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https://issues.apache.org/jira/browse/ARROW-8197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17065976#comment-17065976
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Andy Grove commented on ARROW-8197:
-----------------------------------
I ran into this same issue last night and I consider it a bug. The problem
code is here:
{code:java}
impl PhysicalExpr for Column {
/// Get the name to use in a schema to represent the result of this
expression
fn name(&self) -> String {
format!("c{}", self.index)
}
{code}
The physical expression for Column is just an index into the input batch and
the name should be the name of the input column. I will probably look at this
tonight unless you happen to beat me to it.
> [Rust] DataFusion "create_physical_plan" returns incorrect schema?
> ------------------------------------------------------------------
>
> Key: ARROW-8197
> URL: https://issues.apache.org/jira/browse/ARROW-8197
> Project: Apache Arrow
> Issue Type: Bug
> Components: Rust, Rust - DataFusion
> Affects Versions: 0.15.1
> Reporter: Paddy Horan
> Priority: Minor
>
> I am using DataFusion in a situation where I know there will only be a single
> file. DataFusion currently collects all batches into a vector.
> As I am writing the data back out I want to work with an iterator instead of
> a vector.
> I have something as follows:
> {code:java}
> let plan = ctx.create_logical_plan(&sql).unwrap();
> let plan = ctx.optimize(&plan).unwrap();
> dbg!(plan.schema()); // Returns field names
> let plan = ctx.create_physical_plan(&plan, batch_size).unwrap();
> dbg!(plan.schema()); // Returns c0, c1, etc{code}
> Maybe this is expected after turning the plan into a physical plan?
> I can change the schema of the returned batches, would this be the
> recommended way to address this or is there something in DataFusion I should
> leverage to do this?
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