fix(xugu): match primary keys across catalog case

agents/drivers/xugu/main.go

@@ -2765,7 +2765,7 @@ func (s *server) getColumns(schema, table string) ([]columnInfo, error) {
 		item.DataType = normalizeXuguColumnType(item.DataType, varying)
 		item.IsNullable = !truthy(notNull)
 		item.DefaultOnNull = xuguInt(onNull)
-		item.IsPrimaryKey = primaryKeys[item.Name]
+		item.IsPrimaryKey = xuguPrimaryKeyMatches(item.Name, primaryKeys)
 		item.NumericPrecision, item.NumericScale, item.CharacterMaximumLength = decodeXuguScale(item.DataType, scale)
 		result = append(result, item)
 	}
@@ -2802,7 +2802,7 @@ func (s *server) columnsFromSelect(schema, table string, primaryKeys map[string]
 		item := columnInfo{
 			Name:         columnType.Name(),
 			DataType:     columnType.DatabaseTypeName(),
-			IsPrimaryKey: primaryKeys[columnType.Name()],
+			IsPrimaryKey: xuguPrimaryKeyMatches(columnType.Name(), primaryKeys),
 		}
 		if nullable, ok := columnType.Nullable(); ok {
 			item.IsNullable = nullable
@@ -2860,6 +2860,24 @@ func (s *server) primaryKeyColumns(schema, table string) (map[string]bool, error
 	return result, rows.Err()
 }
 
+// Xugu may report an unquoted primary-key name with a different case from
+// ALL_COLUMNS (for example, DEFINE contains "ID" while COL_NAME is "id").
+// Exact matches always win so quoted identifiers that differ only by case stay
+// distinct; a case-insensitive fallback is used only when it identifies one
+// primary-key column.
+func xuguPrimaryKeyMatches(columnName string, primaryKeys map[string]bool) bool {
+	if primaryKeys[columnName] {
+		return true
+	}
+	matches := 0
+	for primaryKey := range primaryKeys {
+		if strings.EqualFold(primaryKey, columnName) {
+			matches++
+		}
+	}
+	return matches == 1
+}
+
 func (s *server) listIndexes(schema, table string) ([]indexInfo, error) {
 	catalogSchema, catalogTable, err := s.resolveCatalogTableName(schema, table)
 	if err != nil {

agents/drivers/xugu/main_test.go

@@ -949,6 +949,23 @@ func TestGetColumnsFallsBackWhenOnNullMetadataIsUnavailable(t *testing.T) {
 	}
 }
 
+func TestXuguPrimaryKeyMatchesColumnCaseWhenCatalogsDisagree(t *testing.T) {
+	primaryKeys := map[string]bool{"ID": true}
+	if !xuguPrimaryKeyMatches("id", primaryKeys) {
+		t.Fatal("expected an unquoted primary key to match the column despite case differences")
+	}
+	if !xuguPrimaryKeyMatches("ID", primaryKeys) {
+		t.Fatal("expected an exact primary-key match")
+	}
+}
+
+func TestXuguPrimaryKeyMatchingDoesNotGuessAmbiguousCase(t *testing.T) {
+	primaryKeys := map[string]bool{"ID": true, "id": true}
+	if xuguPrimaryKeyMatches("Id", primaryKeys) {
+		t.Fatal("must not choose between primary-key names that differ only by case")
+	}
+}
+
 func TestIndexSQLUsesLowPrivilegeDictionary(t *testing.T) {
 	sqlText := strings.ToUpper(xuguListIndexesSQL)