clintropolis commented on code in PR #14319:
URL: https://github.com/apache/druid/pull/14319#discussion_r1203512991
##########
sql/src/main/java/org/apache/druid/sql/calcite/schema/SegmentMetadataCache.java:
##########
@@ -995,4 +986,126 @@ void doInLock(Runnable runnable)
runnable.run();
}
}
+
+
+ /**
+ * ColumnTypeMergePolicy defines the rules of which type to use when faced
with the possibility of different types
+ * for the same column from segment to segment. It is used to help compute a
{@link RowSignature} for a table in
+ * Druid based on the segment metadata of all segments, merging the types of
each column encountered to end up with
+ * a single type to represent it globally.
+ */
+ @FunctionalInterface
+ public interface ColumnTypeMergePolicy
+ {
+ ColumnType merge(ColumnType existingType, ColumnType newType);
+
+ @JsonCreator
+ static ColumnTypeMergePolicy fromString(String type)
+ {
+ if (LeastRestrictiveTypeMergePolicy.NAME.equals(type)) {
Review Comment:
done
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