(iotdb) branch master updated: fix: reuse pre-computed ArrayList instance size in AlignedTVList ram cost (#18452)

[jackietien]

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JackieTien97 pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/iotdb.git


The following commit(s) were added to refs/heads/master by this push:
     new e1030c5e00e fix: reuse pre-computed ArrayList instance size in 
AlignedTVList ram cost (#18452)
e1030c5e00e is described below

commit e1030c5e00effe35e1bd338e7d459e876647a08b
Author: shuwenwei <55970239+shuwen...@users.noreply.github.com>
AuthorDate: Wed Aug 12 15:23:38 2026 +0800

    fix: reuse pre-computed ArrayList instance size in AlignedTVList ram cost 
(#18452)
---
 .../java/org/apache/iotdb/db/utils/datastructure/AlignedTVList.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git 
a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/datastructure/AlignedTVList.java
 
b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/datastructure/AlignedTVList.java
index 608c363552c..28ec348a1a8 100644
--- 
a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/datastructure/AlignedTVList.java
+++ 
b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/utils/datastructure/AlignedTVList.java
@@ -20,6 +20,7 @@
 package org.apache.iotdb.db.utils.datastructure;
 
 import org.apache.iotdb.common.rpc.thrift.TSStatus;
+import org.apache.iotdb.commons.queryengine.execution.MemoryEstimationHelper;
 import org.apache.iotdb.commons.schema.table.column.TsTableColumnCategory;
 import org.apache.iotdb.commons.utils.TestOnly;
 import org.apache.iotdb.db.i18n.DataNodeMiscMessages;
@@ -1540,11 +1541,12 @@ public abstract class AlignedTVList extends TVList {
   }
 
   static long listRamCostWithReferences(List<?> list) {
-    return RamUsageEstimator.shallowSizeOf(list) + 
RamUsageEstimator.sizeOfObjectArray(list.size());
+    return MemoryEstimationHelper.ARRAY_LIST_INSTANCE_SIZE
+        + RamUsageEstimator.sizeOfObjectArray(list.size());
   }
 
   static long listRamCostWithoutReferences(List<?> list) {
-    return RamUsageEstimator.shallowSizeOf(list)
+    return MemoryEstimationHelper.ARRAY_LIST_INSTANCE_SIZE
         + (list.isEmpty() ? 0 : RamUsageEstimator.sizeOfObjectArray(0));
   }