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fixed bug of multi-level EXPLAIN

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mysql-test/r/subselect.result:
  test of multi-level EXPLAIN
mysql-test/t/subselect.test:
  test of multi-level EXPLAIN
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unknown
2002-10-13 14:25:16 +03:00
parent 102cec1465
commit a299a27021
7 changed files with 25 additions and 4 deletions
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7
sql/sql_union.cc
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@ -104,11 +104,16 @@ bool select_union::flush()
typedef JOIN * JOIN_P;
int st_select_lex_unit::prepare(THD *thd, select_result *result)
{
DBUG_ENTER("st_select_lex_unit::prepare");
if (prepared)
DBUG_RETURN(0);
prepared= 1;
describe=(first_select()->options & SELECT_DESCRIBE) ? 1 : 0;
res= 0;
found_rows_for_union= false;
TMP_TABLE_PARAM tmp_table_param;
DBUG_ENTER("st_select_lex_unit::prepare");
this->thd= thd;
this->result= result;
SELECT_LEX *lex_select_save= thd->lex.select;