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set the initial value of wrs to scn min

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This commit is contained in:
obdev
2022-11-28 02:55:06 +00:00
committed by ob-robot
parent 99d4f56fec
commit 87a9357186
406 changed files with 6473 additions and 50308 deletions
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113
src/sql/rewrite/ob_transform_predicate_move_around.cpp
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@ -823,8 +823,6 @@ int ObTransformPredicateMoveAround::pushdown_predicates(
} else if (OB_ISNULL(pullup_preds)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("pullup predicate array is null", K(ret));
} else if (enable_no_pred_deduce) {
//do nothing
} else if (stmt->is_set_stmt()) {
ObSelectStmt *sel_stmt = static_cast<ObSelectStmt*>(stmt);
if (OB_FAIL(pushdown_into_set_stmt(sel_stmt,
@ -845,6 +843,8 @@ int ObTransformPredicateMoveAround::pushdown_predicates(
LOG_WARN("failed to push down predicates", K(ret));
} else {/*do nothing*/}
}
} else if (enable_no_pred_deduce) {
//do nothing
} else {
if (OB_FAIL(stmt->has_rownum(has_rownum))) {
LOG_WARN("failed to check stmt has rownum", K(ret));
@ -912,10 +912,10 @@ int ObTransformPredicateMoveAround::pushdown_predicates(
LOG_WARN("failed to push down predicates", K(ret));
}
}
}
if (OB_SUCC(ret)) {
if (OB_FAIL(check_transform_happened(stmt, old_where_preds, stmt->get_condition_exprs()))) {
LOG_WARN("failed to check transform happened", K(ret));
if (OB_SUCC(ret)) {
if (OB_FAIL(check_transform_happened(stmt, old_where_preds, stmt->get_condition_exprs()))) {
LOG_WARN("failed to check transform happened", K(ret));
}
}
}
return ret;
@ -982,10 +982,6 @@ int ObTransformPredicateMoveAround::check_pushdown_predicates(ObSelectStmt *stmt
if (OB_ISNULL(stmt)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stmt is null", K(ret));
} else if (OB_FAIL(check_enable_no_pred_deduce(*stmt, enable_no_pred_deduce))) {
LOG_WARN("check_enable_no_pred_deduce failed", K(ret));
} else if (enable_no_pred_deduce) {
//do nothing
} else if (!stmt->is_set_stmt()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stmt is not a set stmt", K(ret));
@ -1917,41 +1913,32 @@ int ObTransformPredicateMoveAround::check_transform_happened(ObDMLStmt *stmt,
ObIArray<ObRawExpr *> &new_conditions)
{
int ret = OB_SUCCESS;
bool recover = false;
const ObQueryHint *query_hint = stmt->get_stmt_hint().query_hint_;
const ObTransHint *hint = static_cast<const ObTransHint *>(get_hint(stmt->get_stmt_hint()));
if (OB_ISNULL(query_hint)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected null", K(ret), K(ctx_), K(query_hint));
} else if (query_hint->has_outline_data()) {
if (hint == NULL) {
recover = true;
}
}
if (OB_SUCC(ret) && recover) {
} else if (query_hint->has_outline_data() && hint == NULL) {
if (OB_FAIL(new_conditions.assign(old_conditions))) {
LOG_WARN("assign failed", K(ret));
}
}
for (int64_t i = 0; OB_SUCC(ret) && i < new_conditions.count(); ++i) {
if (!ObOptimizerUtil::find_equal_expr(old_conditions, new_conditions.at(i))) {
trans_happened_ = true;
if (ObOptimizerUtil::find_item(transed_stmts_, stmt)) {
//do nothing
} else if (OB_FAIL(transed_stmts_.push_back(stmt))) {
LOG_WARN("push back failed", K(ret));
} else {
bool is_happened = false;
for (int64_t i = 0; OB_SUCC(ret) && !is_happened && i < new_conditions.count(); ++i) {
if (!ObOptimizerUtil::find_equal_expr(old_conditions, new_conditions.at(i))) {
is_happened = true;
}
}
}
for (int64_t i = 0; OB_SUCC(ret) && i < old_conditions.count(); ++i) {
if (!ObOptimizerUtil::find_equal_expr(new_conditions, old_conditions.at(i))) {
for (int64_t i = 0; OB_SUCC(ret) && !is_happened && i < old_conditions.count(); ++i) {
if (!ObOptimizerUtil::find_equal_expr(new_conditions, old_conditions.at(i))) {
is_happened = true;
}
}
if (OB_SUCC(ret) && is_happened) {
trans_happened_ = true;
if (ObOptimizerUtil::find_item(transed_stmts_, stmt)) {
//do nothing
} else if (OB_FAIL(transed_stmts_.push_back(stmt))) {
LOG_WARN("push back failed", K(ret));
if (OB_FAIL(add_var_to_array_no_dup(transed_stmts_, stmt))) {
LOG_WARN("append failed", K(ret));
}
}
}
@ -2084,6 +2071,58 @@ int ObTransformPredicateMoveAround::pushdown_into_semi_info(ObDMLStmt *stmt,
return ret;
}
int ObTransformPredicateMoveAround::extract_semi_right_table_filter(ObDMLStmt *stmt,
SemiInfo *semi_info,
ObIArray<ObRawExpr *> &right_filters)
{
int ret = OB_SUCCESS;
ObSqlBitSet<> right_table_set;
if (OB_ISNULL(stmt) || OB_ISNULL(semi_info)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("params have null", K(ret), K(stmt), K(semi_info));
} else if (OB_FAIL(stmt->get_table_rel_ids(semi_info->right_table_id_,
right_table_set))) {
LOG_WARN("failed to get right table set", K(ret));
}
for (int64_t i = 0; OB_SUCC(ret) && i < semi_info->semi_conditions_.count(); ++i) {
ObRawExpr *expr = semi_info->semi_conditions_.at(i);
bool has = false;
if (OB_ISNULL(expr)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("source expr shoud not be null", K(ret));
} else if (expr->get_relation_ids().is_empty()) {
// do nothing
} else if (!right_table_set.is_superset2(expr->get_relation_ids())) {
/* do nothing */
} else if (OB_FAIL(check_has_shared_query_ref(expr, has))) {
LOG_WARN("failed to check has shared query ref", K(ret));
} else if (has) {
// do nothing
} else if (OB_FAIL(right_filters.push_back(expr))) {
LOG_WARN("failed to push back column expr", K(ret));
}
}
return ret;
}
int ObTransformPredicateMoveAround::check_has_shared_query_ref(ObRawExpr *expr, bool &has)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(expr)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("expr is null", K(ret), K(expr));
} else if (expr->is_query_ref_expr() && expr->get_ref_count() > 1) {
has = true;
} else if (expr->has_flag(CNT_SUB_QUERY)) {
for (int64_t i = 0; OB_SUCC(ret) && !has && i < expr->get_param_count(); ++i) {
if (OB_FAIL(SMART_CALL(check_has_shared_query_ref(expr->get_param_expr(i), has)))) {
LOG_WARN("failed to check has shared query ref", K(ret));
}
}
}
return ret;
}
// pushdown right table filter in semi condition:
// 1. if right table is a basic table, create a generate table.
// 2. pushdown the right table filters into the generate table.
@ -2104,8 +2143,7 @@ int ObTransformPredicateMoveAround::pushdown_semi_info_right_filter(ObDMLStmt *s
} else if (OB_ISNULL(right_table = stmt->get_table_item_by_id(semi_info->right_table_id_))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected null", K(ret), K(right_table));
} else if (OB_FAIL(ObTransformUtils::extract_table_exprs(*stmt, semi_info->semi_conditions_,
*right_table, right_filters))) {
} else if (OB_FAIL(extract_semi_right_table_filter(stmt, semi_info, right_filters))) {
LOG_WARN("failed to extract table exprs", K(ret));
} else if (right_filters.empty()) {
// do nothing
@ -2117,8 +2155,7 @@ int ObTransformPredicateMoveAround::pushdown_semi_info_right_filter(ObDMLStmt *s
LOG_WARN("failed to create view with table", K(ret));
} else if (FALSE_IT(right_filters.reuse())) {
// do nothing
} else if (OB_FAIL(ObTransformUtils::extract_table_exprs(*stmt, semi_info->semi_conditions_,
*right_table, right_filters))) {
} else if (OB_FAIL(extract_semi_right_table_filter(stmt, semi_info, right_filters))) {
LOG_WARN("failed to extract table exprs", K(ret));
}