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MDEV-3798: EXPLAIN UPDATE/DELETE

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- Handle the case when EXPLAIN UPDATE/DELETE has pruned away all partitions.
This commit is contained in:
Sergey Petrunya
2013-10-05 13:44:01 +04:00
parent 72bc6d7364
commit abcf14e595
7 changed files with 73 additions and 9 deletions
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6
sql/sql_explain.cc
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@@ -766,9 +766,11 @@ int Explain_update::print_explain(Explain_query *query,
uint8 explain_flags)
{
StringBuffer<64> extra_str;
if (impossible_where)
if (impossible_where || no_partitions)
{
const char *msg= "Impossible where";
const char *msg= impossible_where ?
"Impossible where" :
"No matching rows after partition pruning";
int res= print_explain_message_line(output, explain_flags,
1 /*select number*/,
select_type, msg);