markap14 commented on a change in pull request #3223: NIFI-5903: Allow
RecordPath to be used in QueryRecord processor. Also…
URL: https://github.com/apache/nifi/pull/3223#discussion_r255561877
##########
File path:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/QueryRecord.java
##########
@@ -640,4 +667,233 @@ public Connection getConnection() {
return connection;
}
}
+
+
+ // ------------------------------------------------------------
+ // User-Defined Functions for Calcite
+ // ------------------------------------------------------------
+
+
+ public static class ObjectRecordPath extends RecordPathFunction {
+ public Object eval(Object record, String recordPath) {
+ if (record == null) {
+ return null;
+ }
+
+ if (record instanceof Record) {
+ return eval((Record) record, recordPath);
+ }
+ if (record instanceof Record[]) {
+ return eval((Record[]) record, recordPath);
+ }
+
+ throw new RuntimeException("Cannot evaluate RecordPath " +
recordPath + " against given argument because the argument is of type " +
record.getClass() + " instead of Record");
+ }
+
+ private Object eval(final Record record, final String recordPath) {
+ final RecordPath compiled =
RECORD_PATH_CACHE.getCompiled(recordPath);
+ final RecordPathResult result = compiled.evaluate((Record) record);
+
+ final List<FieldValue> selectedFields =
result.getSelectedFields().collect(Collectors.toList());
+ if (selectedFields.isEmpty()) {
+ return null;
+ }
+
+ if (selectedFields.size() == 1) {
+ return selectedFields.get(0).getValue();
+ }
+
+ return selectedFields.stream()
+ .map(FieldValue::getValue)
+ .toArray();
+ }
+
+ // TODO: Test this
Review comment:
Pushed another commit to address.
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