rworley-monster commented on a change in pull request #12367:
URL: https://github.com/apache/beam/pull/12367#discussion_r472156800
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File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/utils/AvroUtils.java
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@@ -601,12 +601,26 @@ private void readObject(ObjectInputStream in) throws
IOException, ClassNotFoundE
private Map<String, String> getMapping(Schema schema) {
Map<String, String> mapping = Maps.newHashMap();
for (Field field : schema.getFields()) {
- String underscore =
CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, field.getName());
- mapping.put(underscore, field.getName());
+ String fieldName = field.getName();
+ String getter;
+ if (fieldName.contains("_")) {
+ if (Character.isLowerCase(fieldName.charAt(0))) {
+ // field_name -> fieldName
+ getter = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL,
fieldName);
+ } else {
+ // FIELD_NAME -> fIELDNAME
+ getter = CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_CAMEL,
fieldName.replace("_", ""));
Review comment:
When Avro compiles a schema to a Java class, it will take a field named
`FIELD_NAME` and create a getter named `getFIELDNAME`. So this method needs to
produce getter field name `fIELDNAME`.
After some trial and error, I found I could produce this if I remove the
underscore and convert it from `UPPER_CAMEL`. When I use `UPPER_UNDERSCORE`
(with or without the underscore in the field name), it produces a getter field
name of `fieldName` or `fieldname`, which won't map to the `getFIELDNAME`
method.
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