   34.07%   +0.02%     
+ Complexity      859      809      -50     
============================================
  Files           116      105      -11     
  Lines         38679    38509     -170     
  Branches       8567     8552      -15     
============================================
- Hits          13173    13123      -50     
+ Misses        22745    22643     -102     
+ Partials       2761     2743      -18     ☔ View full report in Codecov by Sentry. | 
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LGTM.
Do we need to contribute the UnboundColumn back to DataFusion?
| 
 DataFusion doesn't need it. | 
| Merged. Thanks @huaxingao @advancedxy | 
…che#518) * chore: Add UnboundColumn to carry datatype for unbound reference * Update core/src/execution/datafusion/expressions/unbound.rs
Which issue does this PR close?
Closes #511.
Rationale for this change
What changes are included in this PR?
How are these changes tested?