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oceanbase/src/sql/ob_update_stmt_printer.cpp
obdev e03cb03357 PATCH bugfix to opensource branch
2021-07-19 22:33:13 +08:00

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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#define USING_LOG_PREFIX SQL
#include "sql/ob_update_stmt_printer.h"
#include "sql/ob_sql_context.h"
#include "sql/resolver/expr/ob_raw_expr_util.h"
#include "sql/resolver/dml/ob_select_stmt.h"
namespace oceanbase {
using namespace common;
namespace sql {
void ObUpdateStmtPrinter::init(char* buf, int64_t buf_len, int64_t* pos, ObUpdateStmt* stmt)
{
ObDMLStmtPrinter::init(buf, buf_len, pos, stmt);
}
int ObUpdateStmtPrinter::do_print()
{
int ret = OB_SUCCESS;
if (OB_UNLIKELY(!is_inited_)) {
ret = OB_NOT_INIT;
LOG_WARN("not inited!", K(ret));
} else if (OB_ISNULL(stmt_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stmt should not be NULL", K(ret));
} else {
expr_printer_.init(buf_, buf_len_, pos_, print_params_);
if (OB_FAIL(print())) {
LOG_WARN("fail to print stmt", K(ret));
}
}
return ret;
}
int ObUpdateStmtPrinter::print()
{
int ret = OB_SUCCESS;
if (OB_ISNULL(stmt_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stmt_ should not be NULL", K(ret));
} else if (OB_FAIL(print_basic_stmt())) {
LOG_WARN("fail to print basic stmt", K(ret), K(*stmt_));
} else { /*do nothing*/
}
return ret;
}
int ObUpdateStmtPrinter::print_basic_stmt()
{
int ret = OB_SUCCESS;
if (OB_ISNULL(stmt_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stmt_ should not be NULL", K(ret));
} else if (OB_FAIL(print_update())) {
LOG_WARN("fail to print select", K(ret), K(*stmt_));
} else if (OB_FAIL(print_from(false /*not need from, only print table name*/))) {
LOG_WARN("fail to print from", K(ret), K(*stmt_));
} else if (OB_FAIL(print_set())) {
LOG_WARN("fail to print from", K(ret), K(*stmt_));
} else if (OB_FAIL(print_where())) {
LOG_WARN("fail to print where", K(ret), K(*stmt_));
} else if (OB_FAIL(print_order_by())) {
LOG_WARN("fail to print order by", K(ret), K(*stmt_));
} else if (OB_FAIL(print_limit())) {
LOG_WARN("fail to print limit", K(ret), K(*stmt_));
} else if (OB_FAIL(print_returning())) {
LOG_WARN("fail to print_returning", K(ret), K(*stmt_));
} else {
// do-nothing
}
return ret;
}
int ObUpdateStmtPrinter::print_update()
{
int ret = OB_SUCCESS;
if (OB_ISNULL(stmt_) || OB_ISNULL(buf_) || OB_ISNULL(pos_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stmt_ is NULL or buf_ is NULL or pos_ is NULL", K(ret));
} else if (!stmt_->is_update_stmt()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("Not a valid update stmt", K(stmt_->get_stmt_type()), K(ret));
} else {
DATA_PRINTF("update ");
if (OB_SUCC(ret)) {
if (OB_FAIL(print_hint())) { // hint
LOG_WARN("fail to print hint", K(ret), K(*stmt_));
}
}
}
return ret;
}
int ObUpdateStmtPrinter::print_set()
{
int ret = OB_SUCCESS;
if (OB_ISNULL(stmt_) || OB_ISNULL(buf_) || OB_ISNULL(pos_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("stmt_ is NULL or buf_ is NULL or pos_ is NULL", K(ret));
} else if (!stmt_->is_update_stmt()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("Not a valid update stmt", K(stmt_->get_stmt_type()), K(ret));
} else {
DATA_PRINTF(" set ");
if (OB_SUCC(ret)) {
const ObUpdateStmt* update_stmt = static_cast<const ObUpdateStmt*>(stmt_);
for (int64_t i = 0; OB_SUCC(ret) && i < update_stmt->get_tables_assignments().count(); ++i) {
for (int64_t j = 0; OB_SUCC(ret) && j < update_stmt->get_tables_assignments().at(i).assignments_.count(); ++j) {
const ObAssignment& assign = update_stmt->get_tables_assignments().at(i).assignments_.at(j);
// (c1, c2) = select x1, x2 from ... is represented as
// c1 = alias(subquery, 0), c2 = alias(subquery, 1)
ObAliasRefRawExpr* alias = NULL;
if (OB_ISNULL(assign.column_expr_) || OB_ISNULL(assign.expr_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("column expr is null", K(ret), K(assign.column_expr_), K(assign.expr_));
} else if (assign.is_implicit_) {
continue;
} else if (OB_FAIL(ObRawExprUtils::find_alias_expr(assign.expr_, alias))) {
LOG_WARN("failed to find alias expr", K(ret));
} else if (alias == NULL) {
if (OB_FAIL(print_simple_assign(assign))) {
LOG_WARN("failed to print simple assign expr", K(ret));
} else {
DATA_PRINTF(",");
}
} else if (alias->get_project_index() == 0) {
if (OB_FAIL(print_vector_assign(update_stmt->get_tables_assignments().at(i), alias->get_param_expr(0)))) {
LOG_WARN("failed to print vector assign", K(ret));
} else if (OB_SUCC(ret)) {
DATA_PRINTF(",");
}
}
}
if (OB_SUCC(ret)) {
--*pos_;
}
}
}
}
return ret;
}
int ObUpdateStmtPrinter::print_simple_assign(const ObAssignment& assign)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(assign.expr_) || OB_ISNULL(assign.column_expr_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("assign is invalid", K(ret), K(assign.expr_), K(assign.column_expr_));
} else if (OB_FAIL(expr_printer_.do_print(assign.column_expr_, T_FIELD_LIST_SCOPE))) {
LOG_WARN("fail to print target column", K(ret));
} else {
DATA_PRINTF(" = ");
}
if (OB_SUCC(ret)) {
ObRawExpr* tmp_expr = NULL;
if (OB_FAIL(ObRawExprUtils::erase_inner_added_exprs(assign.expr_, tmp_expr))) {
LOG_WARN("erase inner cast expr failed", K(ret));
} else if (OB_ISNULL(tmp_expr)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("expr is null");
} else if (OB_FAIL(expr_printer_.do_print(tmp_expr, T_FIELD_LIST_SCOPE))) {
LOG_WARN("fail to print select expr", K(ret));
}
}
return ret;
}
int ObUpdateStmtPrinter::print_vector_assign(const ObTableAssignment& assignments, ObRawExpr* query_ref_expr)
{
int ret = OB_SUCCESS;
ObSelectStmt* stmt = NULL;
ObSEArray<ObRawExpr*, 4> left_columns;
if (OB_ISNULL(query_ref_expr) || OB_UNLIKELY(!query_ref_expr->is_query_ref_expr()) ||
OB_ISNULL(stmt = static_cast<ObQueryRefRawExpr*>(query_ref_expr)->get_ref_stmt())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("query ref expr is null", K(ret), K(query_ref_expr), K(stmt));
} else if (OB_FAIL(left_columns.prepare_allocate(stmt->get_select_item_size()))) {
LOG_WARN("failed to prepare allocate select item size", K(ret));
}
for (int64_t i = 0; OB_SUCC(ret) && i < assignments.assignments_.count(); ++i) {
ObColumnRefRawExpr* col = NULL;
ObRawExpr* value_expr = NULL;
ObAliasRefRawExpr* alias = NULL;
if (OB_ISNULL(value_expr = assignments.assignments_.at(i).expr_) ||
OB_ISNULL(col = assignments.assignments_.at(i).column_expr_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("value expr is null", K(ret), K(col), K(value_expr));
} else if (col->is_generated_column()) {
// skip
} else if (OB_FAIL(ObRawExprUtils::find_alias_expr(value_expr, alias))) {
LOG_WARN("failed to find alias expr", K(ret));
} else if (alias == NULL) {
// do nothing
} else if (alias->get_param_expr(0) == query_ref_expr) {
int64_t idx = alias->get_project_index();
if (OB_UNLIKELY(idx < 0 || idx >= left_columns.count())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("index is invalid", K(ret), K(idx));
} else {
left_columns.at(idx) = col;
}
}
}
for (int64_t i = 0; OB_SUCC(ret) && i < left_columns.count(); ++i) {
DATA_PRINTF("%c", (i == 0 ? '(' : ' '));
if (OB_SUCC(ret)) {
if (OB_FAIL(expr_printer_.do_print(left_columns.at(i), T_FIELD_LIST_SCOPE))) {
LOG_WARN("fail to print target column", K(ret));
} else {
DATA_PRINTF("%c", (i == left_columns.count() - 1 ? ')' : ','));
}
}
}
if (OB_SUCC(ret)) {
DATA_PRINTF(" = ");
}
if (OB_SUCC(ret)) {
if (OB_FAIL(expr_printer_.do_print(query_ref_expr, T_FIELD_LIST_SCOPE))) {
LOG_WARN("failed to print query ref expr", K(ret));
}
}
return ret;
}
} // end of namespace sql
} // end of namespace oceanbase
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