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Fix aggregation result error in subquery with union

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This commit is contained in:
obdev
2023-08-28 12:14:23 +00:00
committed by ob-robot
parent 6460edca56
commit cf8e2df00e
1 changed files with 11 additions and 4 deletions
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15
src/sql/resolver/dml/ob_aggr_expr_push_up_analyzer.cpp
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@ -243,10 +243,17 @@ ObSelectResolver *ObAggrExprPushUpAnalyzer::fetch_final_aggr_resolver(ObDMLResol
|| T_HAVING_SCOPE == cur_resolver->get_parent_namespace_resolver()->get_current_scope()
|| (T_ORDER_SCOPE == cur_resolver->get_parent_namespace_resolver()->get_current_scope()
&& T_WHERE_SCOPE != cur_resolver->get_current_scope()))) {
if (cur_resolver->is_select_resolver() && static_cast<ObSelectResolver*>(cur_resolver)->is_in_set_query()) {
//当前resolver是位于union等关键字标识的set query中，aggr function不再铺上给union上层的查询
//例如：SELECT (SELECT MAX(t1.b) from t2 union select 1 from t2 where 12 < 3) FROM t1 GROUP BY t1.a;
//MAX(t1.b)中引用了第一层的属性，但是MAX(t1.b)整个表达式保留在union的左支中
if (lib::is_oracle_mode() && cur_resolver->is_select_resolver()) {
/*
* bug fix:
*
* SELECT (SELECT COUNT(t1.a) from dual) FROM t1 GROUP BY t1.a;
* *
* SELECT (SELECT COUNT(t1.a) union select 1 where 1>2) FROM t1 GROUP BY t1.a;
* *
* For oracle, aggr func always belongs to the subquery, does not need to push up.
* For mysql, aggr func belongs to the upper level, whether there is a "union" or not.
*/
} else {
ObDMLResolver *next_resolver = cur_resolver->get_parent_namespace_resolver();
final_resolver = fetch_final_aggr_resolver(next_resolver, min_level_resolver);