ijokarumawak commented on issue #3478: NIFI-6304 added trim, toLowerCase and toUpperCase to record path oper… URL: https://github.com/apache/nifi/pull/3478#issuecomment-494622338 To explain why we need to return multiple converted FieldValues stream with `trim`, `toUpperCase` or `toLowerCase`, I suggest adding following test case: ```java @Test public void testTrimArray() { final List<RecordField> fields = new ArrayList<>(); final DataType dataType = new ArrayDataType(RecordFieldType.STRING.getDataType()); fields.add(new RecordField("names", dataType)); final RecordSchema schema = new SimpleRecordSchema(fields); final Map<String, Object> values = new HashMap<>(); values.put("names", new String[]{" John Smith ", " Jane Smith "}); final Record record = new MapRecord(schema, values); final List<FieldValue> results = RecordPath.compile("trim(/names[*])").evaluate(record).getSelectedFields().collect(Collectors.toList()); assertEquals("John Smith", results.get(0).getValue()); assertEquals("Jane Smith", results.get(1).getValue()); } ```
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