[SPARK-15698][SQL][STREAMING][FOLLW-UP] Fix FileStream source and sink log get configuration issue

## What changes were proposed in this pull request?

This issue was introduced in the previous commit of SPARK-15698. Mistakenly change the way to get configuration back to original one, so here with the follow up PR to revert them up.

## How was this patch tested?

N/A

Ping zsxwing , please review again, sorry to bring the inconvenience. Thanks a lot.

Author: jerryshao <sshao@hortonworks.com>

Closes #15173 from jerryshao/SPARK-15698-follow.

sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FileStreamSinkLog.scala

@@ -84,14 +84,11 @@ class FileStreamSinkLog(
 
   private implicit val formats = Serialization.formats(NoTypeHints)
 
-  protected override val fileCleanupDelayMs =
-    sparkSession.conf.get(SQLConf.FILE_SINK_LOG_CLEANUP_DELAY)
+  protected override val fileCleanupDelayMs = sparkSession.sessionState.conf.fileSinkLogCleanupDelay
 
-  protected override val isDeletingExpiredLog =
-    sparkSession.conf.get(SQLConf.FILE_SINK_LOG_DELETION)
+  protected override val isDeletingExpiredLog = sparkSession.sessionState.conf.fileSinkLogDeletion
 
-  protected override val compactInterval =
-    sparkSession.conf.get(SQLConf.FILE_SINK_LOG_COMPACT_INTERVAL)
+  protected override val compactInterval = sparkSession.sessionState.conf.fileSinkLogCompactInterval
   require(compactInterval > 0,
     s"Please set ${SQLConf.FILE_SINK_LOG_COMPACT_INTERVAL.key} (was $compactInterval) " +
       "to a positive value.")

sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FileStreamSourceLog.scala

@@ -39,16 +39,15 @@ class FileStreamSourceLog(
 
   // Configurations about metadata compaction
   protected override val compactInterval =
-  sparkSession.conf.get(SQLConf.FILE_SOURCE_LOG_COMPACT_INTERVAL)
+    sparkSession.sessionState.conf.fileSourceLogCompactInterval
   require(compactInterval > 0,
     s"Please set ${SQLConf.FILE_SOURCE_LOG_COMPACT_INTERVAL.key} (was $compactInterval) to a " +
       s"positive value.")
 
   protected override val fileCleanupDelayMs =
-    sparkSession.conf.get(SQLConf.FILE_SOURCE_LOG_CLEANUP_DELAY)
+    sparkSession.sessionState.conf.fileSourceLogCleanupDelay
 
-  protected override val isDeletingExpiredLog =
-    sparkSession.conf.get(SQLConf.FILE_SOURCE_LOG_DELETION)
+  protected override val isDeletingExpiredLog = sparkSession.sessionState.conf.fileSourceLogDeletion
 
   private implicit val formats = Serialization.formats(NoTypeHints)
 

sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala

@@ -620,10 +620,16 @@ private[sql] class SQLConf extends Serializable with CatalystConf with Logging {
 
   def fileSinkLogDeletion: Boolean = getConf(FILE_SINK_LOG_DELETION)
 
-  def fileSinkLogCompatInterval: Int = getConf(FILE_SINK_LOG_COMPACT_INTERVAL)
+  def fileSinkLogCompactInterval: Int = getConf(FILE_SINK_LOG_COMPACT_INTERVAL)
 
   def fileSinkLogCleanupDelay: Long = getConf(FILE_SINK_LOG_CLEANUP_DELAY)
 
+  def fileSourceLogDeletion: Boolean = getConf(FILE_SOURCE_LOG_DELETION)
+
+  def fileSourceLogCompactInterval: Int = getConf(FILE_SOURCE_LOG_COMPACT_INTERVAL)
+
+  def fileSourceLogCleanupDelay: Long = getConf(FILE_SOURCE_LOG_CLEANUP_DELAY)
+
   def streamingSchemaInference: Boolean = getConf(STREAMING_SCHEMA_INFERENCE)
 
   def streamingPollingDelay: Long = getConf(STREAMING_POLLING_DELAY)