ulysses-you commented on code in PR #43259:
URL: https://github.com/apache/spark/pull/43259#discussion_r1354338093
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sql/core/src/main/scala/org/apache/spark/sql/internal/CatalogImpl.scala:
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@@ -760,13 +760,13 @@ class CatalogImpl(sparkSession: SparkSession) extends
Catalog {
}
/**
- * Caches the specified table or view in-memory.
+ * Persist the specified table or view with the default storage level,
Review Comment:
> Before this change, persist surely write data to disk(means persistent) no
matter how many times the user calls.
not exactly, the default storage level of persist is memory and disk, so
it's possible only cache it in memory.
> After this change, persist may not write data to disk if some user change
the default storage level with only_memory.
Do you mean user change the default storage level config but actually he
does not want to change the default storage level. So why does he change the
config ? I'm not sure what are you worried about.
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