danny0405 commented on code in PR #19205:
URL: https://github.com/apache/hudi/pull/19205#discussion_r3662315942
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hudi-client/hudi-client-common/src/main/java/org/apache/hudi/config/HoodieWriteConfig.java:
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@@ -3883,6 +3935,27 @@ private void validate() {
checkArgument(ttlStatsMaxParallelism > 0,
String.format("%s must be positive, but was %d",
HoodieTTLConfig.STATS_MAX_PARALLELISM.key(),
ttlStatsMaxParallelism));
+
+ // hoodie.meta.fields.mode is the source of truth for meta-column
population; the deprecated
+ // populate.meta.fields boolean is consulted only when the mode is
absent. There is therefore
+ // no ambiguous combination to reject here — MetaFieldsMode.resolve
throws on unrecognized
+ // values.
+ MetaFieldsMode metaFieldsMode = writeConfig.getMetaFieldsMode();
+ // Selective meta-field modes are CoW-only in this release. MoR
log-write path does not yet
+ // respect the mode, which would silently produce log records with null
meta columns.
+ boolean isSelective = metaFieldsMode != MetaFieldsMode.ALL &&
metaFieldsMode != MetaFieldsMode.NONE;
Review Comment:
can have a method MetaFieldsMode.isSelective
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