feat: add fcs method

exon/exon-core/src/datasources/exon_listing_table_factory.rs

@@ -321,7 +321,7 @@ impl ExonListingTableFactory {
 
                 let table_schema = options.infer_schema(state, &table_path).await?;
 
-                let config = ListingFCSTableConfig::new(table_path).with_options(options);
+                let config = ListingFCSTableConfig::new(table_path, options);
                 let table = ListingFCSTable::try_new(config, table_schema)?;
 
                 Ok(Arc::new(table))

exon/exon-core/src/datasources/fcs/table_provider.rs

@@ -49,23 +49,15 @@ use super::scanner::FCSScan;
 pub struct ListingFCSTableConfig {
     inner: ListingTableConfig,
 
-    options: Option<ListingFCSTableOptions>,
+    options: ListingFCSTableOptions,
 }
 
 impl ListingFCSTableConfig {
     /// Create a new VCF listing table configuration
-    pub fn new(table_path: ListingTableUrl) -> Self {
+    pub fn new(table_path: ListingTableUrl, options: ListingFCSTableOptions) -> Self {
         Self {
             inner: ListingTableConfig::new(table_path),
-            options: None,
-        }
-    }
-
-    /// Set the options for the VCF listing table
-    pub fn with_options(self, options: ListingFCSTableOptions) -> Self {
-        Self {
-            options: Some(options),
-            ..self
+            options,
         }
     }
 }
@@ -174,22 +166,17 @@ impl ListingFCSTableOptions {
 #[derive(Debug, Clone)]
 /// A FCS listing table
 pub struct ListingFCSTable {
-    table_paths: Vec<ListingTableUrl>,
-
     table_schema: TableSchema,
 
-    options: ListingFCSTableOptions,
+    config: ListingFCSTableConfig,
 }
 
 impl ListingFCSTable {
     /// Create a new FCS listing table
     pub fn try_new(config: ListingFCSTableConfig, table_schema: TableSchema) -> Result<Self> {
         Ok(Self {
-            table_paths: config.inner.table_paths,
             table_schema,
-            options: config
-                .options
-                .ok_or_else(|| DataFusionError::Internal(String::from("Options must be set")))?,
+            config,
         })
     }
 }
@@ -214,7 +201,7 @@ impl TableProvider for ListingFCSTable {
     ) -> Result<Vec<TableProviderFilterPushDown>> {
         Ok(filters
             .iter()
-            .map(|f| filter_matches_partition_cols(f, &self.options.table_partition_cols))
+            .map(|f| filter_matches_partition_cols(f, &self.config.options.table_partition_cols))
             .collect())
     }
 
@@ -225,7 +212,7 @@ impl TableProvider for ListingFCSTable {
         filters: &[Expr],
         limit: Option<usize>,
     ) -> Result<Arc<dyn ExecutionPlan>> {
-        let object_store_url = if let Some(url) = self.table_paths.first() {
+        let object_store_url = if let Some(url) = self.config.inner.table_paths.first() {
             url.object_store()
         } else {
             return Ok(Arc::new(EmptyExec::new(Arc::new(Schema::empty()))));
@@ -236,10 +223,10 @@ impl TableProvider for ListingFCSTable {
         let file_list = pruned_partition_list(
             state,
             &object_store,
-            &self.table_paths[0],
+            &self.config.inner.table_paths[0],
             filters,
-            self.options.file_extension.as_str(),
-            &self.options.table_partition_cols,
+            self.config.options.file_extension.as_str(),
+            &self.config.options.table_partition_cols,
         )
         .await?
         .try_collect::<Vec<_>>()
@@ -249,11 +236,15 @@ impl TableProvider for ListingFCSTable {
         let file_scan_config =
             FileScanConfigBuilder::new(object_store_url.clone(), file_schema, vec![file_list])
                 .projection_option(projection.cloned())
-                .table_partition_cols(self.options.table_partition_cols.clone())
+                .table_partition_cols(self.config.options.table_partition_cols.clone())
                 .limit_option(limit)
                 .build();
 
-        let plan = self.options.create_physical_plan(file_scan_config).await?;
+        let plan = self
+            .config
+            .options
+            .create_physical_plan(file_scan_config)
+            .await?;
 
         Ok(plan)
     }

exon/exon-core/src/datasources/fcs/udtf.rs

@@ -52,9 +52,10 @@ impl TableFunctionImpl for FCSScanFunction {
             Ok::<TableSchema, datafusion::error::DataFusionError>(schema)
         })?;
 
-        let listing_table_config =
-            ListingFCSTableConfig::new(listing_scan_function.listing_table_url)
-                .with_options(listing_table_options);
+        let listing_table_config = ListingFCSTableConfig::new(
+            listing_scan_function.listing_table_url,
+            listing_table_options,
+        );
 
         let listing_table = ListingFCSTable::try_new(listing_table_config, schema)?;
 

exon/exon-core/src/session_context/exon_context_ext.rs

@@ -327,6 +327,14 @@ pub trait ExonSessionExt {
         options: ListingCRAMTableOptions,
     ) -> Result<DataFrame, ExonError>;
 
+    /// Read an FCS file.
+    #[cfg(feature = "fcs")]
+    async fn read_fcs(
+        &self,
+        table_path: &str,
+        options: crate::datasources::fcs::table_provider::ListingFCSTableOptions,
+    ) -> Result<DataFrame, ExonError>;
+
     /// Read a GENBANK file.
     #[cfg(feature = "genbank")]
     async fn read_genbank(
@@ -370,6 +378,29 @@ impl ExonSessionExt for SessionContext {
         Ok(table)
     }
 
+    #[cfg(feature = "fcs")]
+    async fn read_fcs(
+        &self,
+        table_path: &str,
+        options: crate::datasources::fcs::table_provider::ListingFCSTableOptions,
+    ) -> Result<DataFrame, ExonError> {
+        use crate::datasources::fcs::table_provider::ListingFCSTableConfig;
+
+        let table_path = ListingTableUrl::parse(table_path)?;
+
+        let table_schema = options.infer_schema(&self.state(), &table_path).await?;
+
+        let config = ListingFCSTableConfig::new(table_path, options);
+        let table = crate::datasources::fcs::table_provider::ListingFCSTable::try_new(
+            config,
+            table_schema,
+        )?;
+
+        let table = self.read_table(Arc::new(table))?;
+
+        Ok(table)
+    }
+
     async fn read_cram(
         &self,
         table_path: &str,
@@ -889,6 +920,27 @@ mod tests {
         Ok(())
     }
 
+    #[cfg(feature = "fcs")]
+    #[tokio::test]
+    async fn test_read_fcs() -> Result<(), Box<dyn std::error::Error>> {
+        let ctx = SessionContext::new_exon();
+
+        let fcs_path = exon_test::test_path("fcs", "Guava Muse.fcs");
+
+        let df = ctx
+            .read_fcs(
+                fcs_path.to_str().unwrap(),
+                crate::datasources::fcs::table_provider::ListingFCSTableOptions::new(
+                    FileCompressionType::UNCOMPRESSED,
+                ),
+            )
+            .await?;
+
+        assert_eq!(df.count().await?, 108);
+
+        Ok(())
+    }
+
     #[tokio::test]
     async fn test_read_fasta_gzip() -> Result<(), Box<dyn std::error::Error>> {
         let ctx = SessionContext::new_exon();