Fix projection loss in create_physical_plan

The create_physical_plan method was creating a fresh VortexSource and
replacing the one in the FileScanConfig that already had projections,
filters, and other settings pushed down. This caused queries to return
all columns instead of just the projected ones.

Fix by using the FileScanConfig directly, since the VortexSource within
it was already set up by file_source() and try_pushdown_projection().

Author: lukekim

vortex-datafusion/src/persistent/format.rs

@@ -28,7 +28,6 @@ use datafusion_datasource::file_compression_type::FileCompressionType;
 use datafusion_datasource::file_format::FileFormat;
 use datafusion_datasource::file_format::FileFormatFactory;
 use datafusion_datasource::file_scan_config::FileScanConfig;
-use datafusion_datasource::file_scan_config::FileScanConfigBuilder;
 use datafusion_datasource::file_sink_config::FileSinkConfig;
 use datafusion_datasource::sink::DataSinkExec;
 use datafusion_datasource::source::DataSourceExec;