Kikyou1997 commented on code in PR #19205:
URL: https://github.com/apache/doris/pull/19205#discussion_r1186649242
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fe/fe-common/src/main/java/org/apache/doris/common/Config.java:
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@@ -1919,5 +1919,20 @@ public class Config extends ConfigBase {
@ConfField(mutable = true)
public static boolean disable_datev1 = true;
+
+ /**
+ * The actual memory size taken by stats cache highly depends on
characteristics of data, since on the different
+ * dataset and scenarios the max/min literal's average size and buckets
count of histogram would be highly
+ * different. Besides, JVM version etc. also has influence on it, though
not much as data itself.
+ * Here I would give the mem size taken by stats cache with 10_0000
items.Each item's avg length of max/min literal
+ * is 32, and the avg column name length is 16, and each column has a
histogram with 128 buckets
+ * In this case, stats cache takes total 911.954833984MiB mem.
+ * If without histogram, stats cache takes total 61.2777404785MiB mem.
+ * It's strongly discourage analyzing a column with a very large STRING
value in the column, since it would cause
+ * FE OOM.
+ */
+ @ConfField
+ public static long stats_cache_size = 10_0000;
Review Comment:
Once the cache size is determined it can't be changed during the FE process
lifetime
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