Fix reading from multiple collections. (#267)

Co-authored-by: Alexander Lowey-Weber <[email protected]>
heremaps · May 22, 2024 · a9b8608 · a9b8608
1 parent 6cc5acd
commit a9b8608
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/here-naksha-lib-psql/src/main/java/com/here/naksha/lib/psql/PostgresSession.java b/here-naksha-lib-psql/src/main/java/com/here/naksha/lib/psql/PostgresSession.java
@@ -533,7 +533,13 @@ Result executeRead(@NotNull ReadRequest<?> readRequest) {
       }
       final String props_where = sql.toString();
       sql.setLength(0);
+      boolean first = true;
       for (final String collection : collections) {
+        if (first) {
+          first = false;
+        } else {
+          sql.add(" UNION ALL ");
+        }
         SQL headQuery = prepareQuery(collection, spatial_where, props_where, readFeatures.getLimit());
         sql.add(headQuery);
         if (readFeatures.isReturnAllVersions()) {