diff --git a/backend-spring/src/main/java/com/erp/service/TableManagementService.java b/backend-spring/src/main/java/com/erp/service/TableManagementService.java
index 138064c6..af045a51 100644
--- a/backend-spring/src/main/java/com/erp/service/TableManagementService.java
+++ b/backend-spring/src/main/java/com/erp/service/TableManagementService.java
@@ -10,7 +10,6 @@ import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import java.sql.SQLException;
 import java.util.*;
 import java.util.stream.Collectors;
 
@@ -942,20 +941,6 @@ public class TableManagementService extends BaseService {
     @SuppressWarnings("unchecked")
     private List<String> parseColumnArray(Object cols) {
         if (cols instanceof List) return (List<String>) cols;
-        if (cols instanceof java.sql.Array arr) {
-            try {
-                Object raw = arr.getArray();
-                if (raw instanceof Object[] arrObj) {
-                    return Arrays.stream(arrObj)
-                            .filter(Objects::nonNull)
-                            .map(Object::toString)
-                            .filter(s -> !s.isBlank())
-                            .collect(Collectors.toList());
-                }
-            } catch (SQLException e) {
-                log.warn("parseColumnArray: java.sql.Array decode 실패 — fallback", e);
-            }
-        }
         if (cols instanceof String s) {
             return Arrays.stream(s.replace("{", "").replace("}", "").split(","))
                     .filter(c -> !c.isBlank())
diff --git a/backend-spring/src/main/resources/mapper/tableManagement.xml b/backend-spring/src/main/resources/mapper/tableManagement.xml
index 239f6c8d..845fc12a 100644
--- a/backend-spring/src/main/resources/mapper/tableManagement.xml
+++ b/backend-spring/src/main/resources/mapper/tableManagement.xml
@@ -389,7 +389,7 @@
   <select id="getTablePrimaryKeyList" parameterType="map" resultType="map">
     SELECT
         TC.CONNAME AS constraint_name
-        , ARRAY_AGG(A.ATTNAME ORDER BY X.N) AS columns
+        , ARRAY_AGG(A.ATTNAME ORDER BY X.N)::text AS columns
     FROM PG_CONSTRAINT TC
     JOIN PG_CLASS C
       ON TC.CONRELID = C.OID
@@ -411,7 +411,7 @@
     SELECT
         I.RELNAME AS index_name
         , IX.INDISUNIQUE AS is_unique
-        , ARRAY_AGG(A.ATTNAME ORDER BY X.N) AS columns
+        , ARRAY_AGG(A.ATTNAME ORDER BY X.N)::text AS columns
     FROM PG_INDEX IX
     JOIN PG_CLASS T
       ON IX.INDRELID = T.OID