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EXPLAIN FORMAT=JSON: produce used_key_parts, JSON-ish output for index_merge.

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This commit is contained in:
Sergei Petrunia
2014-08-14 01:12:05 +04:00
parent a9d43d70f5
commit 041e03e251
6 changed files with 274 additions and 47 deletions
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10
sql/sql_select.cc
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@ -23310,7 +23310,7 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
quick_type= -1;
QUICK_SELECT_I *quick= NULL;
eta->key.set(thd->mem_root, NULL, (uint)-1);
eta->key.clear();
eta->quick_info= NULL;
tab->tracker= &eta->tracker;
@ -23437,7 +23437,7 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
if (key_info) /* 'index' or 'ref' access */
{
eta->key.set(thd->mem_root, key_info->name, key_len);
eta->key.set(thd->mem_root, key_info, key_len);
if (tab->ref.key_parts && tab_type != JT_FT)
{
@ -23458,8 +23458,10 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
if (tab_type == JT_HASH_NEXT) /* full index scan + hash join */
{
eta->hash_next_key.set(thd->mem_root,
table->key_info[tab->index].name,
& table->key_info[tab->index],
table->key_info[tab->index].key_length);
// psergey-todo: ^ is the above correct? are we necessarily joining on all
// columns?
}
if (!key_info)
@ -23490,7 +23492,7 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
}
if (key_name_buf.length())
eta->key.set(thd->mem_root, key_name_buf.c_ptr_safe(), -1);
eta->key.set_pseudo_key(thd->mem_root, key_name_buf.c_ptr_safe());
}
}