[SPARK-18167][SQL] Add debug code for SQLQuerySuite flakiness when me…

…tastore partition pruning is enabled

## What changes were proposed in this pull request?

org.apache.spark.sql.hive.execution.SQLQuerySuite is flaking when hive partition pruning is enabled.
Based on the stack traces, it seems to be an old issue where Hive fails to cast a numeric partition column ("Invalid character string format for type DECIMAL"). There are two possibilities here: either we are somehow corrupting the partition table to have non-decimal values in that column, or there is a transient issue with Derby.

This PR logs the result of the retry when this exception is encountered, so we can confirm what is going on.

## How was this patch tested?

n/a

cc yhuai

Author: Eric Liang <[email protected]>

Closes #15676 from ericl/spark-18167.

sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveShim.scala

@@ -24,6 +24,7 @@ import java.util.{ArrayList => JArrayList, List => JList, Map => JMap, Set => JS
 import java.util.concurrent.TimeUnit
 
 import scala.collection.JavaConverters._
+import scala.util.Try
 import scala.util.control.NonFatal
 
 import org.apache.hadoop.fs.{FileSystem, Path}
@@ -585,7 +586,19 @@ private[client] class Shim_v0_13 extends Shim_v0_12 {
         getAllPartitionsMethod.invoke(hive, table).asInstanceOf[JSet[Partition]]
       } else {
         logDebug(s"Hive metastore filter is '$filter'.")
-        getPartitionsByFilterMethod.invoke(hive, table, filter).asInstanceOf[JArrayList[Partition]]
+        try {
+          getPartitionsByFilterMethod.invoke(hive, table, filter)
+            .asInstanceOf[JArrayList[Partition]]
+        } catch {
+          case e: InvocationTargetException =>
+            // SPARK-18167 retry to investigate the flaky test. This should be reverted before
+            // the release is cut.
+            val retry = Try(getPartitionsByFilterMethod.invoke(hive, table, filter))
+            val full = Try(getAllPartitionsMethod.invoke(hive, table))
+            logError("getPartitionsByFilter failed, retry success = " + retry.isSuccess)
+            logError("getPartitionsByFilter failed, full fetch success = " + full.isSuccess)
+            throw e
+        }
       }
 
     partitions.asScala.toSeq