KurtYoung commented on a change in pull request #10196: [FLINK-14789]
[table-planner-blink] extends max/min type in ColumnStats from Number to
Comparable
URL: https://github.com/apache/flink/pull/10196#discussion_r346838659
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/plan/stats/ColumnStats.java
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@@ -50,28 +50,72 @@
private final Integer maxLen;
/**
- * max value of column values.
+ * Deprecated because not well supported comparable type,
+ * e.g. {@link java.util.Date}, {@link java.sql.Timestamp}.
*/
- private final Number max;
+ @Deprecated
+ private final Number maxValue;
/**
- * min value of column values.
+ * max value of column values, null if the value is not comparable.
Review comment:
`null if the value is not comparable`?
I thought null means we don't have such information.
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