[feat] Support multiple aggregations and statistics at once when querying performance data

reframe/frontend/cli.py

@@ -702,6 +702,14 @@ def main():
         help='The delimiter to use when using `--table-format=csv`',
         envvar='RFM_TABLE_FORMAT_DELIM', configvar='general/table_format_delim'
     )
+    misc_options.add_argument(
+        '--term-lhs', action='store',
+        help='LHS term in performance comparisons'
+    )
+    misc_options.add_argument(
+        '--term-rhs', action='store',
+        help='RHS term in performance comparisons'
+    )
     misc_options.add_argument(
         '-v', '--verbose', action='count',
         help='Increase verbosity level of output',
@@ -1127,7 +1135,9 @@ def restrict_logging():
                                   lambda htype: htype != 'stream')
         with exit_gracefully_on_error('failed to retrieve session data',
                                       printer):
-            printer.info(reporting.session_info(options.describe_stored_sessions))
+            printer.info(
+                reporting.session_info(options.describe_stored_sessions)
+            )
             sys.exit(0)
 
     if options.describe_stored_testcases:
@@ -1154,8 +1164,9 @@ def restrict_logging():
 
     if options.performance_compare:
         namepatt = '|'.join(n.replace('%', ' %') for n in options.names)
-        with exit_gracefully_on_error('failed to generate performance report',
-                                      printer):
+        with exit_gracefully_on_error(
+            'failed to generate performance comparison', printer
+        ):
             filt = [None, None]
             if options.filter_expr is not None:
                 if len(options.filter_expr) == 1:
@@ -1168,8 +1179,10 @@ def restrict_logging():
                     sys.exit(1)
 
             printer.table(
-                reporting.performance_compare(options.performance_compare,
-                                              None, namepatt, *filt)
+                reporting.performance_compare(
+                    options.performance_compare, None, namepatt, *filt,
+                    options.term_lhs, options.term_rhs
+                )
             )
             sys.exit(0)
 
@@ -1769,7 +1782,9 @@ def module_unuse(*paths):
                 try:
                     if rt.get_option('storage/0/enable'):
                         data = reporting.performance_compare(
-                            rt.get_option('general/0/perf_report_spec'), report
+                            rt.get_option('general/0/perf_report_spec'), report,
+                            term_lhs=options.term_lhs,
+                            term_rhs=options.term_rhs
                         )
                     else:
                         data = report.report_data()

reframe/frontend/printer.py

@@ -286,7 +286,8 @@ def table(self, data, **kwargs):
 
         table_format = rt.runtime().get_option('general/0/table_format')
         if table_format == 'csv':
-            return self._table_as_csv(data)
+            self._table_as_csv(data)
+            return
 
         # Map our options to tabulate
         if table_format == 'plain':