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oceanbase/src/sql/engine/basic/ob_function_table_op.cpp

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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/basic/ob_function_table_op.h"
#include "share/object/ob_obj_cast.h"
#include "common/sql_mode/ob_sql_mode_utils.h"
#include "sql/ob_sql_utils.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/ob_physical_plan.h"
#include "sql/engine/ob_exec_context.h"
#include "pl/ob_pl_user_type.h"
#include "sql/engine/expr/ob_expr.h"
#include "sql/engine/expr/ob_expr_lob_utils.h"
namespace oceanbase
{
using namespace common;
namespace sql
{
OB_SERIALIZE_MEMBER((ObFunctionTableSpec, ObOpSpec), value_expr_, column_exprs_, has_correlated_expr_);
int ObFunctionTableOp::inner_open()
{
int ret = OB_SUCCESS;
node_idx_ = 0;
already_calc_ = false;
if (OB_ISNULL(MY_SPEC.value_expr_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("value expr is not init", K(ret));
} else if (ObExtendType == MY_SPEC.value_expr_->datum_meta_.type_) {
next_row_func_ = &ObFunctionTableOp::inner_get_next_row_udf;
} else {
next_row_func_ = &ObFunctionTableOp::inner_get_next_row_sys_func;
}
return ret;
}
int ObFunctionTableOp::inner_rescan()
{
int ret = OB_SUCCESS;
if (OB_FAIL(ObOperator::inner_rescan())) {
LOG_WARN("failed to inner rescan", K(ret));
} else {
node_idx_ = 0;
if (MY_SPEC.has_correlated_expr_) {
row_count_ = 0;
col_count_ = 0;
value_table_ = NULL;
already_calc_ = false;
}
}
return ret;
}
int ObFunctionTableOp::inner_close()
{
int ret = OB_SUCCESS;
node_idx_ = 0;
row_count_ = 0;
col_count_ = 0;
value_table_ = NULL;
return ret;
}
//ObFunctionTableOp has its own switch_iterator
int ObFunctionTableOp::switch_iterator()
{
int ret = OB_SUCCESS;
if (OB_FAIL(ObOperator::inner_switch_iterator())) {
LOG_WARN("failed to switch iterator", K(ret));
} else if (OB_ISNULL(ctx_.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to get session", K(ret));
} else if (NULL == ctx_.get_my_session()->get_pl_implicit_cursor()
|| !ctx_.get_my_session()->get_pl_implicit_cursor()->get_in_forall()) {
ret = OB_ITER_END;
} else {
node_idx_ = 0;
}
return ret;
}
void ObFunctionTableOp::destroy()
{
ObOperator::destroy();
}
int ObFunctionTableOp::get_current_result(ObObj &result)
{
int ret = OB_SUCCESS;
void *data = NULL;
CK (already_calc_);
if (node_idx_ < 0 || node_idx_ >= row_count_ * col_count_) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("fail to get current result in table function",
K(node_idx_), K(row_count_), K(col_count_));
}
do {
CK (node_idx_ >= 0);
if (OB_SUCC(ret) && node_idx_ >= row_count_) {
ret = OB_ITER_END;
}
CK (OB_NOT_NULL(value_table_));
OX (data = value_table_->get_data());
CK (OB_NOT_NULL(data));
OX (result = (static_cast<ObObj*>(data))[node_idx_++]);
} while (OB_SUCC(ret) && result.get_meta().get_type() == ObMaxType);
return ret;
}
int ObFunctionTableOp::inner_get_next_row()
{
return (this->*next_row_func_)();
}
int ObFunctionTableOp::inner_get_next_row_udf()
{
int ret = OB_SUCCESS;
ObPhysicalPlanCtx *plan_ctx = nullptr;
clear_evaluated_flag();
if (OB_ISNULL(plan_ctx = ctx_.get_physical_plan_ctx())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to get plan ctx", K(ret), K(plan_ctx));
} else if (OB_ISNULL(MY_SPEC.value_expr_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("value expr is not init", K(ret));
} else if (ObExtendType != MY_SPEC.value_expr_->datum_meta_.type_) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected value", K(ret), K(MY_SPEC.value_expr_->datum_meta_.type_));
} else if (FALSE_IT(plan_ctx->set_autoinc_id_tmp(0))) {
} else if (OB_FAIL(ctx_.check_status())) {
LOG_WARN("failed to check status ", K(ret));
} else {
ObDatum *value = nullptr;
if (!already_calc_) {
if (OB_FAIL(MY_SPEC.value_expr_->eval(eval_ctx_, value))) {
LOG_WARN("failed to eval value expr", K(ret));
} else if (value->is_null()) {
//do nothing
} else if (OB_ISNULL(value_table_
= reinterpret_cast<pl::ObPLCollection*>(value->get_ext()))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to get value table", K(ret));
} else {
row_count_ = value_table_->is_inited() ? value_table_->get_count() : 0;
col_count_ = value_table_->get_column_count();
}
already_calc_ = true;
}
if (OB_SUCC(ret) && OB_UNLIKELY(node_idx_ >= row_count_)) {
ret = OB_ITER_END;
}
CK (MY_SPEC.column_exprs_.count() >= col_count_);
ObObj obj_stack[col_count_];
if (OB_SUCC(ret)) {
if (nullptr != value_table_
&& ObExtendType == value_table_->get_element_type().get_obj_type()) {
pl::ObPLComposite *composite = NULL;
pl::ObPLRecord *record = NULL;
ObObj record_obj;
OZ (get_current_result(record_obj));
if (OB_SUCC(ret) && record_obj.is_pl_extend()) {
CK (OB_NOT_NULL(composite = reinterpret_cast<pl::ObPLComposite*>(record_obj.get_ext())));
CK (composite->is_record());
OX (record = static_cast<pl::ObPLRecord*>(composite));
CK (record->get_count() == col_count_);
for (int64_t i = 0; OB_SUCC(ret) && i < col_count_; ++i) {
OZ (record->get_element(i, obj_stack[i]));
}
} else {
ret = OB_ERR_UNEXPECTED;
LOG_ERROR("unexpected here", K(ret), K(record_obj), K(record_obj.meta_));
}
} else {
for (int64_t i = 0; OB_SUCC(ret) && i < col_count_; ++i) {
if (OB_FAIL(get_current_result(obj_stack[i]))) {
LOG_WARN("failed to get current result", K(ret), K(i));
}
}
}
}
if (OB_SUCC(ret)) {
for (int64_t i = 0; OB_SUCC(ret) && i < col_count_; ++i) {
if (obj_stack[i].is_null()) {
MY_SPEC.column_exprs_.at(i)->locate_datum_for_write(eval_ctx_).set_null();
} else {
const ObObjDatumMapType &datum_map = MY_SPEC.column_exprs_.at(i)->obj_datum_map_;
ObExpr * const &expr = MY_SPEC.column_exprs_.at(i);
ObDatum &datum = expr->locate_datum_for_write(eval_ctx_);
if (OB_FAIL(datum.from_obj(obj_stack[i], datum_map))) {
LOG_WARN("failed to convert datum", K(ret));
} else if (is_lob_storage(obj_stack[i].get_type()) &&
OB_FAIL(ob_adjust_lob_datum(obj_stack[i], expr->obj_meta_, datum_map,
get_exec_ctx().get_allocator(), datum))) {
LOG_WARN("adjust lob datum failed", K(ret), K(obj_stack[i].get_meta()), K(expr->obj_meta_));
}
}
if (OB_SUCC(ret)) {
MY_SPEC.column_exprs_.at(i)->set_evaluated_projected(eval_ctx_);
}
}
}
}
return ret;
}
int ObFunctionTableOp::inner_get_next_row_sys_func()
{
int ret = OB_SUCCESS;
ObPhysicalPlanCtx *plan_ctx = nullptr;
ObDatum *value = nullptr;
clear_evaluated_flag();
if (OB_ISNULL(plan_ctx = ctx_.get_physical_plan_ctx())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("failed to get plan ctx", K(ret), K(plan_ctx));
} else if (OB_FAIL(ctx_.check_status())) {
LOG_WARN("failed to check status ", K(ret));
} else if (OB_FAIL(MY_SPEC.value_expr_->eval(eval_ctx_, value))) {
if (OB_ITER_END != ret) {
LOG_WARN("failed to eval value expr", K(ret));
}
} else {
MY_SPEC.column_exprs_.at(0)->locate_datum_for_write(eval_ctx_).set_datum(*value);
MY_SPEC.column_exprs_.at(0)->set_evaluated_projected(eval_ctx_);
}
return ret;
}
} // end namespace sql
} // end namespace oceanbase
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