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https://issues.apache.org/jira/browse/SPARK-40170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17582935#comment-17582935
]
caican edited comment on SPARK-40170 at 8/22/22 12:13 PM:
----------------------------------------------------------
[~kabhwan]
My program code is very simple，as shown below.
```
val rdd = spark.sql("select triggerId,adMetadata,userData from
iceberg_my_cloud.mydb.myTable where date = 20220801").rdd
println(rdd.count())
```
In addition to string decode, the conversion of Tuple2 to MAP is slow and i
have submitted a patch:https://github.com/apache/spark/pull/37609 to optimize
it but right now I don't have a good way to optimize string decode
was (Author: JIRAUSER280464):
My program code is very simple，As shown below.
```
val rdd = spark.sql("select triggerId,adMetadata,userData from
iceberg_my_cloud.mydb.myTable where date = 20220801").rdd
println(rdd.count())
```
> StringCoding UTF8 decode slowly
> -------------------------------
>
> Key: SPARK-40170
> URL: https://issues.apache.org/jira/browse/SPARK-40170
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.2, 3.2.0, 3.1.3, 3.2.1, 3.3.0, 3.2.2, 3.3.1
> Reporter: caican
> Priority: Major
> Attachments: image-2022-08-22-10-56-54-768.png,
> image-2022-08-22-10-57-11-744.png
>
>
> When `UnsafeRow` is converted to `Row` at
> `org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificSafeProjection.createExternalRow
> `, UTF8String decoding and copyMemory process are very slow.
> Does anyone have any ideas for optimization?
> !image-2022-08-22-10-56-54-768.png!
>
> !image-2022-08-22-10-57-11-744.png!
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