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https://issues.apache.org/jira/browse/HIVE-20321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578841#comment-16578841
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Gopal V commented on HIVE-20321:
--------------------------------
And query51 has "group by ss_item_sk, d_date"
> Vectorization: Cut down memory size of 1 col VectorHashKeyWrapper to <1
> CacheLine
> ---------------------------------------------------------------------------------
>
> Key: HIVE-20321
> URL: https://issues.apache.org/jira/browse/HIVE-20321
> Project: Hive
> Issue Type: Bug
> Reporter: Gopal V
> Priority: Major
>
> With a full sized LLAP instance, the memory size of the VectorHashKeyWrapper
> is bigger than the low Xmx JVMs.
> {code}
> ***** 64-bit VM: **********************************************************
> org.apache.hadoop.hive.ql.exec.vector.VectorHashKeyWrapper object internals:
> OFFSET SIZE
> TYPE DESCRIPTION VALUE
> 0 16
> (object header) N/A
> 16 4
> int VectorHashKeyWrapper.hashcode N/A
> 20 4
> (alignment/padding gap)
> 24 8
> long[] VectorHashKeyWrapper.longValues N/A
> 32 8
> double[] VectorHashKeyWrapper.doubleValues N/A
> 40 8
> byte[][] VectorHashKeyWrapper.byteValues N/A
> 48 8
> int[] VectorHashKeyWrapper.byteStarts N/A
> 56 8
> int[] VectorHashKeyWrapper.byteLengths N/A
> 64 8
> org.apache.hadoop.hive.serde2.io.HiveDecimalWritable[]
> VectorHashKeyWrapper.decimalValues N/A
> 72 8
> java.sql.Timestamp[] VectorHashKeyWrapper.timestampValues N/A
> 80 8
> org.apache.hadoop.hive.common.type.HiveIntervalDayTime[]
> VectorHashKeyWrapper.intervalDayTimeValues N/A
> 88 8
> boolean[] VectorHashKeyWrapper.isNull N/A
> 96 8
> org.apache.hadoop.hive.ql.exec.vector.VectorHashKeyWrapper.HashContext
> VectorHashKeyWrapper.hashCtx N/A
> Instance size: 104 bytes
> Space losses: 4 bytes internal + 0 bytes external = 4 bytes total
> {code}
> Pulling this up to a parent class allows for this to be cut down to 32 bytes
> for the single column case.
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