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[MINOR]: Generate empty column at placeholder exec #8553

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merged 1 commit into from
Dec 15, 2023
Merged

[MINOR]: Generate empty column at placeholder exec #8553

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7 changes: 4 additions & 3 deletions datafusion/physical-plan/src/placeholder_row.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ use crate::{memory::MemoryStream, DisplayFormatType, ExecutionPlan, Partitioning
use arrow::array::{ArrayRef, NullArray};
use arrow::datatypes::{DataType, Field, Fields, Schema, SchemaRef};
use arrow::record_batch::RecordBatch;
use arrow_array::RecordBatchOptions;
use datafusion_common::{internal_err, DataFusionError, Result};
use datafusion_execution::TaskContext;

Expand Down Expand Up @@ -59,9 +60,7 @@ impl PlaceholderRowExec {
fn data(&self) -> Result<Vec<RecordBatch>> {
Ok({
let n_field = self.schema.fields.len();
// hack for https://github.com/apache/arrow-datafusion/pull/3242
let n_field = if n_field == 0 { 1 } else { n_field };
vec![RecordBatch::try_new(
vec![RecordBatch::try_new_with_options(
Arc::new(Schema::new(
(0..n_field)
.map(|i| {
Expand All @@ -75,6 +74,8 @@ impl PlaceholderRowExec {
ret
})
.collect(),
// Even if column number is empty we can generate single row.
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&RecordBatchOptions::new().with_row_count(Some(1)),
)?]
})
}
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6 changes: 6 additions & 0 deletions datafusion/sqllogictest/test_files/window.slt
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Expand Up @@ -3793,3 +3793,9 @@ select a,
----
1 1
2 1

query I
select rank() over (order by 1) rnk from (select 1 a union all select 2 a) x
----
1
1
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