anishshri-db commented on code in PR #54083:
URL: https://github.com/apache/spark/pull/54083#discussion_r2772639005
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sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/RocksDB.scala:
##########
@@ -127,7 +127,18 @@ class RocksDB(
rocksDbOptions.setMaxOpenFiles(conf.maxOpenFiles)
rocksDbOptions.setAllowFAllocate(conf.allowFAllocate)
rocksDbOptions.setAvoidFlushDuringShutdown(true)
- rocksDbOptions.setMergeOperator(new StringAppendOperator())
+ // Set merge operator based on version for backward compatibility
+ // Version 1: comma delimiter ",", Version 2: empty string ""
+ val mergeDelimiter = conf.mergeOperatorVersion match {
+ case 1 => ","
+ case 2 => ""
+ case v => throw new IllegalArgumentException(
+ s"Invalid merge operator version: $v. Supported versions are 1 and 2")
+ }
+ rocksDbOptions.setMergeOperator(new StringAppendOperator(mergeDelimiter))
Review Comment:
No I mean earlier we had this
```
rocksDbOptions.setMergeOperator(new StringAppendOperator())
```
but now we have this
```
rocksDbOptions.setMergeOperator(new StringAppendOperator(mergeDelimiter))
```
Would this be equivalent for the existing format ?
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