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Fixed bug mdev-11674.

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1. The rows of a recursive CTE at some point may overflow
the HEAP temporary table containing them. At this point
the table is converted to a MyISAM temporary table and the
new added rows are placed into this MyISAM table.
A bug in the of select_union_recursive::send_data prevented
the server from writing the row that caused the overflow
into the temporary table used for the result of the iteration
steps. This could lead, in particular,to a premature end
of the iterations.
2. The method TABLE::insert_all_rows_into() that was used
to copy all rows of one temporary table into another
did not take into account that the destination temporary
table must be converted to a MyISAM table at some point.
This patch fixed this problem. It also renamed the method
into TABLE::insert_all_rows_into_tmp_table() and added
an extra parameter needed for the conversion.
This commit is contained in:
Igor Babaev
2017-01-04 14:33:24 -08:00
parent a758479c10
commit 348ccb6f03
6 changed files with 74 additions and 15 deletions
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5
sql/sql_derived.cc
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@ -969,7 +969,10 @@ bool TABLE_LIST::fill_recursive(THD *thd)
if (!rc)
{
TABLE *src= with->rec_result->table;
rc =src->insert_all_rows_into(thd, table, true);
rc =src->insert_all_rows_into_tmp_table(thd,
table,
&with->rec_result->tmp_table_param,
true);
}
return rc;
}