Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/13156#discussion_r63758414
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SessionState.scala ---
@@ -163,6 +163,9 @@ private[sql] class SessionState(sparkSession:
SparkSession) {
def executePlan(plan: LogicalPlan): QueryExecution = new
QueryExecution(sparkSession, plan)
def refreshTable(tableName: String): Unit = {
+ // Different from SparkSession.catalog.refreshTable, this API only
refreshes the metadata.
+ // It does not reload the cached data. That means, if this table is
cached as
+ // an InMemoryRelation, we do not refresh the cached data.
--- End diff --
`SharedState` can refresh the cached table data. In `SessionState`, we only
can refresh the metadata. Thus, this API `refreshTable` only refresh the
metadata
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