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src/sql/engine/expr/ob_expr_or.cpp
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242
src/sql/engine/expr/ob_expr_or.cpp
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/**
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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_ENG
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#include "sql/engine/expr/ob_expr_or.h"
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#include "lib/oblog/ob_log.h"
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#include "share/object/ob_obj_cast.h"
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//#include "sql/engine/expr/ob_expr_promotion_util.h"
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#include "sql/session/ob_sql_session_info.h"
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namespace oceanbase {
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using namespace common;
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namespace sql {
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ObExprOr::ObExprOr(ObIAllocator& alloc)
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: ObLogicalExprOperator(alloc, T_OP_OR, N_OR, PARAM_NUM_UNKNOWN, NOT_ROW_DIMENSION)
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{
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param_lazy_eval_ = true;
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}
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int ObExprOr::calc_result_typeN(
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ObExprResType& type, ObExprResType* types_stack, int64_t param_num, ObExprTypeCtx& type_ctx) const
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{
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UNUSED(type_ctx);
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UNUSED(types_stack);
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UNUSED(param_num);
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int ret = OB_SUCCESS;
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// just keep enumset as origin
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type.set_int32();
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type.set_precision(DEFAULT_PRECISION_FOR_BOOL);
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type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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return ret;
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}
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// expect obj1 and obj2 already evaluated
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int ObExprOr::calc_result2(
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common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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bool obj1_is_true = false;
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EXPR_SET_CAST_CTX_MODE(expr_ctx);
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if (OB_FAIL(ObLogicalExprOperator::is_true(obj1, expr_ctx.cast_mode_ | CM_NO_RANGE_CHECK, obj1_is_true))) {
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LOG_WARN("fail to evaluate obj1", K(obj1), K(ret));
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} else if (obj1_is_true) {
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result.set_int32(static_cast<int32_t>(true));
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} else {
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if (OB_UNLIKELY(obj1.is_null() && obj2.is_null())) {
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result.set_null();
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} else if (OB_UNLIKELY(obj1.is_null())) {
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ret = cacl_res_with_one_param_null(result, obj1, obj2, expr_ctx);
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} else if (OB_UNLIKELY(obj2.is_null())) {
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ret = cacl_res_with_one_param_null(result, obj2, obj1, expr_ctx);
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} else {
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// obj1 must be false here.
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bool bool_v2 = false;
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if (OB_FAIL(ObLogicalExprOperator::is_true(obj2, expr_ctx.cast_mode_ | CM_NO_RANGE_CHECK, bool_v2))) {
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LOG_WARN("fail to evaluate obj2", K(obj2), K(ret));
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} else {
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result.set_int32(static_cast<int32_t>(bool_v2));
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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 ObExprOr::calc_resultN(ObObj& result, const ObObj* objs, int64_t param_num, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(objs) || OB_UNLIKELY(1 >= param_num)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid arguments", K(ret), K(objs), K(param_num));
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} else if (OB_FAIL(param_eval(expr_ctx, objs[0], 0))) {
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LOG_WARN("failed: eval objs[0]", K(ret));
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} else {
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result = objs[0];
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if (result.is_true()) {
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result.set_int32(static_cast<int32_t>(true));
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}
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for (int64_t idx = 1; idx < param_num && OB_SUCCESS == ret && !result.is_true(); ++idx) {
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if (OB_FAIL(param_eval(expr_ctx, objs[idx], idx))) {
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LOG_WARN("failed: eval objs[idx]", K(idx), K(ret));
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} else {
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ret = calc_result2(result, result, objs[idx], expr_ctx);
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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 ObExprOr::cacl_res_with_one_param_null(
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common::ObObj& res, const common::ObObj& left, const common::ObObj& right, common::ObExprCtx& expr_ctx)
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{
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int ret = OB_SUCCESS;
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if (OB_UNLIKELY((!left.is_null()) || right.is_null())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected params", K(ret), K(left), K(right));
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} else {
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// left is null while right is not null. evaluate the right obj
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bool value = false;
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EXPR_SET_CAST_CTX_MODE(expr_ctx);
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if (OB_FAIL(ObObjEvaluator::is_true(right, expr_ctx.cast_mode_ | CM_NO_RANGE_CHECK, value))) {
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LOG_WARN("fail to evaluate obj1", K(right), K(ret));
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// ugly. but compatible with mysql.
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if (OB_ERR_TRUNCATED_WRONG_VALUE_FOR_FIELD == ret) {
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ret = OB_SUCCESS;
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res.set_null();
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}
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// By design, compatible with mysql and oracle:
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// null or false == NULL. null or true == true.
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// see "NULL and the three-valued logic"
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// https://en.wikipedia.org/wiki/Null_(SQL)#Comparisons_with_NULL_and_the_three-valued_logic_(3VL)
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} else if (value) {
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res.set_int32(static_cast<int32_t>(true));
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} else {
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res.set_null();
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}
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}
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return ret;
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}
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// create table t1 as (select null or ''); -> NULL;
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// create table t1 as (select 1 or ''); -> 1;
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// create table t1 as (select 0 or ''); -> 0;
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static int calc_with_one_empty_str(const ObDatum& in_datum, ObDatum& out_datum)
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{
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int ret = OB_SUCCESS;
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if (in_datum.is_null()) {
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out_datum.set_null();
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} else {
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out_datum.set_bool(in_datum.get_bool());
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}
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return ret;
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}
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static int calc_or_expr2(const ObDatum& left, const ObDatum& right, const bool left_empty_str_cast_failed,
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const bool right_empty_str_cast_failed, ObDatum& res)
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{
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int ret = OB_SUCCESS;
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if (left_empty_str_cast_failed) {
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calc_with_one_empty_str(right, res);
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} else if (right_empty_str_cast_failed) {
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calc_with_one_empty_str(left, res);
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} else {
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if (left.is_true() || right.is_true()) {
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res.set_true();
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} else if (left.is_null() || right.is_null()) {
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res.set_null();
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} else {
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res.set_false();
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}
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}
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return ret;
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}
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// Special treatment:
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// 1. select null or''; -> or the result is 0
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// Reason: For the select statement, cast_mode will automatically add WARN_ON_FAIL,
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// so when the empty string is converted to number,
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// The result is 0, the error code is overwritten, the above statement will return 0
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// 2. create table t1 as (select null or''); -> the result of or is NULL
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// Reason: For non-select/explain statements, cast_mode does not have WARN_ON_FAIL,
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// so when the above empty string is converted to number,
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// Report OB_ERR_TRUNCATED_WRONG_VALUE_FOR_FIELD, but in order to be compatible with MySQL,
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// special processing will be carried out here,
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// Overwrite the error code, and the result of or is NULL instead of 0
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//
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// The special processing for empty strings mentioned above is for MySQL,
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// because the child nodes on both sides of or must be in Oracle mode
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// An expression with Boolean semantics will not be an empty string directly
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int calc_or_exprN(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum* tmp_res = NULL;
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ObDatum* child_res = NULL;
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bool left_empty_str_cast_failed = false;
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bool right_empty_str_cast_failed = false;
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if (OB_FAIL(expr.args_[0]->eval(ctx, tmp_res))) {
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// An empty string will fail to cast to number, which requires special handling
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if (OB_ERR_TRUNCATED_WRONG_VALUE_FOR_FIELD == ret) {
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ret = OB_SUCCESS;
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left_empty_str_cast_failed = true;
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} else {
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LOG_WARN("eval arg 0 failed", K(ret));
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}
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} else if (tmp_res->is_null()) {
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res_datum.set_null();
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} else {
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res_datum.set_bool(tmp_res->get_bool());
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}
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if (OB_SUCC(ret) && !res_datum.is_true()) {
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for (int64_t i = 1; OB_SUCC(ret) && i < expr.arg_cnt_; ++i) {
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if (OB_FAIL(expr.args_[i]->eval(ctx, child_res))) {
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if (OB_ERR_TRUNCATED_WRONG_VALUE_FOR_FIELD == ret) {
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ret = OB_SUCCESS;
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right_empty_str_cast_failed = true;
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} else {
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LOG_WARN("eval arg failed", K(ret), K(i));
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}
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}
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if (OB_SUCC(ret)) {
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if (OB_FAIL(calc_or_expr2(
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res_datum, *child_res, left_empty_str_cast_failed, right_empty_str_cast_failed, res_datum))) {
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LOG_WARN("calc_or_expr2 failed", K(ret), K(i));
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} else if (res_datum.is_true()) {
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break;
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} else {
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left_empty_str_cast_failed = false;
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right_empty_str_cast_failed = false;
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}
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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 ObExprOr::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_cg_ctx);
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if (OB_ISNULL(rt_expr.args_) || OB_UNLIKELY(2 > rt_expr.arg_cnt_) ||
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OB_UNLIKELY(rt_expr.arg_cnt_ != raw_expr.get_param_count())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("args_ is NULL or arg_cnt_ is invalid or raw_expr is invalid", K(ret), K(rt_expr), K(raw_expr));
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} else {
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rt_expr.eval_func_ = calc_or_exprN;
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}
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return ret;
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}
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} // namespace sql
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} // namespace oceanbase
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