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2021-05-31 22:56:52 +08:00
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src/sql/engine/expr/ob_expr_and.cpp Normal file
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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_ENG
#include "sql/engine/expr/ob_expr_and.h"
#include "lib/oblog/ob_log.h"
#include "share/object/ob_obj_cast.h"
#include "common/object/ob_obj_compare.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/resolver/expr/ob_raw_expr_deduce_type.h"
namespace oceanbase {
using namespace common;
namespace sql {
ObExprAnd::ObExprAnd(ObIAllocator& alloc)
: ObLogicalExprOperator(alloc, T_OP_AND, N_AND, PARAM_NUM_UNKNOWN, NOT_ROW_DIMENSION)
{
param_lazy_eval_ = true;
};
int ObExprAnd::calc_result_typeN(
ObExprResType& type, ObExprResType* types_stack, int64_t param_num, ObExprTypeCtx& type_ctx) const
{
UNUSED(type_ctx);
UNUSED(types_stack);
UNUSED(param_num);
int ret = OB_SUCCESS;
type.set_type(ObInt32Type);
type.set_precision(DEFAULT_PRECISION_FOR_BOOL);
type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
return ret;
}
// expect obj1 and obj2 already evaluated
int ObExprAnd::calc_result2(
common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
bool obj1_is_true = false;
EXPR_SET_CAST_CTX_MODE(expr_ctx);
if (OB_FAIL(ObLogicalExprOperator::is_true(obj1, expr_ctx.cast_mode_ | CM_NO_RANGE_CHECK, obj1_is_true))) {
LOG_WARN("fail to evaluate obj1", K(obj1), K(ret));
} else if (!obj1.is_null() && !obj1_is_true) { // obj1 is false
result.set_int32(static_cast<int32_t>(false));
} else {
if (OB_UNLIKELY(obj1.is_null() && obj2.is_null())) {
result.set_null();
} else if (OB_UNLIKELY(obj1.is_null())) {
ret = cacl_res_with_one_param_null(result, obj1, obj2, expr_ctx);
} else if (OB_UNLIKELY(obj2.is_null())) {
ret = cacl_res_with_one_param_null(result, obj2, obj1, expr_ctx);
} else {
// obj1 must be true here.
bool bool_v2 = false;
if (OB_FAIL(ObLogicalExprOperator::is_true(obj2, expr_ctx.cast_mode_ | CM_NO_RANGE_CHECK, bool_v2))) {
LOG_WARN("fail to evaluate obj2", K(obj2), K(ret));
} else {
result.set_int32(static_cast<int32_t>(bool_v2));
}
}
}
return ret;
}
int ObExprAnd::calc_resultN(ObObj& result, const ObObj* objs, int64_t param_num, ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (OB_ISNULL(objs) || OB_UNLIKELY(1 >= param_num)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid arguments", K(ret), K(objs), K(param_num));
} else if (OB_FAIL(param_eval(expr_ctx, objs[0], 0))) {
LOG_WARN("failed: eval objs[0]", K(ret));
} else {
result = objs[0];
if (result.is_false()) {
result.set_int32(static_cast<int32_t>(false));
}
for (int64_t idx = 1; idx < param_num && OB_SUCCESS == ret && !result.is_false(); ++idx) {
if (OB_FAIL(param_eval(expr_ctx, objs[idx], idx))) {
LOG_WARN("failed: eval objs[idx]", K(idx), K(ret));
} else {
ret = calc_result2(result, result, objs[idx], expr_ctx);
}
}
}
return ret;
}
int ObExprAnd::cacl_res_with_one_param_null(
common::ObObj& res, const common::ObObj& left, const common::ObObj& right, common::ObExprCtx& expr_ctx)
{
int ret = OB_SUCCESS;
if (OB_UNLIKELY((!left.is_null()) || right.is_null())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected params", K(ret), K(left), K(right));
} else {
// left is null while right is not null. evaluate the right obj
bool value = false;
EXPR_SET_CAST_CTX_MODE(expr_ctx);
if (OB_FAIL(ObObjEvaluator::is_true(right, expr_ctx.cast_mode_ | CM_NO_RANGE_CHECK, value))) {
LOG_WARN("fail to evaluate obj1", K(right), K(ret));
// By design, compatible with mysql and oracle:
// null and false == false. null and true == null.
// see "NULL and the three-valued logic"
// https://en.wikipedia.org/wiki/Null_(SQL)#Comparisons_with_NULL_and_the_three-valued_logic_(3VL)
} else if (value) {
res.set_null();
} else {
res.set_int32(static_cast<int32_t>(false));
}
}
return ret;
}
static int calc_and_expr2(const ObDatum& left, const ObDatum& right, ObDatum& res)
{
int ret = OB_SUCCESS;
if (left.is_false() || right.is_false()) {
res.set_false();
} else if (left.is_null() || right.is_null()) {
res.set_null();
} else {
res.set_true();
}
return ret;
}
int calc_and_exprN(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
{
int ret = OB_SUCCESS;
ObDatum* tmp_res = NULL;
ObDatum* child_res = NULL;
if (OB_FAIL(expr.args_[0]->eval(ctx, tmp_res))) {
LOG_WARN("eval arg 0 failed", K(ret));
} else if (tmp_res->is_null()) {
res_datum.set_null();
} else {
res_datum.set_bool(tmp_res->get_bool());
}
if (OB_SUCC(ret) && !res_datum.is_false()) {
for (int64_t i = 1; OB_SUCC(ret) && i < expr.arg_cnt_; ++i) {
if (OB_FAIL(expr.args_[i]->eval(ctx, child_res))) {
LOG_WARN("eval arg failed", K(ret), K(i));
} else if (OB_FAIL(calc_and_expr2(res_datum, *child_res, res_datum))) {
LOG_WARN("calc_and_expr2 failed", K(ret), K(i));
} else if (res_datum.is_false()) {
break;
}
}
}
return ret;
}
int ObExprAnd::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(expr_cg_ctx);
if (OB_ISNULL(rt_expr.args_) || OB_UNLIKELY(2 > rt_expr.arg_cnt_) ||
OB_UNLIKELY(rt_expr.arg_cnt_ != raw_expr.get_param_count())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("args_ is NULL or arg_cnt_ is invalid or raw_expr is invalid", K(ret), K(rt_expr), K(raw_expr));
} else {
rt_expr.eval_func_ = calc_and_exprN;
}
return ret;
}
} // namespace sql
} // namespace oceanbase