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MDEV-6109: EXPLAIN JSON

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- First code, "EXPLAIN FORMAT=JSON stmt" and "ANALYZE FORMAT=JSON stmt"
  work for basic queries.  Complex constructs (e.g subqueries, etc) not
  yet supported.
- No test infrastructure yet
This commit is contained in:
Sergei Petrunia
2014-05-27 21:04:45 +04:00
parent 0925ab9d88
commit 5cfd3270ec
15 changed files with 642 additions and 111 deletions
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43
sql/sql_parse.cc
View File

@ -97,6 +97,8 @@
#include "log_slow.h"
#include "sql_bootstrap.h"
#include "my_json_writer.h"
#define FLAGSTR(V,F) ((V)&(F)?#F" ":"")
#ifdef WITH_ARIA_STORAGE_ENGINE
@ -5233,20 +5235,39 @@ static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
top-level LIMIT
*/
result->reset_offset_limit();
thd->lex->explain->print_explain(result, thd->lex->describe,
thd->lex->analyze_stmt);
if (lex->describe & DESCRIBE_EXTENDED)
if (thd->lex->explain_json)
{
char buff[1024];
String str(buff,(uint32) sizeof(buff), system_charset_info);
str.length(0);
/*
The warnings system requires input in utf8, @see
mysqld_show_warnings().
Json_writer writer;
writer.start_object();
thd->lex->explain->print_explain_json(&writer, thd->lex->analyze_stmt);
writer.end_object();
const CHARSET_INFO *cs= system_charset_info;
List<Item> item_list;
String *buf= &writer.output;
item_list.push_back(new Item_string(buf->ptr(), buf->length(), cs));
result->send_data(item_list);
*/
thd->lex->unit.print(&str, QT_TO_SYSTEM_CHARSET);
push_warning(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_YES, str.c_ptr_safe());
thd->lex->explain->print_explain_json(result, thd->lex->analyze_stmt);
}
else
{
thd->lex->explain->print_explain(result, thd->lex->describe,
thd->lex->analyze_stmt);
if (lex->describe & DESCRIBE_EXTENDED)
{
char buff[1024];
String str(buff,(uint32) sizeof(buff), system_charset_info);
str.length(0);
/*
The warnings system requires input in utf8, @see
mysqld_show_warnings().
*/
thd->lex->unit.print(&str, QT_TO_SYSTEM_CHARSET);
push_warning(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_YES, str.c_ptr_safe());
}
}
}