vincev commented on PR #5214:
URL:
https://github.com/apache/arrow-datafusion/pull/5214#issuecomment-1428279764
Just found a problem while adding more tests, if I run the following:
```rust
let ctx = SessionContext::new();
ctx.sql("create external table shapes stored as parquet location
'nested.parquet'").await?;
ctx.sql("select count(unnest(tags)) from shapes").await?.show().await;
```
I get the correct output:
```
+--------------------+
| COUNT(shapes.tags) |
+--------------------+
| 8 |
+--------------------+
```
but if I run the same query with `register_parquet`:
```rust
let ctx = SessionContext::new();
let df = ctx.register_parquet("shapes", "nested.parquet",
ParquetReadOptions::default()).await?;
ctx.sql("select count(unnest(tags)) from shapes").await?.show().await;
```
the `UnnestExec` gets optimized away somehow (its execute is not called) and
I get this:
```
+--------------------+
| COUNT(shapes.tags) |
+--------------------+
| 4 |
+--------------------+
```
I'll investigate.
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