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Fixed numerous problems for mutually recursive CTE.

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Actually mutually recursive CTE were not functional. Now the code
for mutually recursive CTE looks like functional, but still needs
re-writing.
Added many new test cases for mutually recursive CTE.
This commit is contained in:
Igor Babaev
2016-06-06 10:01:16 -07:00
parent 6c6c3af6aa
commit 0a6e6d705b
8 changed files with 653 additions and 32 deletions
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13
sql/sql_select.cc
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@@ -11605,7 +11605,12 @@ bool JOIN_TAB::preread_init()
}
/* Materialize derived table/view. */
if ((!derived->get_unit()->executed || derived->is_recursive_with_table()) &&
if ((!derived->get_unit()->executed ||
(derived->is_recursive_with_table() &&
(!derived->is_with_table_recursive_reference() ||
(!derived->with->is_driving_recursive() &&
!derived->with->is_incr_ready()) &&
!derived->with->all_are_stabilized()))) &&
mysql_handle_single_derived(join->thd->lex,
derived, DT_CREATE | DT_FILL))
return TRUE;
@@ -18236,7 +18241,8 @@ sub_select(JOIN *join,JOIN_TAB *join_tab,bool end_of_records)
flush_dups_table->sj_weedout_delete_rows();
}
if (!join_tab->preread_init_done && join_tab->preread_init())
if ((!join_tab->preread_init_done || join_tab->table->is_rec_table) &&
join_tab->preread_init())
DBUG_RETURN(NESTED_LOOP_ERROR);
join->return_tab= join_tab;
@@ -19189,7 +19195,8 @@ int join_init_read_record(JOIN_TAB *tab)
report_error(tab->table, error);
return 1;
}
if (!tab->preread_init_done && tab->preread_init())
if ((!tab->preread_init_done || tab->table->is_rec_table) &&
tab->preread_init())
return 1;
if (init_read_record(&tab->read_record, tab->join->thd, tab->table,
tab->select, tab->filesort_result, 1,1, FALSE))