Kimahriman opened a new pull request, #731:
URL: https://github.com/apache/datafusion-comet/pull/731
## Which issue does this PR close?
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Closes #730
## Rationale for this change
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To support struct types in expressions, you need to be able to pull out
values from structs, which Spark does through the GetStructField expression.
## What changes are included in this PR?
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Adds a new PhysicalExpr `GetStructField` that gets a field from within a
struct.
Additionally to support this and testing it:
- Moves supported type checking to have dedicated functions for
`CometScanExec` and `CometBatchScanExec` to different physical operators can
add support for various complex types on their own.
- Updates `CometRowToColumnar` to support columnar sources. This is so I can
use Spark's vectorized parquet read to read complex data, and then immediately
forward to Comet via `COMET_ROW_TO_COLUMNAR_SUPPORTED_OPERATOR_LIST`. I do this
in the UT I made.
## How are these changes tested?
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New UT showing comet operators take affect, existing Spark tests for
functionality
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