seems fine

r5-java/src/main/java/propertymap/Parquet.java

@@ -59,9 +59,15 @@ public class Parquet {
     /** Load places deduplicated by lat/lon, write reference parquet, return names + flat lat/lon arrays. */
     static Places loadPlaces(String parquetPath, Path refOut) throws Exception {
         try (DuckDBConnection conn = connect(); Statement stmt = conn.createStatement()) {
+            stmt.execute("CREATE TABLE all_places AS SELECT * FROM read_parquet('"
+                + escapePath(parquetPath) + "')");
+            boolean hasTravelDestination = tableHasColumn(stmt, "all_places", "travel_destination");
+            String source = hasTravelDestination
+                ? "(SELECT * FROM all_places WHERE COALESCE(travel_destination, true))"
+                : "all_places";
             stmt.execute("CREATE TABLE places AS SELECT * EXCLUDE (rn) FROM ("
                 + "SELECT *, ROW_NUMBER() OVER (PARTITION BY lat, lon) AS rn "
-                + "FROM read_parquet('" + escapePath(parquetPath) + "')) WHERE rn = 1");
+                + "FROM " + source + " AS p) WHERE rn = 1");
             copyToParquet(stmt, "SELECT * FROM places", refOut);
 
             try (ResultSet rs = stmt.executeQuery("SELECT COUNT(*) FROM places")) {
@@ -85,6 +91,17 @@ public class Parquet {
         }
     }
 
+    private static boolean tableHasColumn(Statement stmt, String tableName, String columnName)
+            throws Exception {
+        try (ResultSet rs = stmt.executeQuery(
+                "SELECT COUNT(*) FROM information_schema.columns "
+                    + "WHERE table_name = '" + tableName + "' "
+                    + "AND column_name = '" + columnName + "'")) {
+            rs.next();
+            return rs.getInt(1) > 0;
+        }
+    }
+
     /** Write postcode travel times as a ZSTD-compressed parquet (atomic via tmp + rename). */
     static void writeTravelTimes(DuckDBConnection conn, Path outPath, String[] postcodes, short[] times)
             throws Exception {