fix #565: read ORDS vector body stream once

sql/adb/29_agent_ords_vector_search_ords.sql

@@ -48,19 +48,24 @@ BEGIN
     p_source         => q'!
 DECLARE
   v_rows           SYS_REFCURSOR;
+  v_body_text      CLOB;
   v_embedding_text VARCHAR2(32767);
 BEGIN
   cb_ords_handler_pkg.set_vpd_context(:auth_header);
 
+  -- ORDS exposes :body_text as a stream bind. Read it exactly once; referring
+  -- to the stream bind twice causes ORA-17270 (Duplicate stream parameter).
+  v_body_text := :body_text;
+
   -- JSON_QUERY accepts a numeric JSON array. The JSON_VALUE fallback also
   -- permits clients that send the vector as the text "[0.1,0.2,...]".
   v_embedding_text := JSON_QUERY(
-    :body_text,
+    v_body_text,
     '$.embedding' RETURNING VARCHAR2(32767)
   );
   IF v_embedding_text IS NULL THEN
     v_embedding_text := JSON_VALUE(
-      :body_text,
+      v_body_text,
       '$.embedding' RETURNING VARCHAR2(32767)
     );
   END IF;

src/test/java/com/cloudhandson/vpdbackoffice/web/GuidedFlowTemplateTest.java

@@ -126,6 +126,19 @@ class GuidedFlowTemplateTest {
         .contains("검색 기술 상세 보기");
   }
 
+  @Test
+  void vectorOrdsHandlerReadsBodyStreamOnlyOnce() throws IOException {
+    String sql = Files.readString(Path.of("sql/adb/29_agent_ords_vector_search_ords.sql"));
+
+    assertThat(sql)
+        .contains("v_body_text      CLOB")
+        .contains("v_body_text := :body_text")
+        .contains("Duplicate stream parameter")
+        .doesNotContain("JSON_QUERY(\n    :body_text")
+        .doesNotContain("JSON_VALUE(\n      :body_text");
+    assertThat(sql.split("v_body_text := :body_text", -1)).hasSize(2);
+  }
+
   private String template(String relativePath) throws IOException {
     return Files.readString(Path.of("src/main/resources/templates").resolve(relativePath));
   }