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[FEAT MERGE]4_1_sql_feature

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Co-authored-by: leslieyuchen <leslieyuchen@gmail.com>
Co-authored-by: Charles0429 <xiezhenjiang@gmail.com>
Co-authored-by: raywill <hustos@gmail.com>
This commit is contained in:
obdev
2023-01-28 16:01:26 +08:00
committed by ob-robot
parent 3080f2b66f
commit 2d19a9d8f5
846 changed files with 161957 additions and 116661 deletions
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485
src/sql/ob_dml_stmt_printer.cpp
View File

@ -18,25 +18,13 @@
#include "common/ob_smart_call.h"
#include "lib/charset/ob_charset.h"
#include "sql/optimizer/ob_log_plan.h"
#include "sql/monitor/ob_sql_plan.h"
namespace oceanbase
{
using namespace common;
namespace sql
{
ObDMLStmtPrinter::ObDMLStmtPrinter()
: buf_(NULL),
buf_len_(0),
pos_(NULL),
stmt_(NULL),
schema_guard_(NULL),
print_params_(),
expr_printer_(),
param_store_(NULL),
is_inited_(false)
{
}
ObDMLStmtPrinter::ObDMLStmtPrinter(char *buf, int64_t buf_len, int64_t *pos, const ObDMLStmt *stmt,
ObSchemaGetterGuard *schema_guard,
ObObjPrintParams print_params,
@ -45,11 +33,11 @@ ObDMLStmtPrinter::ObDMLStmtPrinter(char *buf, int64_t buf_len, int64_t *pos, con
buf_len_(buf_len),
pos_(pos),
stmt_(stmt),
is_root_(false),
schema_guard_(schema_guard),
print_params_(print_params),
expr_printer_(),
param_store_(param_store),
is_inited_(true)
param_store_(param_store)
{
}
@ -63,7 +51,10 @@ void ObDMLStmtPrinter::init(char *buf, int64_t buf_len, int64_t *pos, ObDMLStmt
buf_len_ = buf_len;
pos_ = pos;
stmt_ = stmt;
is_inited_ = true;
print_params_.print_with_cte_ = true; // default true
// force print with cte regardless of the value of print_with_cte_
// this flag is not final solution, will be optimized later
print_params_.force_print_cte_ = false;
}
int ObDMLStmtPrinter::print_hint()
@ -79,16 +70,18 @@ int ObDMLStmtPrinter::print_hint()
if (OB_SUCC(ret)) {
const ObQueryHint &query_hint = stmt_->get_query_ctx()->get_query_hint();
// just for print hint, ExplainType set as invalid type
planText plan_text(buf_, buf_len_, ExplainType::EXPLAIN_UNINITIALIZED);
plan_text.pos = *pos_;
PlanText plan_text;
plan_text.buf_ = buf_;
plan_text.buf_len_ = buf_len_;
plan_text.pos_ = *pos_;
plan_text.is_oneline_ = true;
if (OB_FAIL(query_hint.print_stmt_hint(plan_text, *stmt_))) {
if (OB_FAIL(query_hint.print_stmt_hint(plan_text, *stmt_, is_root_))) {
LOG_WARN("failed to print stmt hint", K(ret));
} else if (plan_text.pos == *pos_) {
} else if (plan_text.pos_ == *pos_) {
// no hint, roolback buffer!
*pos_ -= strlen(hint_begin);
} else {
*pos_ = plan_text.pos;
*pos_ = plan_text.pos_;
DATA_PRINTF("%s", hint_end);
}
}
@ -138,13 +131,17 @@ int ObDMLStmtPrinter::print_from(bool need_from)
// in oracle mode
DATA_PRINTF(" from DUAL");
}
if (OB_SUCC(ret)) {
if (OB_FAIL(print_semi_info())) {
LOG_WARN("failed to print semi info", K(ret));
}
}
}
return ret;
}
int ObDMLStmtPrinter::print_table(const TableItem *table_item,
bool expand_cte_table,
bool no_print_alias/*default false*/)
{
int ret = OB_SUCCESS;
@ -170,8 +167,9 @@ int ObDMLStmtPrinter::print_table(const TableItem *table_item,
LOG_WARN("failed to print base table", K(ret), K(*table_item));
//table in insert all can't print alias(bug:https://work.aone.alibaba-inc.com/issue/31941210)
} else if (!no_print_alias) {
DATA_PRINTF(lib::is_oracle_mode() ? " \"%.*s\"" : " `%.*s`",
LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT_WITH_SPACE;
DATA_PRINTF("%.*s", LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT;
}
break;
}
@ -211,11 +209,11 @@ int ObDMLStmtPrinter::print_table(const TableItem *table_item,
break;
}
case INNER_JOIN: {
if (join_table->join_conditions_.count() == 0) {//cross join
type_str = "cross join";
} else {
type_str = "join";
}
type_str = "join";
break;
}
case CONNECT_BY_JOIN: {
type_str = "connect by join";
break;
}
default: {
@ -240,7 +238,7 @@ int ObDMLStmtPrinter::print_table(const TableItem *table_item,
join_table->join_conditions_;
int64_t join_conditions_size = join_conditions.count();
if (join_conditions_size > 0) {
DATA_PRINTF(" on (");
DATA_PRINTF(" on ");
for (int64_t i = 0; OB_SUCC(ret) && i < join_conditions_size;
++i) {
if (OB_FAIL(expr_printer_.do_print(join_conditions.at(i), T_NONE_SCOPE))) {
@ -250,8 +248,9 @@ int ObDMLStmtPrinter::print_table(const TableItem *table_item,
}
if (OB_SUCC(ret)) {
*pos_ -= 5; // strlen(" and ")
DATA_PRINTF(")");
}
} else {
DATA_PRINTF(" on 1=1 ");
}
DATA_PRINTF(")");
}
@ -273,53 +272,32 @@ int ObDMLStmtPrinter::print_table(const TableItem *table_item,
DATA_PRINTF(" %.*s", LEN_AND_PTR(table_item->alias_name_));
}
}
} else if (!expand_cte_table && table_item->cte_type_ != TableItem::NOT_CTE) {
} else if (table_item->cte_type_ != TableItem::NOT_CTE) {
DATA_PRINTF(" %.*s", LEN_AND_PTR(table_item->table_name_));
if (table_item->alias_name_.length() > 0) {
DATA_PRINTF(" %.*s", LEN_AND_PTR(table_item->alias_name_));
}
} else {
// 这里打印生成表是为了方便OB内部使用, 如rewrite调试用
bool print_bracket = ! expand_cte_table || table_item->ref_query_->is_root_stmt();
if (print_bracket) {
DATA_PRINTF("(");
}
if (OB_SUCC(ret)) {
ObIArray<ObString> *column_list = NULL;
bool is_set_subquery = false;
bool is_generated_table = true;
// force print alias name for select item in generated table. Otherwise,
// create view v as select 1 from dual where 1 > (select `abs(c1)` from (select abs(c1) from t));
// Definition of v would be:
// CREATE VIEW `v` AS select 1 AS `1` from DUAL where (1 > (select `abs(c1)` from ((select abs(`test`.`t`.`c1`) from `test`.`t`)) ))
// `abs(c1)` would be an unknown column.
const bool force_col_alias = stmt_->is_select_stmt();
ObSelectStmtPrinter stmt_printer(buf_, buf_len_, pos_,
static_cast<ObSelectStmt*>(table_item->ref_query_),
schema_guard_,
print_params_,
column_list,
is_set_subquery,
is_generated_table,
force_col_alias);
if (OB_FAIL(stmt_printer.do_print())) {
LOG_WARN("fail to print generated table", K(ret));
}
if (print_bracket) {
DATA_PRINTF(")");
}
if (table_item->cte_type_ == TableItem::NOT_CTE) {
DATA_PRINTF(" %.*s", LEN_AND_PTR(table_item->alias_name_));
}
// force print alias name for select item in generated table. Otherwise,
// create view v as select 1 from dual where 1 > (select `abs(c1)` from (select abs(c1) from t));
// Definition of v would be:
// CREATE VIEW `v` AS select 1 AS `1` from DUAL where (1 > (select `abs(c1)` from ((select abs(`test`.`t`.`c1`) from `test`.`t`)) ))
// `abs(c1)` would be an unknown column.
if (OB_FAIL(print_inline_view(table_item->ref_query_,
true,
true))) {
LOG_WARN("failed to print subquery", K(ret));
}
DATA_PRINTF(" %.*s", LEN_AND_PTR(table_item->table_name_));
}
break;
}
case TableItem::CTE_TABLE: {
PRINT_TABLE_NAME(table_item);
if (! table_item->alias_name_.empty()) {
DATA_PRINTF(lib::is_oracle_mode() ? " \"%.*s\"" : " `%.*s`",
LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT_WITH_SPACE;
DATA_PRINTF("%.*s", LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT;
}
break;
}
@ -328,7 +306,9 @@ int ObDMLStmtPrinter::print_table(const TableItem *table_item,
DATA_PRINTF("TABLE(");
OZ (expr_printer_.do_print(table_item->function_table_expr_, T_FROM_SCOPE));
DATA_PRINTF(")");
DATA_PRINTF(" \"%.*s\"", LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT_WITH_SPACE;
DATA_PRINTF("%.*s", LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT;
break;
}
case TableItem::JSON_TABLE: {
@ -343,8 +323,9 @@ int ObDMLStmtPrinter::print_table(const TableItem *table_item,
case TableItem::TEMP_TABLE: {
PRINT_TABLE_NAME(table_item);
if (! table_item->alias_name_.empty()) {
DATA_PRINTF(lib::is_oracle_mode() ? " \"%.*s\"" : " `%.*s`",
LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT_WITH_SPACE;
DATA_PRINTF("%.*s", LEN_AND_PTR(table_item->alias_name_));
PRINT_QUOT;
}
break;
}
@ -917,6 +898,79 @@ int ObDMLStmtPrinter::print_base_table(const TableItem *table_item)
return ret;
}
int ObDMLStmtPrinter::print_semi_info()
{
int ret = OB_SUCCESS;
if (OB_ISNULL(stmt_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null stmt", K(ret));
}
for (int i = 0; OB_SUCC(ret) && i < stmt_->get_semi_info_size(); ++i) {
SemiInfo *semi_info = stmt_->get_semi_infos().at(i);
const TableItem *right_table = NULL;
if (OB_ISNULL(semi_info)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null semi info", K(ret));
} else if (OB_ISNULL(right_table = stmt_->get_table_item_by_id(semi_info->right_table_id_))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null table item", K(ret));
} else {
DATA_PRINTF(", ");
// join type
ObString type_str("");
switch (semi_info->join_type_) {
case LEFT_SEMI_JOIN: {
type_str = "left semi join";
break;
}
case RIGHT_SEMI_JOIN: {
type_str = "right semi join";
break;
}
case LEFT_ANTI_JOIN: {
type_str = "left anti join";
break;
}
case RIGHT_ANTI_JOIN: {
type_str = "right anti join";
break;
}
default: {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unknown join type", K(ret));
break;
}
}
DATA_PRINTF(" %.*s ", LEN_AND_PTR(type_str));
// right table
if (OB_SUCC(ret)) {
if (OB_FAIL(print_table(right_table))) {
LOG_WARN("fail to print right table", K(ret), K(*right_table));
} else {
// join conditions
const ObIArray<ObRawExpr*> &join_conditions = semi_info->semi_conditions_;
int64_t join_conditions_size = join_conditions.count();
if (join_conditions_size > 0) {
DATA_PRINTF(" on ");
for (int64_t i = 0; OB_SUCC(ret) && i < join_conditions_size; ++i) {
if (OB_FAIL(expr_printer_.do_print(join_conditions.at(i), T_NONE_SCOPE))) {
LOG_WARN("fail to print join condition", K(ret));
}
DATA_PRINTF(" and ");
}
if (OB_SUCC(ret)) {
*pos_ -= 5; // strlen(" and ")
}
} else {
DATA_PRINTF(" on 1=1 ");
}
}
}
}
}
return ret;
}
int ObDMLStmtPrinter::print_where()
{
int ret = OB_SUCCESS;
@ -1093,6 +1147,299 @@ int ObDMLStmtPrinter::print_returning()
return ret;
}
int ObDMLStmtPrinter::print_inline_view(const ObSelectStmt *subselect_stmt,
bool print_bracket,
const bool force_col_alias)
{
int ret = OB_SUCCESS;
ObSelectStmtPrinter printer(buf_, buf_len_, pos_,
subselect_stmt,
schema_guard_,
print_params_,
force_col_alias);
if (print_bracket) {
DATA_PRINTF("(");
}
printer.disable_print_cte();
if (OB_FAIL(printer.do_print())) {
LOG_WARN("failed to print sub select printer", K(ret));
}
if (print_bracket) {
DATA_PRINTF(")");
}
return ret;
}
int ObDMLStmtPrinter::print_cte_define()
{
int ret = OB_SUCCESS;
ObSEArray<ObDMLStmt::TempTableInfo, 8> temp_table_infos;
if (print_params_.print_origin_stmt_) {
//do nothing
} else if (OB_ISNULL(stmt_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null stmt", K(ret));
} else if (OB_FAIL(const_cast<ObDMLStmt*>(stmt_)->collect_temp_table_infos(temp_table_infos))) {
LOG_WARN("failed to collect temp table infos", K(ret));
} else if (temp_table_infos.empty()) {
//do nothing
} else {
DATA_PRINTF(is_oracle_mode() ? "WITH " : "WITH RECURSIVE ");
for(int64_t i = 0; OB_SUCC(ret) && i < temp_table_infos.count(); ++i) {
if (temp_table_infos.at(i).table_items_.empty()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("the cte tableitem can not be empty", K(ret));
} else {
TableItem *cte_table = temp_table_infos.at(i).table_items_.at(0);
if (OB_ISNULL(cte_table)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null table item", K(ret));
} else if (OB_FAIL(print_cte_define_title(cte_table))) {
LOG_WARN("print column name failed", K(ret));
} else if (OB_FAIL(print_inline_view(cte_table->ref_query_, true))) {
LOG_WARN("print table failed", K(ret));
} else if (OB_FAIL(print_search_and_cycle(cte_table->ref_query_))) {
LOG_WARN("print search and cycle failed", K(ret));
}
}
//打印尾巴
if (OB_FAIL(ret)) {
//do nothing
} else if (i == temp_table_infos.count() - 1) {
DATA_PRINTF(" ");
} else {
DATA_PRINTF(", ");
}
}
}
return ret;
}
int ObDMLStmtPrinter::print_cte_define_title(TableItem* cte_table)
{
int ret = OB_SUCCESS;
//递归cte一定是定义了别名列表的
//打印cte的表一定不要打印库名?
//DATA_PRINTF(" %.*s)", LEN_AND_PTR(cte_table->table_name_));
//cte在mysql中定义和使用是，不允许类似 db.cte_name这种使用方法，打印的时候我们
//不能打印database name
ObSelectStmt *sub_select_stmt = NULL;
PRINT_TABLE_NAME(cte_table);
if (OB_ISNULL(cte_table) || OB_ISNULL(sub_select_stmt = cte_table->ref_query_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null params", K(ret));
} else if (OB_NOT_NULL(cte_table->node_) && OB_NOT_NULL(cte_table->node_->children_[1])) {
DATA_PRINTF("(");
const ObIArray<SelectItem> &sub_select_items = sub_select_stmt->get_select_items();
//打印列
for (int64_t i = 0; i < sub_select_items.count() && OB_SUCC(ret); ++i) {
if (T_CTE_SEARCH_COLUMN == sub_select_items.at(i).expr_->get_expr_type()
|| T_CTE_CYCLE_COLUMN == sub_select_items.at(i).expr_->get_expr_type()) {
//伪列不需要打印出来
} else {
PRINT_QUOT;
DATA_PRINTF("%.*s", LEN_AND_PTR(sub_select_items.at(i).alias_name_));
PRINT_QUOT;
if (i != sub_select_items.count() - 1
&& T_CTE_SEARCH_COLUMN != sub_select_items.at(i+1).expr_->get_expr_type()
&& T_CTE_CYCLE_COLUMN != sub_select_items.at(i+1).expr_->get_expr_type()) {
DATA_PRINTF(", ");
}
}
}
DATA_PRINTF(")");
}
if (OB_SUCC(ret)) {
DATA_PRINTF(" as ");
}
return ret;
}
int ObDMLStmtPrinter::print_cte_define_title(const ObSelectStmt *sub_select_stmt)
{
int ret = OB_SUCCESS;
if (OB_ISNULL(sub_select_stmt)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null params", K(ret));
} else {
DATA_PRINTF("(");
const ObIArray<SelectItem> &sub_select_items = sub_select_stmt->get_select_items();
//打印列
for (int64_t i = 0; i < sub_select_items.count() && OB_SUCC(ret); ++i) {
if (T_CTE_SEARCH_COLUMN == sub_select_items.at(i).expr_->get_expr_type()
|| T_CTE_CYCLE_COLUMN == sub_select_items.at(i).expr_->get_expr_type()) {
//伪列不需要打印出来
} else {
PRINT_QUOT;
DATA_PRINTF("%.*s", LEN_AND_PTR(sub_select_items.at(i).alias_name_));
PRINT_QUOT;
if (i != sub_select_items.count() - 1
&& T_CTE_SEARCH_COLUMN != sub_select_items.at(i+1).expr_->get_expr_type()
&& T_CTE_CYCLE_COLUMN != sub_select_items.at(i+1).expr_->get_expr_type()) {
DATA_PRINTF(", ");
}
}
}
DATA_PRINTF(")");
}
if (OB_SUCC(ret)) {
DATA_PRINTF(" as ");
}
return ret;
}
int ObDMLStmtPrinter::print_search_and_cycle(const ObSelectStmt *sub_select_stmt)
{
int ret = OB_SUCCESS;
ObArenaAllocator allocator("PrintSelectStmt");
if (OB_ISNULL(sub_select_stmt)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("the cte table must have ref sub query", K(ret));
} else {
const ObIArray<SelectItem> &sub_select_items = sub_select_stmt->get_select_items();
const ObIArray<OrderItem> &search_items = sub_select_stmt->get_search_by_items();
if (!search_items.empty()) {
DATA_PRINTF(" search ");
if (sub_select_stmt->is_breadth_search()) {
DATA_PRINTF("breadth first by ");
} else {
DATA_PRINTF("depth first by ");
}
}
for (int64_t i = 0; i < search_items.count() && OB_SUCC(ret); ++i) {
allocator.reuse();
ObString column_name = ((ObColumnRefRawExpr*)(search_items.at(i).expr_))->get_column_name();
CONVERT_CHARSET_FOR_RPINT(allocator, column_name);
PRINT_QUOT;
DATA_PRINTF("%.*s", LEN_AND_PTR(column_name));
PRINT_QUOT;
if (lib::is_mysql_mode()) {
if (is_descending_direction(search_items.at(i).order_type_)) {
DATA_PRINTF("DESC ");
}
} else if (search_items.at(i).order_type_ == NULLS_FIRST_ASC) {
DATA_PRINTF("ASC NULLS FIRST ");
} else if (search_items.at(i).order_type_ == NULLS_LAST_ASC) {//use default value
/*do nothing*/
} else if (search_items.at(i).order_type_ == NULLS_FIRST_DESC) {//use default value
DATA_PRINTF("DESC ");
} else if (search_items.at(i).order_type_== NULLS_LAST_DESC) {
DATA_PRINTF("DESC NULLS LAST ");
}
if (i != search_items.count() - 1) {
DATA_PRINTF(", ");
} else {
DATA_PRINTF(" ");
}
}
for (int64_t i = 0; i < sub_select_items.count() && OB_SUCC(ret); ++i) {
if (T_CTE_SEARCH_COLUMN == sub_select_items.at(i).expr_->get_expr_type()) {
DATA_PRINTF("set ");
PRINT_QUOT;
DATA_PRINTF("%.*s", LEN_AND_PTR(sub_select_items.at(i).alias_name_));
PRINT_QUOT;
}
}
const ObIArray<ColumnItem> &cycle_items = sub_select_stmt->get_cycle_items();
if (!cycle_items.empty()) {
DATA_PRINTF("cycle ");
}
for (int64_t i = 0; i < cycle_items.count() && OB_SUCC(ret); ++i) {
allocator.reuse();
ObString column_name = ((ObColumnRefRawExpr*)(cycle_items.at(i).expr_))->get_column_name();
CONVERT_CHARSET_FOR_RPINT(allocator, column_name);
PRINT_QUOT;
DATA_PRINTF("%.*s", LEN_AND_PTR(column_name));
PRINT_QUOT;
if (i != cycle_items.count() - 1) {
DATA_PRINTF(", ");
} else {
DATA_PRINTF(" ");
}
}
for (int64_t i = 0; i < sub_select_items.count() && OB_SUCC(ret); ++i) {
if (T_CTE_CYCLE_COLUMN == sub_select_items.at(i).expr_->get_expr_type()) {
ObRawExpr *v;
ObRawExpr *d_v;
DATA_PRINTF("set ");
PRINT_QUOT;
DATA_PRINTF("%.*s", LEN_AND_PTR(sub_select_items.at(i).alias_name_));
PRINT_QUOT;
DATA_PRINTF("to ");
((ObPseudoColumnRawExpr*)(sub_select_items.at(i).expr_))->get_cte_cycle_value(v, d_v);
if (OB_ISNULL(v)
|| OB_ISNULL(d_v)
|| !v->is_const_raw_expr()
|| !d_v->is_const_raw_expr()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("Unexpected const expr", K(ret), KPC(v), KPC(d_v));
} else {
ObObj non_cycle_vale = ((ObConstRawExpr*)v)->get_value();
ObObj cycle_vale = ((ObConstRawExpr*)d_v)->get_value();
DATA_PRINTF("'%.*s' ", LEN_AND_PTR(non_cycle_vale.get_string()));
DATA_PRINTF("default ");
DATA_PRINTF("'%.*s' ", LEN_AND_PTR(cycle_vale.get_string()));
}
}
}
}
return ret;
}
//把cte的定义完整的恢复出来
int ObDMLStmtPrinter::print_with()
{
int ret = OB_SUCCESS;
if (OB_ISNULL(stmt_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpect null stmt", K(ret));
} else if (!print_params_.print_origin_stmt_) {
//do nothing
} else if (stmt_->get_cte_definition_size() == 0) {
// don't print
} else {
const ObIArray<TableItem *> &cte_tables = stmt_->get_cte_definitions();
DATA_PRINTF(is_oracle_mode() ? "WITH " : "WITH RECURSIVE ");
//恢复定义，cte先放本stmt中T_WITH_CLAUSE产生的的cte，再放parent放过来的
for (int64_t i = 0; OB_SUCC(ret) && i < cte_tables.count() && OB_SUCC(ret); i++) {
TableItem* cte_table = cte_tables.at(i);
//打印定义
if (OB_ISNULL(cte_table)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("the cte tableitem can not be null", K(ret));
} else if (TableItem::NORMAL_CTE == cte_table->cte_type_
|| TableItem::RECURSIVE_CTE == cte_table->cte_type_) {
if (OB_FAIL(print_cte_define_title(cte_table))) {
LOG_WARN("print column name failed", K(ret));
} else if (OB_FAIL(print_inline_view(cte_table->ref_query_, true, true))) {
LOG_WARN("print table failed", K(ret));
} else if (OB_FAIL(print_search_and_cycle(cte_table->ref_query_))) {
LOG_WARN("print search and cycle failed", K(ret));
}
} else {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected cte type", K(ret), K(cte_table->cte_type_));
}
//打印尾巴
if (OB_FAIL(ret)) {
//do nothing
} else if (i == cte_tables.count() - 1) {
DATA_PRINTF(" ");
} else {
DATA_PRINTF(", ");
}
}
}
return ret;
}
} //end of namespace sql
} //end of namespace oceanbase