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[CP] Disable view merge which generate stmt with more than 10 tables

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This commit is contained in:
xianyu-w
2023-11-23 08:40:54 +00:00
committed by ob-robot
parent dd4fe92807
commit f54b7d8456
2 changed files with 9 additions and 0 deletions
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4
src/sql/rewrite/ob_transform_groupby_pullup.cpp
View File

@ -348,6 +348,10 @@ int ObTransformGroupByPullup::check_groupby_pullup_validity(ObDMLStmt *stmt,
OPT_TRACE("view has rand expr, can not transform");
} else if (OB_FALSE_IT(helper.need_merge_ = (NULL != myhint
&& myhint->enable_group_by_pull_up(ctx_->src_qb_name_)))) {
} else if (!helper.need_merge_ && stmt->get_table_size() > 1 && sub_stmt->get_table_size() > 1 &&
stmt->get_table_size() + sub_stmt->get_table_size() - 1 > 10) {
// More than 10 tables may result in the inability to enumerate a valid join order.
OPT_TRACE("Too Many Table Items");
} else if (OB_FAIL(valid_views.push_back(helper))) {
LOG_WARN("failed to push back group stmt index", K(ret));
} else {

5
src/sql/rewrite/ob_transform_view_merge.cpp
View File

@ -530,6 +530,11 @@ int ObTransformViewMerge::check_basic_validity(ObDMLStmt *parent_stmt,
|| child_stmt->is_values_table_query()) {
can_be = false;
OPT_TRACE("not a valid view");
} else if (!force_merge && parent_stmt->get_table_size() > 1 && child_stmt->get_table_size() > 1 &&
parent_stmt->get_table_size() + child_stmt->get_table_size() - 1 > 10) {
// More than 10 tables may result in the inability to enumerate a valid join order.
can_be = false;
OPT_TRACE("Too Many Table Items");
} else if (OB_FAIL(ObTransformUtils::check_has_assignment(*child_stmt, has_assignment))) {
LOG_WARN("check has assignment failed", K(ret));
} else if (has_assignment) {