fix(nl2sql): modify the primary key processing logic to support list … (#2395)

fix(nl2sql): modify the primary key processing logic to support list and string types

Author: zxuexingzhijie

spring-ai-alibaba-nl2sql/spring-ai-alibaba-nl2sql-chat/src/main/java/com/alibaba/cloud/ai/service/base/BaseSchemaService.java

@@ -277,9 +277,17 @@ protected List<TableDTO> buildTableListFromDocuments(List<Document> documents) {
 			dto.setName((String) meta.get("name"));
 			dto.setDescription((String) meta.get("description"));
 			if (meta.containsKey("primaryKey")) {
-				String primaryKey = (String) meta.get("primaryKey");
-				if (StringUtils.isNotBlank(primaryKey)) {
-					dto.setPrimaryKeys(List.of(primaryKey));
+				Object primaryKeyObj = meta.get("primaryKey");
+				if (primaryKeyObj instanceof List) {
+					@SuppressWarnings("unchecked")
+					List<String> primaryKeys = (List<String>) primaryKeyObj;
+					dto.setPrimaryKeys(primaryKeys);
+				}
+				else if (primaryKeyObj instanceof String) {
+					String primaryKey = (String) primaryKeyObj;
+					if (StringUtils.isNotBlank(primaryKey)) {
+						dto.setPrimaryKeys(List.of(primaryKey));
+					}
 				}
 			}
 			tableList.add(dto);