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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_lex.h
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@ -336,6 +336,7 @@ public:
st_select_lex *fake_select_lex;
st_select_lex *union_distinct; /* pointer to the last UNION DISTINCT */
bool describe; /* union exec() called for EXPLAIN */
void init_query();
bool create_total_list(THD *thd, st_lex *lex, TABLE_LIST **result);
@ -413,7 +414,7 @@ public:
ulong table_join_options;
uint in_sum_expr;
uint select_number; /* number of select (used for EXPLAIN) */
int select_number; /* number of select (used for EXPLAIN) */
uint with_wild; /* item list contain '*' */
bool braces; /* SELECT ... UNION (SELECT ... ) <- this braces */
/* TRUE when having fix field called in processing of this SELECT */