diff --git a/src/backend/distributed/commands/multi_copy.c b/src/backend/distributed/commands/multi_copy.c
index 8887513cc..ee8cd5700 100644
--- a/src/backend/distributed/commands/multi_copy.c
+++ b/src/backend/distributed/commands/multi_copy.c
@@ -2609,6 +2609,7 @@ ProcessCopyStmt(CopyStmt *copyStatement, char *completionTag, const char *queryS
 			Query *query = NULL;
 			Node *queryNode = copyStatement->query;
 			List *queryTreeList = NIL;
+			StringInfo userFilePath = makeStringInfo();
 
 #if (PG_VERSION_NUM >= 100000)
 			RawStmt *rawStmt = makeNode(RawStmt);
@@ -2625,6 +2626,14 @@ ProcessCopyStmt(CopyStmt *copyStatement, char *completionTag, const char *queryS
 			}
 
 			query = (Query *) linitial(queryTreeList);
+
+			/*
+			 * Add a user ID suffix to prevent other users from reading/writing
+			 * the same file. We do this consistently in all functions that interact
+			 * with task files.
+			 */
+			appendStringInfo(userFilePath, "%s.%u", filename, GetUserId());
+
 			tuplesSent = WorkerExecuteSqlTask(query, filename, binaryCopyFormat);
 
 			snprintf(completionTag, COMPLETION_TAG_BUFSIZE,
diff --git a/src/backend/distributed/commands/transmit.c b/src/backend/distributed/commands/transmit.c
index 95c90bba9..fa976661c 100644
--- a/src/backend/distributed/commands/transmit.c
+++ b/src/backend/distributed/commands/transmit.c
@@ -359,6 +359,32 @@ IsTransmitStmt(Node *parsetree)
 }
 
 
+/*
+ * TransmitStatementUser extracts the user attribute from a
+ * COPY ... (format 'transmit', user '...') statement.
+ */
+char *
+TransmitStatementUser(CopyStmt *copyStatement)
+{
+	ListCell *optionCell = NULL;
+	char *userName = NULL;
+
+	AssertArg(IsTransmitStmt((Node *) copyStatement));
+
+	foreach(optionCell, copyStatement->options)
+	{
+		DefElem *defel = (DefElem *) lfirst(optionCell);
+
+		if (strncmp(defel->defname, "user", NAMEDATALEN) == 0)
+		{
+			userName = defGetString(defel);
+		}
+	}
+
+	return userName;
+}
+
+
 /*
  * VerifyTransmitStmt checks that the passed in command is a valid transmit
  * statement. Raise ERROR if not.
diff --git a/src/backend/distributed/commands/utility_hook.c b/src/backend/distributed/commands/utility_hook.c
index b247e4952..f7699a94e 100644
--- a/src/backend/distributed/commands/utility_hook.c
+++ b/src/backend/distributed/commands/utility_hook.c
@@ -222,17 +222,28 @@ multi_ProcessUtility(PlannedStmt *pstmt,
 	if (IsTransmitStmt(parsetree))
 	{
 		CopyStmt *copyStatement = (CopyStmt *) parsetree;
+		char *userName = TransmitStatementUser(copyStatement);
+		bool missingOK = false;
+		StringInfo transmitPath = makeStringInfo();
 
 		VerifyTransmitStmt(copyStatement);
 
 		/* ->relation->relname is the target file in our overloaded COPY */
+		appendStringInfoString(transmitPath, copyStatement->relation->relname);
+
+		if (userName != NULL)
+		{
+			Oid userId = get_role_oid(userName, missingOK);
+			appendStringInfo(transmitPath, ".%d", userId);
+		}
+
 		if (copyStatement->is_from)
 		{
-			RedirectCopyDataToRegularFile(copyStatement->relation->relname);
+			RedirectCopyDataToRegularFile(transmitPath->data);
 		}
 		else
 		{
-			SendRegularFile(copyStatement->relation->relname);
+			SendRegularFile(transmitPath->data);
 		}
 
 		/* Don't execute the faux copy statement */
diff --git a/src/backend/distributed/executor/multi_task_tracker_executor.c b/src/backend/distributed/executor/multi_task_tracker_executor.c
index 724359b57..ae4dcd682 100644
--- a/src/backend/distributed/executor/multi_task_tracker_executor.c
+++ b/src/backend/distributed/executor/multi_task_tracker_executor.c
@@ -2590,9 +2590,11 @@ ManageTransmitTracker(TaskTracker *transmitTracker)
 		int32 connectionId = transmitTracker->connectionId;
 		StringInfo jobDirectoryName = JobDirectoryName(transmitState->jobId);
 		StringInfo taskFilename = TaskFilename(jobDirectoryName, transmitState->taskId);
+		char *userName = CurrentUserName();
 
 		StringInfo fileTransmitQuery = makeStringInfo();
-		appendStringInfo(fileTransmitQuery, TRANSMIT_REGULAR_COMMAND, taskFilename->data);
+		appendStringInfo(fileTransmitQuery, TRANSMIT_WITH_USER_COMMAND,
+						 taskFilename->data, quote_literal_cstr(userName));
 
 		fileTransmitStarted = MultiClientSendQuery(connectionId, fileTransmitQuery->data);
 		if (fileTransmitStarted)
diff --git a/src/backend/distributed/worker/worker_data_fetch_protocol.c b/src/backend/distributed/worker/worker_data_fetch_protocol.c
index b90e19f9c..d0533158a 100644
--- a/src/backend/distributed/worker/worker_data_fetch_protocol.c
+++ b/src/backend/distributed/worker/worker_data_fetch_protocol.c
@@ -108,7 +108,7 @@ worker_fetch_partition_file(PG_FUNCTION_ARGS)
 
 	/* local filename is <jobId>/<upstreamTaskId>/<partitionTaskId> */
 	StringInfo taskDirectoryName = TaskDirectoryName(jobId, upstreamTaskId);
-	StringInfo taskFilename = TaskFilename(taskDirectoryName, partitionTaskId);
+	StringInfo taskFilename = UserTaskFilename(taskDirectoryName, partitionTaskId);
 
 	/*
 	 * If we are the first function to fetch a file for the upstream task, the
@@ -154,7 +154,7 @@ worker_fetch_query_results_file(PG_FUNCTION_ARGS)
 
 	/* local filename is <jobId>/<upstreamTaskId>/<queryTaskId> */
 	StringInfo taskDirectoryName = TaskDirectoryName(jobId, upstreamTaskId);
-	StringInfo taskFilename = TaskFilename(taskDirectoryName, queryTaskId);
+	StringInfo taskFilename = UserTaskFilename(taskDirectoryName, queryTaskId);
 
 	/*
 	 * If we are the first function to fetch a file for the upstream task, the
@@ -191,6 +191,21 @@ TaskFilename(StringInfo directoryName, uint32 taskId)
 }
 
 
+/*
+ * UserTaskFilename returns a full file path for a task file including the
+ * current user ID as a suffix.
+ */
+StringInfo
+UserTaskFilename(StringInfo directoryName, uint32 taskId)
+{
+	StringInfo taskFilename = TaskFilename(directoryName, taskId);
+
+	appendStringInfo(taskFilename, ".%u", GetUserId());
+
+	return taskFilename;
+}
+
+
 /*
  * FetchRegularFileAsSuperUser copies a file from a remote node in an idempotent
  * manner. It connects to the remote node as superuser to give file access.
@@ -203,6 +218,7 @@ FetchRegularFileAsSuperUser(const char *nodeName, uint32 nodePort,
 	char *nodeUser = NULL;
 	StringInfo attemptFilename = NULL;
 	StringInfo transmitCommand = NULL;
+	char *userName = CurrentUserName();
 	uint32 randomId = (uint32) random();
 	bool received = false;
 	int renamed = 0;
@@ -217,7 +233,8 @@ FetchRegularFileAsSuperUser(const char *nodeName, uint32 nodePort,
 					 MIN_TASK_FILENAME_WIDTH, randomId, ATTEMPT_FILE_SUFFIX);
 
 	transmitCommand = makeStringInfo();
-	appendStringInfo(transmitCommand, TRANSMIT_REGULAR_COMMAND, remoteFilename->data);
+	appendStringInfo(transmitCommand, TRANSMIT_WITH_USER_COMMAND, remoteFilename->data,
+					 quote_literal_cstr(userName));
 
 	/* connect as superuser to give file access */
 	nodeUser = CitusExtensionOwnerName();
diff --git a/src/backend/distributed/worker/worker_merge_protocol.c b/src/backend/distributed/worker/worker_merge_protocol.c
index f95d19d16..74331f984 100644
--- a/src/backend/distributed/worker/worker_merge_protocol.c
+++ b/src/backend/distributed/worker/worker_merge_protocol.c
@@ -23,6 +23,7 @@
 #include "catalog/pg_namespace.h"
 #include "commands/copy.h"
 #include "commands/tablecmds.h"
+#include "common/string.h"
 #include "distributed/metadata_cache.h"
 #include "distributed/worker_protocol.h"
 #include "distributed/version_compat.h"
@@ -42,7 +43,7 @@ static List * ArrayObjectToCStringList(ArrayType *arrayObject);
 static void CreateTaskTable(StringInfo schemaName, StringInfo relationName,
 							List *columnNameList, List *columnTypeList);
 static void CopyTaskFilesFromDirectory(StringInfo schemaName, StringInfo relationName,
-									   StringInfo sourceDirectoryName);
+									   StringInfo sourceDirectoryName, Oid userId);
 
 
 /* exports for SQL callable functions */
@@ -78,6 +79,7 @@ worker_merge_files_into_table(PG_FUNCTION_ARGS)
 	List *columnTypeList = NIL;
 	Oid savedUserId = InvalidOid;
 	int savedSecurityContext = 0;
+	Oid userId = GetUserId();
 
 	/* we should have the same number of column names and types */
 	int32 columnNameCount = ArrayObjectCount(columnNameObject);
@@ -112,7 +114,8 @@ worker_merge_files_into_table(PG_FUNCTION_ARGS)
 	GetUserIdAndSecContext(&savedUserId, &savedSecurityContext);
 	SetUserIdAndSecContext(CitusExtensionOwner(), SECURITY_LOCAL_USERID_CHANGE);
 
-	CopyTaskFilesFromDirectory(jobSchemaName, taskTableName, taskDirectoryName);
+	CopyTaskFilesFromDirectory(jobSchemaName, taskTableName, taskDirectoryName,
+							   userId);
 
 	SetUserIdAndSecContext(savedUserId, savedSecurityContext);
 
@@ -155,6 +158,7 @@ worker_merge_files_and_run_query(PG_FUNCTION_ARGS)
 	int createMergeTableResult = 0;
 	int createIntermediateTableResult = 0;
 	int finished = 0;
+	Oid userId = GetUserId();
 
 	CheckCitusVersion(ERROR);
 
@@ -196,7 +200,8 @@ worker_merge_files_and_run_query(PG_FUNCTION_ARGS)
 
 	appendStringInfo(mergeTableName, "%s%s", intermediateTableName->data,
 					 MERGE_TABLE_SUFFIX);
-	CopyTaskFilesFromDirectory(jobSchemaName, mergeTableName, taskDirectoryName);
+	CopyTaskFilesFromDirectory(jobSchemaName, mergeTableName, taskDirectoryName,
+							   userId);
 
 	createIntermediateTableResult = SPI_exec(createIntermediateTableQuery, 0);
 	if (createIntermediateTableResult < 0)
@@ -482,14 +487,20 @@ CreateStatement(RangeVar *relation, List *columnDefinitionList)
  * CopyTaskFilesFromDirectory finds all files in the given directory, except for
  * those having an attempt suffix. The function then copies these files into the
  * database table identified by the given schema and table name.
+ *
+ * The function makes sure all files were generated by the current user by checking
+ * whether the filename ends with the username, since this is added to local file
+ * names by functions such as worker_fetch_partition-file. Files that were generated
+ * by other users calling worker_fetch_partition_file directly are skipped.
  */
 static void
 CopyTaskFilesFromDirectory(StringInfo schemaName, StringInfo relationName,
-						   StringInfo sourceDirectoryName)
+						   StringInfo sourceDirectoryName, Oid userId)
 {
 	const char *directoryName = sourceDirectoryName->data;
 	struct dirent *directoryEntry = NULL;
 	uint64 copiedRowTotal = 0;
+	StringInfo expectedFileSuffix = makeStringInfo();
 
 	DIR *directory = AllocateDir(directoryName);
 	if (directory == NULL)
@@ -498,6 +509,8 @@ CopyTaskFilesFromDirectory(StringInfo schemaName, StringInfo relationName,
 						errmsg("could not open directory \"%s\": %m", directoryName)));
 	}
 
+	appendStringInfo(expectedFileSuffix, ".%u", userId);
+
 	directoryEntry = ReadDir(directory, directoryName);
 	for (; directoryEntry != NULL; directoryEntry = ReadDir(directory, directoryName))
 	{
@@ -516,6 +529,18 @@ CopyTaskFilesFromDirectory(StringInfo schemaName, StringInfo relationName,
 			continue;
 		}
 
+		if (!pg_str_endswith(baseFilename, expectedFileSuffix->data))
+		{
+			/*
+			 * Someone is trying to tamper with our results. We don't throw an error
+			 * here because we don't want to allow users to prevent each other from
+			 * running queries.
+			 */
+			ereport(WARNING, (errmsg("Task file \"%s\" does not have expected suffix "
+									 "\"%s\"", baseFilename, expectedFileSuffix->data)));
+			continue;
+		}
+
 		fullFilename = makeStringInfo();
 		appendStringInfo(fullFilename, "%s/%s", directoryName, baseFilename);
 
diff --git a/src/backend/distributed/worker/worker_partition_protocol.c b/src/backend/distributed/worker/worker_partition_protocol.c
index 386e7fd28..d5ca9b44f 100644
--- a/src/backend/distributed/worker/worker_partition_protocol.c
+++ b/src/backend/distributed/worker/worker_partition_protocol.c
@@ -16,6 +16,7 @@
 
 #include "postgres.h"
 #include "funcapi.h"
+#include "miscadmin.h"
 #include "pgstat.h"
 
 #include <arpa/inet.h>
@@ -80,6 +81,7 @@ static void OutputBinaryFooters(FileOutputStream *partitionFileArray, uint32 fil
 static uint32 RangePartitionId(Datum partitionValue, const void *context);
 static uint32 HashPartitionId(Datum partitionValue, const void *context);
 static uint32 HashPartitionIdViaDeprecatedAPI(Datum partitionValue, const void *context);
+static StringInfo UserPartitionFilename(StringInfo directoryName, uint32 partitionId);
 static bool FileIsLink(char *filename, struct stat filestat);
 
 
@@ -509,7 +511,7 @@ OpenPartitionFiles(StringInfo directoryName, uint32 fileCount)
 
 	for (fileIndex = 0; fileIndex < fileCount; fileIndex++)
 	{
-		StringInfo filePath = PartitionFilename(directoryName, fileIndex);
+		StringInfo filePath = UserPartitionFilename(directoryName, fileIndex);
 
 		fileDescriptor = PathNameOpenFilePerm(filePath->data, fileFlags, fileMode);
 		if (fileDescriptor < 0)
@@ -606,7 +608,14 @@ TaskDirectoryName(uint64 jobId, uint32 taskId)
 }
 
 
-/* Constructs a standardized partition file path for given directory and id. */
+/*
+ * PartitionFilename returns a partition file path for given directory and id
+ * which is suitable for use in worker_fetch_partition_file and tranmsit.
+ *
+ * It excludes the user ID part at the end of the filename, since that is
+ * added by worker_fetch_partition_file itself based on the current user.
+ * For the full path use UserPartitionFilename.
+ */
 StringInfo
 PartitionFilename(StringInfo directoryName, uint32 partitionId)
 {
@@ -619,6 +628,21 @@ PartitionFilename(StringInfo directoryName, uint32 partitionId)
 }
 
 
+/*
+ * UserPartitionFilename returns the path of a partition file for the given
+ * partition ID and the current user.
+ */
+static StringInfo
+UserPartitionFilename(StringInfo directoryName, uint32 partitionId)
+{
+	StringInfo partitionFilename = PartitionFilename(directoryName, partitionId);
+
+	appendStringInfo(partitionFilename, ".%u", GetUserId());
+
+	return partitionFilename;
+}
+
+
 /*
  * JobDirectoryElement takes in a filename, and checks if this name lives in the
  * directory path that is used for task output files. Note that this function's
diff --git a/src/backend/distributed/worker/worker_sql_task_protocol.c b/src/backend/distributed/worker/worker_sql_task_protocol.c
index 1648a0c2c..c9246038c 100644
--- a/src/backend/distributed/worker/worker_sql_task_protocol.c
+++ b/src/backend/distributed/worker/worker_sql_task_protocol.c
@@ -82,7 +82,7 @@ worker_execute_sql_task(PG_FUNCTION_ARGS)
 
 	/* job directory is created prior to scheduling the task */
 	StringInfo jobDirectoryName = JobDirectoryName(jobId);
-	StringInfo taskFilename = TaskFilename(jobDirectoryName, taskId);
+	StringInfo taskFilename = UserTaskFilename(jobDirectoryName, taskId);
 
 	query = ParseQueryString(queryString);
 	tuplesSent = WorkerExecuteSqlTask(query, taskFilename->data, binaryCopyFormat);
diff --git a/src/include/distributed/transmit.h b/src/include/distributed/transmit.h
index 28ed0dad3..5aadafec6 100644
--- a/src/include/distributed/transmit.h
+++ b/src/include/distributed/transmit.h
@@ -28,6 +28,7 @@ extern void FreeStringInfo(StringInfo stringInfo);
 
 /* Local functions forward declarations for Transmit statement */
 extern bool IsTransmitStmt(Node *parsetree);
+extern char * TransmitStatementUser(CopyStmt *copyStatement);
 extern void VerifyTransmitStmt(CopyStmt *copyStatement);
 
 
diff --git a/src/include/distributed/worker_protocol.h b/src/include/distributed/worker_protocol.h
index b92119b7f..5dca935cb 100644
--- a/src/include/distributed/worker_protocol.h
+++ b/src/include/distributed/worker_protocol.h
@@ -44,7 +44,8 @@
 
 /* Defines used for fetching files and tables */
 /* the tablename in the overloaded COPY statement is the to-be-transferred file */
-#define TRANSMIT_REGULAR_COMMAND "COPY \"%s\" TO STDOUT WITH (format 'transmit')"
+#define TRANSMIT_WITH_USER_COMMAND \
+	"COPY \"%s\" TO STDOUT WITH (format 'transmit', user %s)"
 #define COPY_OUT_COMMAND "COPY %s TO STDOUT"
 #define COPY_SELECT_ALL_OUT_COMMAND "COPY (SELECT * FROM %s) TO STDOUT"
 #define COPY_IN_COMMAND "COPY %s FROM '%s'"
@@ -128,6 +129,7 @@ extern int64 WorkerExecuteSqlTask(Query *query, char *taskFilename,
 
 /* Function declarations shared with the master planner */
 extern StringInfo TaskFilename(StringInfo directoryName, uint32 taskId);
+extern StringInfo UserTaskFilename(StringInfo directoryName, uint32 taskId);
 extern List * ExecuteRemoteQuery(const char *nodeName, uint32 nodePort, char *runAsUser,
 								 StringInfo queryString);
 extern List * ColumnDefinitionList(List *columnNameList, List *columnTypeList);
diff --git a/src/test/regress/expected/task_tracker_partition_task.out b/src/test/regress/expected/task_tracker_partition_task.out
index 2d36f93b0..6d30e3d48 100644
--- a/src/test/regress/expected/task_tracker_partition_task.out
+++ b/src/test/regress/expected/task_tracker_partition_task.out
@@ -8,6 +8,11 @@
 \set TablePart00 lineitem_partition_task_part_00
 \set TablePart01 lineitem_partition_task_part_01
 \set TablePart02 lineitem_partition_task_part_02
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:PartitionTaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:PartitionTaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:PartitionTaskId/p_00002.:userid
 -- We assign a partition task and wait for it to complete. Note that we hardcode
 -- the partition function call string, including the job and task identifiers,
 -- into the argument in the task assignment function. This hardcoding is
@@ -34,9 +39,9 @@ SELECT task_tracker_task_status(:JobId, :PartitionTaskId);
                         6
 (1 row)
 
-COPY :TablePart00 FROM 'base/pgsql_job_cache/job_401010/task_801106/p_00000';
-COPY :TablePart01 FROM 'base/pgsql_job_cache/job_401010/task_801106/p_00001';
-COPY :TablePart02 FROM 'base/pgsql_job_cache/job_401010/task_801106/p_00002';
+COPY :TablePart00 FROM :'Table_File_00';
+COPY :TablePart01 FROM :'Table_File_01';
+COPY :TablePart02 FROM :'Table_File_02';
 SELECT COUNT(*) FROM :TablePart00;
  count 
 -------
diff --git a/src/test/regress/expected/worker_binary_data_partition.out b/src/test/regress/expected/worker_binary_data_partition.out
index afab11021..b07d7d66e 100644
--- a/src/test/regress/expected/worker_binary_data_partition.out
+++ b/src/test/regress/expected/worker_binary_data_partition.out
@@ -12,6 +12,11 @@
 \set Table_Part_00 binary_data_table_part_00
 \set Table_Part_01 binary_data_table_part_01
 \set Table_Part_02 binary_data_table_part_02
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
 -- Create table with special characters
 CREATE TABLE :Table_Name(textcolumn text, binarycolumn bytea);
 COPY :Table_Name FROM stdin;
@@ -47,9 +52,9 @@ SELECT worker_range_partition_table(:JobId, :TaskId, :Select_Query_Text,
 CREATE TABLE :Table_Part_00 ( LIKE :Table_Name );
 CREATE TABLE :Table_Part_01 ( LIKE :Table_Name );
 CREATE TABLE :Table_Part_02 ( LIKE :Table_Name );
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101105/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101105/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101105/p_00002';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
 -- The union of the three partitions should have as many rows as original table
 SELECT COUNT(*) AS total_row_count FROM (
        SELECT * FROM :Table_Part_00 UNION ALL
diff --git a/src/test/regress/expected/worker_hash_partition.out b/src/test/regress/expected/worker_hash_partition.out
index 63ed5f27d..c21c943d4 100644
--- a/src/test/regress/expected/worker_hash_partition.out
+++ b/src/test/regress/expected/worker_hash_partition.out
@@ -16,6 +16,12 @@
 \set Table_Part_01 lineitem_hash_part_01
 \set Table_Part_02 lineitem_hash_part_02
 \set Table_Part_03 lineitem_hash_part_03
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
 -- Run select query, and apply hash partitioning on query results
 SELECT worker_hash_partition_table(:JobId, :TaskId, :Select_Query_Text,
        				   :Partition_Column_Text, :Partition_Column_Type::regtype,
@@ -25,10 +31,10 @@ SELECT worker_hash_partition_table(:JobId, :TaskId, :Select_Query_Text,
  
 (1 row)
 
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00002';
-COPY :Table_Part_03 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00003';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
+COPY :Table_Part_03 FROM :'Table_File_03';
 SELECT COUNT(*) FROM :Table_Part_00;
  count 
 -------
diff --git a/src/test/regress/expected/worker_hash_partition_complex.out b/src/test/regress/expected/worker_hash_partition_complex.out
index a90f4d505..4931d0032 100644
--- a/src/test/regress/expected/worker_hash_partition_complex.out
+++ b/src/test/regress/expected/worker_hash_partition_complex.out
@@ -15,6 +15,12 @@
 \set Table_Part_01 lineitem_hash_complex_part_01
 \set Table_Part_02 lineitem_hash_complex_part_02
 \set Table_Part_03 lineitem_hash_complex_part_03
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
 -- Run hardcoded complex select query, and apply hash partitioning on query
 -- results
 SELECT worker_hash_partition_table(:JobId, :TaskId,
@@ -30,10 +36,10 @@ SELECT worker_hash_partition_table(:JobId, :TaskId,
 (1 row)
 
 -- Copy partitioned data files into tables for testing purposes
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00002';
-COPY :Table_Part_03 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00003';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
+COPY :Table_Part_03 FROM :'Table_File_03';
 SELECT COUNT(*) FROM :Table_Part_00;
  count 
 -------
diff --git a/src/test/regress/expected/worker_null_data_partition.out b/src/test/regress/expected/worker_null_data_partition.out
index 344658142..08b3e0976 100644
--- a/src/test/regress/expected/worker_null_data_partition.out
+++ b/src/test/regress/expected/worker_null_data_partition.out
@@ -11,6 +11,11 @@
 \set Range_Table_Part_00 supplier_range_part_00
 \set Range_Table_Part_01 supplier_range_part_01
 \set Range_Table_Part_02 supplier_range_part_02
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+\set File_Basedir  base/pgsql_job_cache
+\set Range_Table_File_00 :File_Basedir/job_:JobId/task_:Range_TaskId/p_00000.:userid
+\set Range_Table_File_01 :File_Basedir/job_:JobId/task_:Range_TaskId/p_00001.:userid
+\set Range_Table_File_02 :File_Basedir/job_:JobId/task_:Range_TaskId/p_00002.:userid
 -- Run select query, and apply range partitioning on query results. Note that
 -- one of the split point values is 0, We are checking here that the partition
 -- function doesn't treat 0 as null, and that range repartitioning correctly
@@ -24,9 +29,9 @@ SELECT worker_range_partition_table(:JobId, :Range_TaskId, :Select_Query_Text,
 (1 row)
 
 -- Copy partitioned data files into tables for testing purposes
-COPY :Range_Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101106/p_00000';
-COPY :Range_Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101106/p_00001';
-COPY :Range_Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101106/p_00002';
+COPY :Range_Table_Part_00 FROM :'Range_Table_File_00';
+COPY :Range_Table_Part_01 FROM :'Range_Table_File_01';
+COPY :Range_Table_Part_02 FROM :'Range_Table_File_02';
 SELECT COUNT(*) FROM :Range_Table_Part_00;
  count 
 -------
@@ -103,6 +108,10 @@ SELECT COUNT(*) AS diff_rhs_02 FROM (
 \set Hash_Table_Part_00 supplier_hash_part_00
 \set Hash_Table_Part_01 supplier_hash_part_01
 \set Hash_Table_Part_02 supplier_hash_part_02
+\set File_Basedir  base/pgsql_job_cache
+\set Hash_Table_File_00 :File_Basedir/job_:JobId/task_:Hash_TaskId/p_00000.:userid
+\set Hash_Table_File_01 :File_Basedir/job_:JobId/task_:Hash_TaskId/p_00001.:userid
+\set Hash_Table_File_02 :File_Basedir/job_:JobId/task_:Hash_TaskId/p_00002.:userid
 -- Run select query, and apply hash partitioning on query results
 SELECT worker_hash_partition_table(:JobId, :Hash_TaskId, :Select_Query_Text,
        				   :Partition_Column_Text, :Partition_Column_Type,
@@ -112,9 +121,9 @@ SELECT worker_hash_partition_table(:JobId, :Hash_TaskId, :Select_Query_Text,
  
 (1 row)
 
-COPY :Hash_Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101107/p_00000';
-COPY :Hash_Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101107/p_00001';
-COPY :Hash_Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101107/p_00002';
+COPY :Hash_Table_Part_00 FROM :'Hash_Table_File_00';
+COPY :Hash_Table_Part_01 FROM :'Hash_Table_File_01';
+COPY :Hash_Table_Part_02 FROM :'Hash_Table_File_02';
 SELECT COUNT(*) FROM :Hash_Table_Part_00;
  count 
 -------
diff --git a/src/test/regress/expected/worker_range_partition.out b/src/test/regress/expected/worker_range_partition.out
index 14e6203ed..bb4041ac3 100644
--- a/src/test/regress/expected/worker_range_partition.out
+++ b/src/test/regress/expected/worker_range_partition.out
@@ -12,11 +12,12 @@
 \set Table_Part_01 lineitem_range_part_01
 \set Table_Part_02 lineitem_range_part_02
 \set Table_Part_03 lineitem_range_part_03
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
 \set File_Basedir  base/pgsql_job_cache
-\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000
-\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001
-\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002
-\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
 -- Run select query, and apply range partitioning on query results
 SELECT worker_range_partition_table(:JobId, :TaskId, :Select_Query_Text,
        				    :Partition_Column_Text, :Partition_Column_Type,
diff --git a/src/test/regress/expected/worker_range_partition_complex.out b/src/test/regress/expected/worker_range_partition_complex.out
index 57b2c7795..ff739a3c1 100644
--- a/src/test/regress/expected/worker_range_partition_complex.out
+++ b/src/test/regress/expected/worker_range_partition_complex.out
@@ -12,6 +12,12 @@
 \set Table_Part_01 lineitem_range_complex_part_01
 \set Table_Part_02 lineitem_range_complex_part_02
 \set Table_Part_03 lineitem_range_complex_part_03
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
 -- Run hardcoded complex select query, and apply range partitioning on query
 -- results
 SELECT worker_range_partition_table(:JobId, :TaskId,
@@ -27,10 +33,10 @@ SELECT worker_range_partition_table(:JobId, :TaskId,
 (1 row)
 
 -- Copy partitioned data files into tables for testing purposes
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00002';
-COPY :Table_Part_03 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00003';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
+COPY :Table_Part_03 FROM :'Table_File_03';
 SELECT COUNT(*) FROM :Table_Part_00;
  count 
 -------
diff --git a/src/test/regress/sql/task_tracker_partition_task.sql b/src/test/regress/sql/task_tracker_partition_task.sql
index 3d8f40117..89fc0bbe2 100644
--- a/src/test/regress/sql/task_tracker_partition_task.sql
+++ b/src/test/regress/sql/task_tracker_partition_task.sql
@@ -14,6 +14,13 @@
 \set TablePart01 lineitem_partition_task_part_01
 \set TablePart02 lineitem_partition_task_part_02
 
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:PartitionTaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:PartitionTaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:PartitionTaskId/p_00002.:userid
+
 -- We assign a partition task and wait for it to complete. Note that we hardcode
 -- the partition function call string, including the job and task identifiers,
 -- into the argument in the task assignment function. This hardcoding is
@@ -29,9 +36,9 @@ SELECT pg_sleep(4.0);
 
 SELECT task_tracker_task_status(:JobId, :PartitionTaskId);
 
-COPY :TablePart00 FROM 'base/pgsql_job_cache/job_401010/task_801106/p_00000';
-COPY :TablePart01 FROM 'base/pgsql_job_cache/job_401010/task_801106/p_00001';
-COPY :TablePart02 FROM 'base/pgsql_job_cache/job_401010/task_801106/p_00002';
+COPY :TablePart00 FROM :'Table_File_00';
+COPY :TablePart01 FROM :'Table_File_01';
+COPY :TablePart02 FROM :'Table_File_02';
 
 SELECT COUNT(*) FROM :TablePart00;
 SELECT COUNT(*) FROM :TablePart02;
diff --git a/src/test/regress/sql/worker_binary_data_partition.sql b/src/test/regress/sql/worker_binary_data_partition.sql
index 168302634..d6469b968 100644
--- a/src/test/regress/sql/worker_binary_data_partition.sql
+++ b/src/test/regress/sql/worker_binary_data_partition.sql
@@ -18,6 +18,13 @@
 \set Table_Part_01 binary_data_table_part_01
 \set Table_Part_02 binary_data_table_part_02
 
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+
 -- Create table with special characters
 
 CREATE TABLE :Table_Name(textcolumn text, binarycolumn bytea);
@@ -52,9 +59,9 @@ CREATE TABLE :Table_Part_00 ( LIKE :Table_Name );
 CREATE TABLE :Table_Part_01 ( LIKE :Table_Name );
 CREATE TABLE :Table_Part_02 ( LIKE :Table_Name );
 
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101105/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101105/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101105/p_00002';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
 
 -- The union of the three partitions should have as many rows as original table
 
diff --git a/src/test/regress/sql/worker_hash_partition.sql b/src/test/regress/sql/worker_hash_partition.sql
index 6137638fe..7097de6dc 100644
--- a/src/test/regress/sql/worker_hash_partition.sql
+++ b/src/test/regress/sql/worker_hash_partition.sql
@@ -22,16 +22,24 @@
 \set Table_Part_02 lineitem_hash_part_02
 \set Table_Part_03 lineitem_hash_part_03
 
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
+
 -- Run select query, and apply hash partitioning on query results
 
 SELECT worker_hash_partition_table(:JobId, :TaskId, :Select_Query_Text,
        				   :Partition_Column_Text, :Partition_Column_Type::regtype,
 				   ARRAY[-2147483648, -1073741824, 0, 1073741824]::int4[]);
 
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00002';
-COPY :Table_Part_03 FROM 'base/pgsql_job_cache/job_201010/task_101103/p_00003';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
+COPY :Table_Part_03 FROM :'Table_File_03';
 
 SELECT COUNT(*) FROM :Table_Part_00;
 SELECT COUNT(*) FROM :Table_Part_01;
diff --git a/src/test/regress/sql/worker_hash_partition_complex.sql b/src/test/regress/sql/worker_hash_partition_complex.sql
index 722109332..9701e3bc2 100644
--- a/src/test/regress/sql/worker_hash_partition_complex.sql
+++ b/src/test/regress/sql/worker_hash_partition_complex.sql
@@ -22,6 +22,14 @@
 \set Table_Part_02 lineitem_hash_complex_part_02
 \set Table_Part_03 lineitem_hash_complex_part_03
 
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
+
 -- Run hardcoded complex select query, and apply hash partitioning on query
 -- results
 
@@ -35,10 +43,10 @@ SELECT worker_hash_partition_table(:JobId, :TaskId,
 
 -- Copy partitioned data files into tables for testing purposes
 
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00002';
-COPY :Table_Part_03 FROM 'base/pgsql_job_cache/job_201010/task_101104/p_00003';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
+COPY :Table_Part_03 FROM :'Table_File_03';
 
 SELECT COUNT(*) FROM :Table_Part_00;
 SELECT COUNT(*) FROM :Table_Part_03;
diff --git a/src/test/regress/sql/worker_null_data_partition.sql b/src/test/regress/sql/worker_null_data_partition.sql
index b6fa47d3d..d243feaf8 100644
--- a/src/test/regress/sql/worker_null_data_partition.sql
+++ b/src/test/regress/sql/worker_null_data_partition.sql
@@ -17,6 +17,13 @@
 \set Range_Table_Part_01 supplier_range_part_01
 \set Range_Table_Part_02 supplier_range_part_02
 
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+
+\set File_Basedir  base/pgsql_job_cache
+\set Range_Table_File_00 :File_Basedir/job_:JobId/task_:Range_TaskId/p_00000.:userid
+\set Range_Table_File_01 :File_Basedir/job_:JobId/task_:Range_TaskId/p_00001.:userid
+\set Range_Table_File_02 :File_Basedir/job_:JobId/task_:Range_TaskId/p_00002.:userid
+
 -- Run select query, and apply range partitioning on query results. Note that
 -- one of the split point values is 0, We are checking here that the partition
 -- function doesn't treat 0 as null, and that range repartitioning correctly
@@ -28,9 +35,9 @@ SELECT worker_range_partition_table(:JobId, :Range_TaskId, :Select_Query_Text,
 
 -- Copy partitioned data files into tables for testing purposes
 
-COPY :Range_Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101106/p_00000';
-COPY :Range_Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101106/p_00001';
-COPY :Range_Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101106/p_00002';
+COPY :Range_Table_Part_00 FROM :'Range_Table_File_00';
+COPY :Range_Table_Part_01 FROM :'Range_Table_File_01';
+COPY :Range_Table_Part_02 FROM :'Range_Table_File_02';
 
 SELECT COUNT(*) FROM :Range_Table_Part_00;
 SELECT COUNT(*) FROM :Range_Table_Part_02;
@@ -76,15 +83,20 @@ SELECT COUNT(*) AS diff_rhs_02 FROM (
 \set Hash_Table_Part_01 supplier_hash_part_01
 \set Hash_Table_Part_02 supplier_hash_part_02
 
+\set File_Basedir  base/pgsql_job_cache
+\set Hash_Table_File_00 :File_Basedir/job_:JobId/task_:Hash_TaskId/p_00000.:userid
+\set Hash_Table_File_01 :File_Basedir/job_:JobId/task_:Hash_TaskId/p_00001.:userid
+\set Hash_Table_File_02 :File_Basedir/job_:JobId/task_:Hash_TaskId/p_00002.:userid
+
 -- Run select query, and apply hash partitioning on query results
 
 SELECT worker_hash_partition_table(:JobId, :Hash_TaskId, :Select_Query_Text,
        				   :Partition_Column_Text, :Partition_Column_Type,
 				   ARRAY[-2147483648, -1073741824, 0, 1073741824]::int4[]);
 
-COPY :Hash_Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101107/p_00000';
-COPY :Hash_Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101107/p_00001';
-COPY :Hash_Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101107/p_00002';
+COPY :Hash_Table_Part_00 FROM :'Hash_Table_File_00';
+COPY :Hash_Table_Part_01 FROM :'Hash_Table_File_01';
+COPY :Hash_Table_Part_02 FROM :'Hash_Table_File_02';
 
 SELECT COUNT(*) FROM :Hash_Table_Part_00;
 SELECT COUNT(*) FROM :Hash_Table_Part_02;
diff --git a/src/test/regress/sql/worker_range_partition.sql b/src/test/regress/sql/worker_range_partition.sql
index 32d55bbda..cb225f2d5 100644
--- a/src/test/regress/sql/worker_range_partition.sql
+++ b/src/test/regress/sql/worker_range_partition.sql
@@ -18,11 +18,13 @@
 \set Table_Part_02 lineitem_range_part_02
 \set Table_Part_03 lineitem_range_part_03
 
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+
 \set File_Basedir  base/pgsql_job_cache
-\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000
-\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001
-\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002
-\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
 
 -- Run select query, and apply range partitioning on query results
 
diff --git a/src/test/regress/sql/worker_range_partition_complex.sql b/src/test/regress/sql/worker_range_partition_complex.sql
index a9ff2fccd..fd23f5989 100644
--- a/src/test/regress/sql/worker_range_partition_complex.sql
+++ b/src/test/regress/sql/worker_range_partition_complex.sql
@@ -18,6 +18,14 @@
 \set Table_Part_02 lineitem_range_complex_part_02
 \set Table_Part_03 lineitem_range_complex_part_03
 
+SELECT usesysid AS userid FROM pg_user WHERE usename = current_user \gset
+
+\set File_Basedir  base/pgsql_job_cache
+\set Table_File_00 :File_Basedir/job_:JobId/task_:TaskId/p_00000.:userid
+\set Table_File_01 :File_Basedir/job_:JobId/task_:TaskId/p_00001.:userid
+\set Table_File_02 :File_Basedir/job_:JobId/task_:TaskId/p_00002.:userid
+\set Table_File_03 :File_Basedir/job_:JobId/task_:TaskId/p_00003.:userid
+
 -- Run hardcoded complex select query, and apply range partitioning on query
 -- results
 
@@ -31,10 +39,10 @@ SELECT worker_range_partition_table(:JobId, :TaskId,
 
 -- Copy partitioned data files into tables for testing purposes
 
-COPY :Table_Part_00 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00000';
-COPY :Table_Part_01 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00001';
-COPY :Table_Part_02 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00002';
-COPY :Table_Part_03 FROM 'base/pgsql_job_cache/job_201010/task_101102/p_00003';
+COPY :Table_Part_00 FROM :'Table_File_00';
+COPY :Table_Part_01 FROM :'Table_File_01';
+COPY :Table_Part_02 FROM :'Table_File_02';
+COPY :Table_Part_03 FROM :'Table_File_03';
 
 SELECT COUNT(*) FROM :Table_Part_00;
 SELECT COUNT(*) FROM :Table_Part_03;