308 lines
10 KiB
C++
308 lines
10 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_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_json_func_helper.h"
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#include "sql/session/ob_sql_session_info.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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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(ObExprResType &type,
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ObExprResType *types_stack,
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int64_t param_num,
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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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int ObExprOr::calc_res_with_one_param_null(common::ObObj &res,
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const common::ObObj &left,
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const common::ObObj &right,
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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" 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, ObDatum &res)
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{
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int ret = OB_SUCCESS;
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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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return ret;
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}
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// 特殊处理：
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// 1. select null or ''; -> or结果为0
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// 原因：针对select语句，cast_mode会自动加上WARN_ON_FAIL，所以空串转为number时，
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// 结果为0，错误码被覆盖，上述语句就会返回0
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// 2. create table t1 as (select null or ''); -> or的结果为NULL
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// 原因：针对非select/explain语句，cast_mode没有WARN_ON_FAIL，所以上面空串转number时，
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// 报OB_ERR_TRUNCATED_WRONG_VALUE_FOR_FIELD，但是为了兼容MySQL，这里会进行特殊处理，
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// 将错误码覆盖，并且or的结果为NULL而非0
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//
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// 上面说的针对空串的特殊处理都是针对MySQL的，因为Oracle模式下or两边的子节点都必须是有
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// 布尔语义的表达式，不会直接是空串
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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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if (OB_FAIL(expr.args_[0]->eval(ctx, tmp_res))) {
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LOG_WARN("eval arg 0 failed", K(ret));
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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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LOG_WARN("eval arg failed", K(ret), K(i));
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}
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if (OB_SUCC(ret)) {
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if (OB_FAIL(calc_or_expr2(res_datum, *child_res, 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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}
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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,
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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",
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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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rt_expr.eval_batch_func_ = eval_or_batch_exprN;
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}
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return ret;
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}
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int ObExprOr::eval_or_batch_exprN(const ObExpr &expr, ObEvalCtx &ctx,
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const ObBitVector &skip, const int64_t batch_size)
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{
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LOG_DEBUG("eval or batch mode", K(batch_size));
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int ret = OB_SUCCESS;
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ObDatum *results = expr.locate_batch_datums(ctx);
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if (OB_ISNULL(results)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("expr results frame is not init", K(ret));
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} else {
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ObBitVector &eval_flags = expr.get_evaluated_flags(ctx);
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ObBitVector &my_skip = expr.get_pvt_skip(ctx);
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my_skip.deep_copy(skip, batch_size);
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const int64_t real_param = batch_size - my_skip.accumulate_bit_cnt(batch_size);
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int64_t skip_cnt = 0; //记录一个batch中skip的数量， 所有参数被skip即可结束
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/*为省略对results的初始化操作以及减少对my_skip的写入，分成3段求值
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*args_[first]需要设置eval flags， 设置初始值， 为true设置skip
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*args_[middle]需要设置非false的result， 为true设置skip
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*args_[last]只需要设置非false的result*/
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//eval first
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if (real_param == skip_cnt) {
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} else if (OB_FAIL(expr.args_[0]->eval_batch(ctx, my_skip, batch_size))) {
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LOG_WARN("failed to eval batch result args0", K(ret));
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} else if (expr.args_[0]->is_batch_result()) {
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ObDatum *curr_datum = nullptr;
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ObDatum *datum_array = expr.args_[0]->locate_batch_datums(ctx);
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for (int64_t j = 0; OB_SUCC(ret) && j < batch_size; ++j) {
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if (my_skip.at(j)) {
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continue;
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}
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curr_datum = &datum_array[j];
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if (curr_datum->is_null()) {
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results[j].set_null();
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} else if (true == curr_datum->get_bool()) {
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results[j].set_bool(true);
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my_skip.set(j);
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} else {
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results[j].set_bool(false);
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}
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eval_flags.set(j);
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}
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} else {
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ObDatum *curr_datum = &expr.args_[0]->locate_expr_datum(ctx);
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for (int64_t j = 0; OB_SUCC(ret) && j < batch_size; ++j) {
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if (my_skip.at(j)) {
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continue;
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}
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if (curr_datum->is_null()) {
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results[j].set_null();
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} else if (true == curr_datum->get_bool()) {
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results[j].set_bool(true);
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my_skip.set(j);
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} else {
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results[j].set_bool(false);
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}
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eval_flags.set(j);
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}
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}
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//eval middle
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int64_t arg_idx = 1;
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for (; OB_SUCC(ret) && arg_idx < expr.arg_cnt_ - 1 && skip_cnt < real_param; ++arg_idx) {
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if (OB_FAIL(expr.args_[arg_idx]->eval_batch(ctx, my_skip, batch_size))) {
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LOG_WARN("failed to eval batch result", K(ret), K(arg_idx));
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} else if (expr.args_[arg_idx]->is_batch_result()) {
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ObDatum *curr_datum = nullptr;
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ObDatum *datum_array = expr.args_[arg_idx]->locate_batch_datums(ctx);
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for (int64_t j = 0; OB_SUCC(ret) && j < batch_size; ++j) {
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if (my_skip.at(j)) {
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continue;
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}
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curr_datum = &datum_array[j];
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if (curr_datum->is_null()) {
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results[j].set_null();
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} else if (true == curr_datum->get_bool()) {
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results[j].set_bool(true);
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my_skip.set(j);
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} else {
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//do nothing
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}
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}
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} else {
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ObDatum *curr_datum = &expr.args_[arg_idx]->locate_expr_datum(ctx);
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for (int64_t j = 0; OB_SUCC(ret) && j < batch_size; ++j) {
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if (my_skip.at(j)) {
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continue;
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}
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if (curr_datum->is_null()) {
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results[j].set_null();
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} else if (true == curr_datum->get_bool()) {
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results[j].set_bool(true);
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my_skip.set(j);
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} else {
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//do nothing
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}
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}
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}
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}
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//eval last
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if (OB_FAIL(ret)) {
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} else if (real_param == skip_cnt) {
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} else if (OB_FAIL(expr.args_[arg_idx]->eval_batch(ctx, my_skip, batch_size))) {
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LOG_WARN("failed to eval batch result args0", K(ret));
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} else if (expr.args_[arg_idx]->is_batch_result()) {
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ObDatum *curr_datum = nullptr;
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ObDatum *datum_array = expr.args_[arg_idx]->locate_batch_datums(ctx);
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for (int64_t j = 0; OB_SUCC(ret) && j < batch_size; ++j) {
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if (my_skip.at(j)) {
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continue;
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}
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curr_datum = &datum_array[j];
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if (curr_datum->is_null()) {
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results[j].set_null();
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} else if (true == curr_datum->get_bool()) {
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results[j].set_bool(true);
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} else {
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//do nothing
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}
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}
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} else {
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ObDatum *curr_datum = &expr.args_[arg_idx]->locate_expr_datum(ctx);
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for (int64_t j = 0; OB_SUCC(ret) && j < batch_size; ++j) {
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if (my_skip.at(j)) {
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continue;
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}
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if (curr_datum->is_null()) {
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results[j].set_null();
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} else if (true == curr_datum->get_bool()) {
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results[j].set_bool(true);
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} else {
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//do nothing
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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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}
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}
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