MaxGekk commented on code in PR #41580:
URL: https://github.com/apache/spark/pull/41580#discussion_r1245579209
##########
connector/connect/server/src/main/scala/org/apache/spark/sql/connect/service/SessionHolder.scala:
##########
@@ -163,6 +169,31 @@ case class SessionHolder(userId: String, sessionId:
String, session: SparkSessio
}
}
}
+
+ /**
+ * Caches given DataFrame with the ID. The cache does not expire. The entry
needs to be
+ * explicitly removed by the owners of the DataFrame once it is not needed.
+ */
+ private[connect] def cacheDataFrameById(dfId: String, df: DataFrame): Unit =
{
+ if (dataFrameCache.putIfAbsent(dfId, df) != null) {
+ throw new IllegalArgumentException(s"A dataframe is already associated
with id $dfId")
Review Comment:
So far, we are migrating on the error class, and converted 72 cases already:
```
$ find . -name "*.scala" -print0|xargs -0 grep
'SparkException.internalError'|wc -l
72
```
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