t/pt-query-digest/explain.t fails on MySQL 5.5 and CentOS 5.5

[Baron Schwartz]

This test fails 100% repeatably on MySQL 5.5 and CentOS 5.5:

[baron@localhost stabilize-test-suite]$ perl t/pt-query-digest/explain.t
1..6
# 5c5
# < # EXPLAIN sparkline: I
# ---
# > # EXPLAIN sparkline: s
# 40c40
# < # type: index
# ---
# > # type: system
# 42,43c42,43
# < # key: fruit
# < # key_len: 27
# ---
# > # key: NULL
# > # key_len: NULL
# 45,46c45,46
# < # rows: 1
# < # Extra: Using index
# ---
# > # rows: 0
# > # Extra: const row not found
not ok 1 - Analysis for slow007 with --explain, no rows
# Failed test 'Analysis for slow007 with --explain, no rows'
# in t/pt-query-digest/explain.t at line 51.
ok 2 - Analysis for slow007 with --explain
ok 3 - EXPLAIN sparkline in profile
ok 4 - Analysis for slow007 with --explain, failed
ok 5 - --explain sparkline uses event db and doesn't crash ea (issue 1196
ok 6 - Sandbox servers
# Looks like you failed 1 test of 6.

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PT-983