1 files changed, 47 insertions, 0 deletions
diff --git a/mysql-test/include/expect_qep.inc b/mysql-test/include/expect_qep.inc
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+++ b/mysql-test/include/expect_qep.inc
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+# include/expect_qep.inc
+#
+# SUMMARY
+#
+#    Designed to be used together with include/check_qep.inc
+#
+#    $query should be assigned a select statement using
+#    straight_join to force the tables to be joined in most
+#    optimal order.
+#
+#    expect_qep.inc will then store the estimated 'Last_query_cost'
+#    and total # 'Handler_read%' for this straight_joined query.
+#
+#    We should then assign a non-straight_join'ed version of
+#    the same query to $query and execute it using
+#    'include/check_qep.inc'. Its estimated cost and
+#    #handler_reads will then be verified against the
+#    previous straight_joined query.
+#
+# USAGE
+#
+#    let $query= <select straight_join optimal statement>;
+#    --source include/expect_qep.inc
+#    let $query= <select statement>;
+#    --source include/check_qep.inc
+#
+# EXAMPLE
+#    t/greedy_optimizer.test
+#
+
+flush status;
+eval EXPLAIN $query;
+--disable_ps2_protocol
+eval $query;
+--enable_ps2_protocol
+
+let $best_cost=
+  query_get_value(SHOW STATUS LIKE 'Last_query_cost', Value, 1);
+
+--disable_warnings
+let $best_reads=
+`select sum(variable_value)
+   from information_schema.session_status
+   where VARIABLE_NAME like 'Handler_read%'`;
+--enable_warnings
+
+#echo Expect, cost: $best_cost, Handler_reads: $best_reads;