Truncate col names to 64 chars in MockSyncStream::get_result_set_struct(). Update test sample file.

t/pt-upgrade/basics.t

@@ -198,6 +198,7 @@ ok(
    no_diff(
       sub { pt_upgrade::main(@args,
          qw(--compare-results-method rows),
+         qw(--no-clear-warnings),
          "$log/004/select-func.log") },
       "$sample/004/select-func.txt",
    ),

t/pt-upgrade/samples/004/select-func.txt

@@ -0,0 +1,36 @@
+
+# Query 1: ID 0xF05C9711D543F5BF at byte 0 _______________________________
+# host1: 127.1:12345
+# host2: 127.1:12348
+# Found 0 differences in 1 samples:
+#   column counts   0
+#   column types    0
+#   column values   0
+#   row counts      0
+#   warning counts  0
+#   warning levels  0
+#   warnings        0
+#            host1 host2
+# Errors         0     0
+# Warnings       0     0
+# Query_time            
+#   sum          0     0
+#   min          0     0
+#   max          0     0
+#   avg          0     0
+#   pct_95       0     0
+#   stddev       0     0
+#   median       0     0
+# row_count             
+#   sum          1     1
+#   min          1     1
+#   max          1     1
+#   avg          1     1
+#   pct_95       1     1
+#   stddev       0     0
+#   median       1     1
+use `test`;
+SELECT (UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP('2012-09-16 10:16:36')) / 60, SLEEP(1)
+
+# Statistics
+# events                         1