feat: Add VortexFormatFactory to the datafusion integration (#2159)

A piece of the `FileFormat` API, used to if we want to create a
DataFusion session and execute DDL statements like:
```sql
CREATE EXTERNAL TABLE tbl
STORED AS VORTEX
LOCATION '/path/to/data';"
```

Author: AdamGS

vortex-datafusion/src/persistent/format.rs

@@ -4,13 +4,14 @@ use std::sync::Arc;
 use arrow_schema::{Schema, SchemaRef};
 use async_trait::async_trait;
 use datafusion::datasource::file_format::file_compression_type::FileCompressionType;
-use datafusion::datasource::file_format::{FileFormat, FilePushdownSupport};
+use datafusion::datasource::file_format::{FileFormat, FileFormatFactory, FilePushdownSupport};
 use datafusion::datasource::physical_plan::{FileScanConfig, FileSinkConfig};
 use datafusion::execution::SessionState;
 use datafusion_common::parsers::CompressionTypeVariant;
 use datafusion_common::stats::Precision;
 use datafusion_common::{
-    not_impl_err, ColumnStatistics, DataFusionError, Result as DFResult, ScalarValue, Statistics,
+    not_impl_err, ColumnStatistics, DataFusionError, GetExt, Result as DFResult, ScalarValue,
+    Statistics,
 };
 use datafusion_expr::Expr;
 use datafusion_physical_expr::{LexRequirement, PhysicalExpr};
@@ -57,6 +58,35 @@ impl Default for VortexFormatOptions {
     }
 }
 
+/// Minimal factory to create [`VortexFormat`] instances.
+#[derive(Debug, Default)]
+pub struct VortexFormatFactory {}
+
+impl GetExt for VortexFormatFactory {
+    fn get_ext(&self) -> String {
+        VORTEX_FILE_EXTENSION.to_string()
+    }
+}
+
+impl FileFormatFactory for VortexFormatFactory {
+    #[allow(clippy::disallowed_types)]
+    fn create(
+        &self,
+        _state: &SessionState,
+        _format_options: &std::collections::HashMap<String, String>,
+    ) -> DFResult<Arc<dyn FileFormat>> {
+        Ok(self.default())
+    }
+
+    fn default(&self) -> Arc<dyn FileFormat> {
+        Arc::new(VortexFormat::default())
+    }
+
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+}
+
 impl Default for VortexFormat {
     fn default() -> Self {
         let opts = VortexFormatOptions::default();