danny0405 commented on code in PR #20346:
URL: https://github.com/apache/hudi/pull/20346#discussion_r4300817866
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hudi-common/src/main/java/org/apache/hudi/common/table/HoodieTableConfig.java:
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@@ -701,6 +701,17 @@ public static void create(HoodieStorage storage,
StoragePath metadataFolder, Pro
hoodieConfig.setValue(POPULATE_META_FIELDS,
Boolean.toString(metaFieldsMode.toLegacyPopulateMetaFields()));
}
+ List<String> orderingFields =
StringUtils.split(hoodieConfig.getProps().getProperty(ORDERING_FIELDS.key()),
",");
+ if (!orderingFields.isEmpty() &&
tableVersion.lesserThan(HoodieTableVersion.NINE)) {
+ // readers of tables below version 9 only know the deprecated
precombine key, which the 9 to 8 downgrade writes too,
+ // and take its value as one field name
+ if
(MySqlDebeziumAvroPayload.class.getName().equals(hoodieConfig.getString(PAYLOAD_CLASS_NAME)))
{
+ // below version 9 this payload orders on its sequence field, the
value the downgrade writes for it
+ hoodieConfig.setValue(PRECOMBINE_FIELD,
DebeziumConstants.ADDED_SEQ_COL_NAME);
Review Comment:
So the user just not declare the ordering field?
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