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EXPLAIN UNION using same routing which used for execution which allow return correct bug messages (Bug #3639)

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EXPLAIN of hidden SELECT of UNION


mysql-test/r/derived.result:
  explain of hidden select
mysql-test/r/subselect.result:
  explain of hidden select
mysql-test/r/union.result:
  explain of hidden select
  correct error messages on explain
mysql-test/t/subselect.test:
  show eliminated costants in WHERE clause
mysql-test/t/union.test:
  correct error messages on EXPLAIN with union
sql/item.cc:
  fixed name constructing for global ORDER BY items
sql/sql_class.h:
  select ID can be negative (for hidden SELECTs)
  removed unused field
sql/sql_lex.cc:
  new flag of UNION EXPLAIN
sql/sql_lex.h:
  new flag of UNION EXPLAIN
  select ID can be negative (for hidden SELECTs)
sql/sql_select.cc:
  EXPLAIN UNION using same routing which used for execution
  explain for hidden SELECT of UNION
sql/sql_union.cc:
  EXPLAIN UNION using same routing which used for execution
This commit is contained in:
unknown
2004-05-06 20:40:21 +03:00
parent cd57fc8bda
commit 1a4f499ca8
11 changed files with 179 additions and 74 deletions
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3
sql/sql_class.h
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@@ -768,7 +768,7 @@ public:
uint current_tablenr,tmp_table;
uint server_status,open_options,system_thread;
uint32 db_length;
uint select_number; //number of select (used for EXPLAIN)
int select_number; //number of select (used for EXPLAIN)
/* variables.transaction_isolation is reset to this after each commit */
enum_tx_isolation session_tx_isolation;
enum_check_fields count_cuted_fields;
@@ -1147,7 +1147,6 @@ class select_union :public select_result {
TABLE *table;
COPY_INFO info;
TMP_TABLE_PARAM tmp_table_param;
bool not_describe;
select_union(TABLE *table_par);
~select_union();