[GitHub] [arrow-datafusion] vincev commented on pull request #5214: Add support to SQL parser for unnest function.

["vincev (via GitHub)" <gi...@apache.org>]

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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