Refactor to avoid code duplication

index.html

@@ -119,28 +119,34 @@
 				return textTypes.some(t => type.toUpperCase().startsWith(t));
 			}
 
+			// Load dataset: initialize DuckDB, drop old file, and register new parquet file
+			async function loadDataset(url) {
+				// Initialize DuckDB if not already done
+				if (!db) {
+					await initDuckDB();
+				}
+
+				// Drop existing file registration if it exists
+				try {
+					await db.dropFile('data.parquet');
+				} catch {}
+
+				// Register the parquet file from URL
+				await db.registerFileURL(
+					'data.parquet',
+					url,
+					duckdb.DuckDBDataProtocol.HTTP,
+					false
+				);
+			}
+
 			// Detect columns and their types from the dataset
 			async function detectColumns(url) {
 				try {
 					setStatus('Detecting column types...', 'info');
 
-					// Initialize DuckDB if not already done
-					if (!db) {
-						await initDuckDB();
-					}
-
-					// Drop existing file registration if it exists
-					try {
-						await db.dropFile('data.parquet');
-					} catch {}
-
-					// Register the parquet file
-					await db.registerFileURL(
-						'data.parquet',
-						url,
-						duckdb.DuckDBDataProtocol.HTTP,
-						false
-					);
+					// Load the dataset
+					await loadDataset(url);
 
 					// Query to get column information
 					const result = await conn.query("DESCRIBE 'data.parquet'");
@@ -341,29 +347,8 @@
 				try {
 					submitBtn.disabled = true;
 					submitBtn.textContent = 'Loading...';
-					setStatus('Initializing DuckDB...', 'info');
-
-					// Initialize DuckDB if not already done
-					if (!db) {
-						await initDuckDB();
-					}
-
-					setStatus('Loading parquet file...', 'info');
-
-					// Drop existing file registration if it exists
-					try {
-						await db.dropFile('data.parquet');
-					} catch {}
-
-					// Register the parquet file from URL
-					await db.registerFileURL(
-						'data.parquet',
-						parquetUrl,
-						duckdb.DuckDBDataProtocol.HTTP,
-						false
-					);
 
-					// Detect columns and populate visualization dropdown
+					// Load dataset and detect columns
 					currentDatasetUrl = parquetUrl;
 					await detectColumns(parquetUrl);