210 lines
7.4 KiB
C++
210 lines
7.4 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#define USING_LOG_PREFIX SQL
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#include "ob_merge_stmt_printer.h"
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#include "sql/resolver/expr/ob_raw_expr_util.h"
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using namespace oceanbase::sql;
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using namespace oceanbase::common;
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void ObMergeStmtPrinter::init(char *buf, int64_t buf_len, int64_t *pos, ObMergeStmt *stmt)
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{
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ObDMLStmtPrinter::init(buf, buf_len, pos, stmt);
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}
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int ObMergeStmtPrinter::do_print()
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{
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int ret = OB_SUCCESS;
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if (OB_UNLIKELY(!is_inited_)) {
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ret = OB_NOT_INIT;
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LOG_WARN("not inited!", K(ret));
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} else if (OB_ISNULL(stmt_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("stmt should not be NULL", K(ret));
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} else {
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expr_printer_.init(buf_, buf_len_, pos_, print_params_);
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if (OB_FAIL(print())) {
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LOG_WARN("fail to print stmt", K(ret));
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}
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}
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return ret;
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}
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// merge into target using source on match_condition update clause insert_clause
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int ObMergeStmtPrinter::print()
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(stmt_) || OB_ISNULL(buf_) || OB_ISNULL(pos_) ||
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OB_UNLIKELY(!stmt_->is_merge_stmt())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("stmt_ is NULL or buf_ is NULL or pos_ is NULL", K(ret),
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K(stmt_), K(buf_), K(pos_));
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} else {
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const ObMergeStmt *merge_stmt = static_cast<const ObMergeStmt *>(stmt_);
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const TableItem *target_table = NULL;
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const TableItem *source_table = NULL;
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const ObIArray<ObRawExpr *> &match_conds = merge_stmt->get_match_condition_exprs();
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if (OB_ISNULL(target_table = merge_stmt->get_table_item_by_id(
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merge_stmt->get_target_table_id())) ||
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OB_ISNULL(source_table = merge_stmt->get_table_item_by_id(
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merge_stmt->get_source_table_id()))) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("target table or source table is null",
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K(ret), K(target_table), K(source_table));
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}
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DATA_PRINTF("merge ");
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if (OB_SUCC(ret) && print_hint()) {
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LOG_WARN("failed to print hint", K(ret));
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}
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DATA_PRINTF("into ");
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if (OB_SUCC(ret) && print_table(target_table)) {
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LOG_WARN("failed to print target table", K(ret));
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}
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DATA_PRINTF(" using ");
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if (OB_SUCC(ret) && print_table(source_table)) {
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LOG_WARN("failed to print source table", K(ret));
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}
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DATA_PRINTF(" on ( ");
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if (OB_SUCC(ret) && print_conds(match_conds)) {
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LOG_WARN("failed to print match conditions", K(ret));
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}
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DATA_PRINTF(" )");
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if (OB_SUCC(ret) && merge_stmt->has_update_clause()) {
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if (OB_FAIL(print_update_clause(*merge_stmt))) {
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LOG_WARN("failed to print update clause", K(ret));
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}
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}
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if (OB_SUCC(ret) && merge_stmt->has_insert_clause()) {
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if (OB_FAIL(print_insert_clause(*merge_stmt))) {
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LOG_WARN("failed to print insert clause", K(ret));
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}
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}
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}
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return ret;
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}
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int ObMergeStmtPrinter::print_conds(const ObIArray<ObRawExpr *> &conds)
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{
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int ret = OB_SUCCESS;
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for (int64_t i = 0; OB_SUCC(ret) && i < conds.count(); ++i) {
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if (OB_FAIL(expr_printer_.do_print(conds.at(i), T_NONE_SCOPE))) {
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LOG_WARN("failed to print match condition", K(ret));
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} else if (i < conds.count() - 1) {
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DATA_PRINTF(" and ");
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}
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}
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return ret;
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}
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int ObMergeStmtPrinter::print_update_clause(const ObMergeStmt &merge_stmt)
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{
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int ret = OB_SUCCESS;
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bool first_assign = true;
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const ObIArray<ObRawExpr *> &update_conds = merge_stmt.get_update_condition_exprs();
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const ObIArray<ObRawExpr *> &delete_conds = merge_stmt.get_delete_condition_exprs();
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const common::ObIArray<ObAssignment> &assignments = merge_stmt.get_table_assignments();
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if (OB_UNLIKELY(assignments.empty())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("update clause does not have assignments", K(ret));
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}
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DATA_PRINTF(" when matched then");
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if (OB_SUCC(ret)) {
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// has update assign
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DATA_PRINTF(" update set ");
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for (int64_t i = 0; OB_SUCC(ret) && i < assignments.count(); ++i) {
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const ObAssignment &assign = assignments.at(i);
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ObColumnRefRawExpr *column = assign.column_expr_;
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ObRawExpr *value = assign.expr_;
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ObRawExpr *real_value = NULL;
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if (OB_ISNULL(column) || OB_ISNULL(value)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid column assign", K(ret));
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} else if (!assign.is_implicit_) {
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if (!first_assign) {
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DATA_PRINTF(", ");
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} else {
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first_assign = false;
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}
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if (OB_SUCC(ret)) {
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if (OB_FAIL(expr_printer_.do_print(column, T_UPDATE_SCOPE))) {
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LOG_WARN("failed to print assign target", K(ret));
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} else {
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DATA_PRINTF(" = ");
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}
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}
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if (OB_SUCC(ret)) {
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if (OB_FAIL(ObRawExprUtils::erase_inner_added_exprs(value, real_value))) {
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LOG_WARN("failed to erase inner case expr", K(ret));
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} else if (OB_FAIL(expr_printer_.do_print(real_value, T_UPDATE_SCOPE))) {
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LOG_WARN("failed to print assign value", K(ret));
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}
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}
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}
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}
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}
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if (OB_SUCC(ret) && !update_conds.empty()) {
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DATA_PRINTF(" where ");
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if (OB_SUCC(ret) && print_conds(update_conds)) {
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LOG_WARN("failed to print update conditions", K(ret));
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}
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}
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if (OB_SUCC(ret) && !delete_conds.empty()) {
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DATA_PRINTF(" delete where ");
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if (OB_SUCC(ret) && print_conds(delete_conds)) {
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LOG_WARN("failed to print conditions", K(ret));
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}
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}
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return ret;
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}
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int ObMergeStmtPrinter::print_insert_clause(const ObMergeStmt &merge_stmt)
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{
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int ret = OB_SUCCESS;
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int64_t column_count = merge_stmt.get_values_desc().count();
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int64_t value_count = merge_stmt.get_values_vector().count();
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ObArenaAllocator allocator("PrintMergeStmt");
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const ObIArray<ObRawExpr *> &insert_conds = merge_stmt.get_insert_condition_exprs();
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if (OB_UNLIKELY(column_count != value_count)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("column count does not equal with value count",
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K(ret), K(column_count), K(value_count));
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}
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DATA_PRINTF(" when not matched then insert (");
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for (int64_t i = 0; OB_SUCC(ret) && i < column_count; ++i) {
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const ObColumnRefRawExpr* column = merge_stmt.get_values_desc().at(i);
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if (OB_ISNULL(column)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("column is NULL", K(ret));
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} else {
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ObString column_name = column->get_column_name();
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CONVERT_CHARSET_FOR_RPINT(allocator, column_name);
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DATA_PRINTF(" %.*s %c", LEN_AND_PTR(column_name),
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(i < column_count - 1 ? ',' : ')'));
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}
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}
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DATA_PRINTF(" values (");
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for (int64_t i = 0; OB_SUCC(ret) && i < value_count; ++i) {
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DATA_PRINTF(" ");
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if (OB_FAIL(expr_printer_.do_print(merge_stmt.get_values_vector().at(i), T_INSERT_SCOPE))) {
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LOG_WARN("fail to print value expr", K(ret));
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}
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DATA_PRINTF(" %c", i < value_count - 1 ? ',' : ')');
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}
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if (OB_SUCC(ret) && !insert_conds.empty()) {
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DATA_PRINTF(" where ");
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if (OB_SUCC(ret) && print_conds(insert_conds)) {
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LOG_WARN("failed to print conditions", K(ret));
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}
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}
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return ret;
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}
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