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src/sql/engine/expr/ob_expr_case.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_case.h"
#include "sql/engine/expr/ob_expr_operator.h"
//#include "sql/engine/expr/ob_expr_promotion_util.h"
#include "sql/session/ob_sql_session_info.h"
namespace oceanbase {
using namespace common;
namespace sql {
typedef int (*CheckIsMatchFunc)(const ObDatum* when_datum, bool& match_when);
ObExprCase::ObExprCase(ObIAllocator& alloc) : ObExprOperator(alloc, T_OP_CASE, N_CASE, MORE_THAN_ONE, NOT_ROW_DIMENSION)
{
disable_operand_auto_cast();
param_lazy_eval_ = true;
}
ObExprCase::~ObExprCase()
{}
// param_num include then/else expr, exclude when expr.
int ObExprCase::calc_result_typeN(
ObExprResType& type, ObExprResType* types_stack, int64_t param_num, ObExprTypeCtx& type_ctx) const
{
// case
// when 10 then expr1
// when 11 then expr2
// [else expr3]
int ret = OB_SUCCESS;
if (OB_ISNULL(types_stack)) {
LOG_WARN("null types");
ret = OB_INVALID_ARGUMENT;
} else if (OB_UNLIKELY(param_num < 3 || param_num % 2 == 0)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("param num is not correct", K(param_num));
} else { // param_num >=3 and param_num is odd
/* in order to be compatible with mysql
* both in ob_expr_cae.cpp and ob_expr_arg_case.cpp
* types_stack includes the condition exprs.
* In expr_case, there is no arg param expr compared with expr_arg_case
*/
const int64_t cond_type_count = param_num / 2;
const int64_t val_type_count = param_num - cond_type_count;
const ObLengthSemantics default_length_semantics =
(OB_NOT_NULL(type_ctx.get_session()) ? type_ctx.get_session()->get_actual_nls_length_semantics() : LS_BYTE);
if (OB_FAIL(aggregate_result_type_for_case(type,
types_stack + cond_type_count,
val_type_count,
type_ctx.get_coll_type(),
lib::is_oracle_mode(),
default_length_semantics,
type_ctx.get_session()))) {
LOG_WARN("failed to aggregate result type");
} else {
ObExprOperator::calc_result_flagN(type, types_stack + cond_type_count, val_type_count);
}
const ObSQLSessionInfo* session = dynamic_cast<const ObSQLSessionInfo*>(type_ctx.get_session());
if (OB_ISNULL(session)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("cast basic session to sql session info failed", K(ret));
} else if (session->use_static_typing_engine()) {
for (int64_t i = 0; i < cond_type_count; ++i) {
const ObObjType cond_type = types_stack[i].get_type();
const ObObjTypeClass cond_tc = ob_obj_type_class(cond_type);
if (ObIntTC == cond_tc || ObUIntTC == cond_tc || ObNumberTC == cond_tc || ObNullTC == cond_tc) {
types_stack[i].set_calc_type(cond_type);
types_stack[i].set_calc_collation(types_stack[i]);
} else {
types_stack[i].set_calc_type(ObDoubleType);
types_stack[i].set_calc_collation_type(CS_TYPE_BINARY);
types_stack[i].set_calc_collation_level(CS_LEVEL_NUMERIC);
}
}
bool is_expr_integer_type = (ob_is_int_tc(type.get_type()) || ob_is_uint_tc(type.get_type()));
for (int64_t i = cond_type_count; OB_SUCC(ret) && i < param_num; ++i) {
bool is_arg_integer_type =
(ob_is_int_tc(types_stack[i].get_type()) || ob_is_uint_tc(types_stack[i].get_type()));
if ((is_arg_integer_type && is_expr_integer_type) || ObNullType == types_stack[i].get_type()) {
// see ObExprCoalesce::calc_result_typeN
types_stack[i].set_calc_meta(types_stack[i].get_obj_meta());
} else {
types_stack[i].set_calc_meta(type.get_obj_meta());
}
}
}
}
return ret;
}
int ObExprCase::calc_resultN(ObObj& result, const ObObj* objs_stack, int64_t param_num, ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (OB_ISNULL(expr_ctx.calc_buf_)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("expr_ctx.calc_buf is null", K(expr_ctx.calc_buf_));
} else {
ret = calc(result, objs_stack, param_num, result_type_, expr_ctx);
}
return ret;
}
// Case expr support parameter lazy evaluation, param_eval() must called
// before access object in %objs_stack,
int ObExprCase::calc(ObObj& result, const ObObj* objs_stack, int64_t param_num, const ObExprResType& expected_type,
ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
bool match_when = false;
ObObj tmp_result;
int64_t i = 0;
if (OB_ISNULL(objs_stack)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("null stack", K(objs_stack));
} else if (OB_UNLIKELY(param_num < 2)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("no enough param", K(param_num));
} else {
const bool has_else = (param_num % 2 != 0);
int64_t loop = (has_else) ? param_num - 1 : param_num;
double double_v = 0;
bool bool_v = false;
EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
for (i = 0; OB_SUCC(ret) && !match_when && i < loop; i += 2) {
if (OB_FAIL(param_eval(expr_ctx, objs_stack[i], i))) {
LOG_WARN("parameter evaluate failed", K(ret), K(i));
} else {
ObObjType type = objs_stack[i].get_type();
if (ObNullType != type) {
if (ob_is_int_tc(type)) {
bool_v = (objs_stack[i].get_int() != 0);
} else if (ob_is_uint_tc(type) || ob_is_enumset_tc(type)) {
bool_v = (objs_stack[i].get_uint64() != 0);
} else if (ob_is_number_tc(type)) {
bool_v = !(objs_stack[i].get_number().is_zero());
} else {
EXPR_GET_DOUBLE_V2(objs_stack[i], double_v);
if (OB_FAIL(ret)) {
LOG_WARN("fail cast obj to tinyint", K(objs_stack[i]), K(ret));
} else {
bool_v = (double_v >= DOUBLE_TRUE_VALUE_THRESHOLD || double_v <= -DOUBLE_TRUE_VALUE_THRESHOLD);
}
}
if (bool_v) { // no need to test ret here
if (OB_FAIL(param_eval(expr_ctx, objs_stack[i + 1], i + 1))) {
LOG_WARN("parameter evaluate failed", K(ret), K(i + 1));
} else {
tmp_result = objs_stack[i + 1];
match_when = true;
LOG_DEBUG("match", K(tmp_result));
}
}
}
}
} // end for
if (OB_SUCC(ret)) {
if (!match_when) {
if (has_else) {
if (OB_FAIL(param_eval(expr_ctx, objs_stack[param_num - 1], param_num - 1))) {
LOG_WARN("parameter evaluate failed", K(ret), K(param_num - 1));
} else {
tmp_result = objs_stack[param_num - 1]; // match else
}
} else {
tmp_result.set_null();
}
}
if (OB_SUCC(ret)) {
if (tmp_result.is_null()) {
result.set_null();
} else {
if (ob_is_string_or_lob_type(result_type_.get_type())) {
cast_ctx.dest_collation_ = result_type_.get_collation_type();
}
if (OB_FAIL(ObObjCaster::to_type(expected_type.get_type(), cast_ctx, tmp_result, result))) {
LOG_WARN("fail cast obj", K(expected_type.get_type()), K(tmp_result), K(ret));
}
}
}
} // end set result
}
return ret;
}
int ObExprCase::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(op_cg_ctx);
const ObCaseOpRawExpr& case_expr = dynamic_cast<const ObCaseOpRawExpr&>(raw_expr);
// when expr must return int/null because it must be bool expr.
for (int64_t i = 0; OB_SUCC(ret) && i < case_expr.get_when_expr_size(); ++i) {
const ObRawExpr* when_expr = case_expr.get_when_param_expr(i);
const ObObjType& when_expr_res_type = when_expr->get_result_type().get_type();
if (OB_UNLIKELY(ObNullType != when_expr_res_type && !ob_is_integer_type(when_expr_res_type))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("when expr must return integer", K(ret), K(when_expr_res_type));
}
}
if (OB_SUCC(ret)) {
rt_expr.eval_func_ = calc_case_expr;
}
return ret;
}
static int check_is_match(const ObDatum& when_datum, bool& match_when)
{
int ret = OB_SUCCESS;
if (when_datum.is_null()) {
match_when = false;
} else {
int64_t v = when_datum.get_int();
match_when = (v != 0) ? true : false;
}
return ret;
}
int ObExprCase::calc_case_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
{
int ret = OB_SUCCESS;
const bool has_else = (expr.arg_cnt_ % 2 != 0);
int64_t loop = (has_else) ? expr.arg_cnt_ - 1 : expr.arg_cnt_;
bool match_when = false;
ObDatum* when_datum = NULL;
ObDatum* then_datum = NULL;
bool has_result = false;
int64_t expr_idx = 0;
for (; OB_SUCC(ret) && !match_when && expr_idx < loop; expr_idx += 2) {
if (OB_FAIL(expr.args_[expr_idx]->eval(ctx, when_datum))) {
LOG_WARN("eval when expr failed", K(ret), K(expr_idx));
} else if (OB_FAIL(check_is_match(*when_datum, match_when))) {
LOG_WARN("check is when expr match failed", K(ret), K(expr_idx));
} else if (match_when) {
if (OB_FAIL(expr.args_[expr_idx + 1]->eval(ctx, then_datum))) {
LOG_WARN("eval then expr failed", K(ret), K(expr_idx + 1));
} else {
has_result = true;
}
}
}
if (OB_SUCC(ret)) {
if (!match_when) {
if (has_else) {
if (OB_FAIL(expr.args_[expr.arg_cnt_ - 1]->eval(ctx, then_datum))) {
LOG_WARN("eval else expr failed for case when", K(ret));
} else {
has_result = true;
}
}
}
}
if (OB_SUCC(ret)) {
if (!has_result) {
res_datum.set_null();
} else {
if (OB_ISNULL(then_datum)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("then_datum is NULL", K(ret));
} else {
res_datum.set_datum(*then_datum);
}
}
}
return ret;
}
int ObExprCase::is_same_kind_type_for_case(const ObIArray<ObExprResType>& type_arr)
{
int ret = OB_SUCCESS;
if (OB_SUCC(ret)) {
bool match = false;
int64_t first_not_null_idx = OB_INVALID_ID;
for (int64_t i = 0; OB_SUCC(ret) && OB_INVALID_ID == first_not_null_idx && i < type_arr.count(); ++i) {
if (!ob_is_null(type_arr.at(i).get_type())) {
first_not_null_idx = i;
}
}
first_not_null_idx = OB_INVALID_ID == first_not_null_idx ? 0 : first_not_null_idx;
const ObExprResType& res_type = type_arr.at(first_not_null_idx);
for (int64_t i = first_not_null_idx + 1; OB_SUCC(ret) && i < type_arr.count(); ++i) {
if (OB_FAIL(ObExprOperator::is_same_kind_type_for_case(res_type, type_arr.at(i), match))) {
LOG_WARN("fail to judge same type", K(i), K(res_type), K(type_arr.at(i)), K(ret));
} else if (!match) {
ret = OB_ERR_INVALID_TYPE_FOR_OP;
LOG_WARN("fail to judge same type", K(i), K(res_type), K(type_arr.at(i)), K(ret));
}
}
}
return ret;
}
} // namespace sql
} // namespace oceanbase