[nifi] branch main updated: NIFI-8512: When converting to/from Avro UNION type, we can be more efficient when the UNION consists of a Null type and one other type by determinine the non-null type and just using that. Also eliminated a call to List.stream() and related .collect() call by using an existing method that performs the logic without the very expensive call to stream()

[mattyb149]

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mattyb149 pushed a commit to branch main
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The following commit(s) were added to refs/heads/main by this push:
     new 2895bac  NIFI-8512: When converting to/from Avro UNION type, we can be 
more efficient when the UNION consists of a Null type and one other type by 
determinine the non-null type and just using that. Also eliminated a call to 
List.stream() and related .collect() call by using an existing method that 
performs the logic without the very expensive call to stream()
2895bac is described below

commit 2895bac2c088aa66c8b86ecba680f80e1323105a
Author: Mark Payne <marka...@hotmail.com>
AuthorDate: Mon May 3 17:49:36 2021 -0400

    NIFI-8512: When converting to/from Avro UNION type, we can be more 
efficient when the UNION consists of a Null type and one other type by 
determinine the non-null type and just using that. Also eliminated a call to 
List.stream() and related .collect() call by using an existing method that 
performs the logic without the very expensive call to stream()
    
    Signed-off-by: Matthew Burgess <mattyb...@apache.org>
    
    This closes #5051
---
 .../src/main/java/org/apache/nifi/avro/AvroTypeUtil.java   | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git 
a/nifi-nar-bundles/nifi-extension-utils/nifi-record-utils/nifi-avro-record-utils/src/main/java/org/apache/nifi/avro/AvroTypeUtil.java
 
b/nifi-nar-bundles/nifi-extension-utils/nifi-record-utils/nifi-avro-record-utils/src/main/java/org/apache/nifi/avro/AvroTypeUtil.java
index 024f1b5..3eb26e3 100644
--- 
a/nifi-nar-bundles/nifi-extension-utils/nifi-record-utils/nifi-avro-record-utils/src/main/java/org/apache/nifi/avro/AvroTypeUtil.java
+++ 
b/nifi-nar-bundles/nifi-extension-utils/nifi-record-utils/nifi-avro-record-utils/src/main/java/org/apache/nifi/avro/AvroTypeUtil.java
@@ -76,7 +76,6 @@ import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Function;
-import java.util.stream.Collectors;
 
 public class AvroTypeUtil {
     private static final Logger logger = 
LoggerFactory.getLogger(AvroTypeUtil.class);
@@ -900,10 +899,19 @@ public class AvroTypeUtil {
     private static Object convertUnionFieldValue(final Object originalValue, 
final Schema fieldSchema, final Function<Schema, Object> conversion, final 
String fieldName) {
         boolean foundNonNull = false;
 
+        // It is an extremely common case to have a UNION type because a field 
can be NULL or some other type. In this situation,
+        // we will have two possible types, and one of them will be null. When 
this happens, we can be much more efficient by simply
+        // determining the non-null type and converting to that.
+        final List<Schema> schemaTypes = fieldSchema.getTypes();
+        if (schemaTypes.size() == 2 && (schemaTypes.get(0).getType() == 
Type.NULL || schemaTypes.get(1).getType() == Type.NULL)) {
+            final Schema nonNullType = schemaTypes.get(0).getType() == 
Type.NULL ? schemaTypes.get(1) : schemaTypes.get(0);
+            return conversion.apply(nonNullType);
+        }
+
         Optional<Schema> mostSuitableType = DataTypeUtils.findMostSuitableType(
                 originalValue,
-                fieldSchema.getTypes().stream().filter(schema -> 
schema.getType() != Type.NULL).collect(Collectors.toList()),
-                subSchema -> AvroTypeUtil.determineDataType(subSchema)
+                getNonNullSubSchemas(fieldSchema),
+                AvroTypeUtil::determineDataType
         );
         if (mostSuitableType.isPresent()) {
             return conversion.apply(mostSuitableType.get());