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oceanbase/src/sql/engine/expr/ob_expr_xmlcast.cpp
obdev d2afa610a2 [CP] xml tenant memory leak
2023-09-20 17:01:21 +00:00

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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.
* This file is for func xmlcast.
*/
#include "ob_expr_xmlcast.h"
#include "share/object/ob_obj_cast.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/session/ob_sql_session_info.h"
#ifdef OB_BUILD_ORACLE_XML
#include "lib/xml/ob_xml_parser.h"
#include "lib/xml/ob_xml_tree.h"
#include "lib/xml/ob_xml_util.h"
#include "lib/xml/ob_xpath.h"
#include "sql/engine/expr/ob_expr_xml_func_helper.h"
#endif
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/ob_spi.h"
#define USING_LOG_PREFIX SQL_ENG
using namespace oceanbase::common;
namespace oceanbase
{
namespace sql
{
ObExprXmlcast::ObExprXmlcast(common::ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_XMLCAST, N_XMLCAST, 2, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
{
}
ObExprXmlcast::~ObExprXmlcast() {}
int ObExprXmlcast::calc_result_type2(ObExprResType &type,
ObExprResType &type1,
ObExprResType &type2,
common::ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
ObObjType xml_type = type1.get_type();
uint64_t subschema_id = type1.get_subschema_id();
if (!is_called_in_sql()) {
ret = OB_ERR_SP_LILABEL_MISMATCH;
LOG_WARN("expr call in pl semantics disallowed", K(ret), K(N_XMLCAST));
LOG_USER_ERROR(OB_ERR_SP_LILABEL_MISMATCH, static_cast<int>(strlen(N_XMLCAST)), N_XMLCAST);
} else if (type1.is_ext() && type1.get_udt_id() == T_OBJ_XML) {
type1.get_calc_meta().set_sql_udt(ObXMLSqlType);
} else if (!ob_is_xml_sql_type(xml_type, subschema_id)) {
ret = OB_ERR_INVALID_TYPE_FOR_OP;
LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_OP, "-", "-");
LOG_WARN("inconsistent datatypes", K(ret), K(ob_obj_type_str(xml_type)));
}
if (OB_FAIL(ret)) {
} else if (OB_FAIL(set_dest_type(type2, type, type_ctx))) {
LOG_WARN("fail to set return type", K(ret));
}
return ret;
}
int ObExprXmlcast::set_dest_type(ObExprResType &param_type, ObExprResType &dst_type, ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
const sql::ObSQLSessionInfo *session = type_ctx.get_session();
if (!param_type.is_int() && !param_type.get_param().is_int()) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("cast param type is unexpected", K(param_type));
} else {
const ObObj &param = param_type.get_param();
ParseNode node;
node.value_ = param.get_int();
ObObjType obj_type = static_cast<ObObjType>(node.int16_values_[OB_NODE_CAST_TYPE_IDX]);
ObCollationType cs_type = static_cast<ObCollationType>(node.int16_values_[OB_NODE_CAST_COLL_IDX]);
int64_t text_length = node.int32_values_[1];
ObObjTypeClass dest_tc = ob_obj_type_class(obj_type);
ObAccuracy accuracy;
// set obj_type
dst_type.set_type(obj_type);
dst_type.set_collation_type(cs_type);
// set cs_type
if (!ObCharset::is_valid_collation(cs_type)) {
ObCollationType collation_connection = type_ctx.get_coll_type();
ObCollationType collation_nation = session->get_nls_collation_nation();
// use collation of current session
dst_type.set_collation_type(ob_is_nstring_type(dst_type.get_type()) ?
collation_nation : collation_connection);
}
if (ob_is_string_or_lob_type(obj_type)) {
dst_type.set_collation_level(CS_LEVEL_IMPLICIT);
}
// set accuracy
if (ObStringTC == dest_tc) {
// parser will abort all negative number
// if length < 0 means DEFAULT_STR_LENGTH or OUT_OF_STR_LEN.
accuracy.set_full_length(node.int32_values_[1], param_type.get_accuracy().get_length_semantics(),
lib::is_oracle_mode());
} else if(ObTextTC == dest_tc) {
accuracy.set_length(ObAccuracy::DDL_DEFAULT_ACCURACY[obj_type].get_length());
} else if (ObIntervalTC == dest_tc) {
if (OB_UNLIKELY(!ObIntervalScaleUtil::scale_check(node.int16_values_[3]) ||
!ObIntervalScaleUtil::scale_check(node.int16_values_[2]))) {
ret = OB_ERR_DATETIME_INTERVAL_PRECISION_OUT_OF_RANGE;
} else {
ObScale scale = (obj_type == ObIntervalYMType) ?
ObIntervalScaleUtil::interval_ym_scale_to_ob_scale(
static_cast<int8_t>(node.int16_values_[3]))
: ObIntervalScaleUtil::interval_ds_scale_to_ob_scale(
static_cast<int8_t>(node.int16_values_[2]),
static_cast<int8_t>(node.int16_values_[3]));
accuracy.set_scale(scale);
}
} else {
const ObAccuracy &def_acc =
ObAccuracy::DDL_DEFAULT_ACCURACY2[lib::is_oracle_mode()][obj_type];
if (ObNumberType == obj_type && 0 == node.int16_values_[2]) {
accuracy.set_precision(def_acc.get_precision());
} else {
accuracy.set_precision(node.int16_values_[2]);
}
accuracy.set_scale(node.int16_values_[3]);
if (lib::is_oracle_mode() && ObDoubleType == obj_type) {
accuracy.set_accuracy(def_acc.get_precision());
}
}
dst_type.set_accuracy(accuracy);
}
return ret;
}
int ObExprXmlcast::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
{
UNUSED(expr_cg_ctx);
UNUSED(raw_expr);
rt_expr.eval_func_ = eval_xmlcast;
return OB_SUCCESS;
}
#ifdef OB_BUILD_ORACLE_XML
int ObExprXmlcast::eval_xmlcast(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
{
int ret = OB_SUCCESS;
ObExpr *xml_expr = NULL;
ObDatum *xml_datum = NULL;
ObIMulModeBase *xml_doc = NULL;
ObString xml_res_str;
ObEvalCtx::TempAllocGuard tmp_alloc_g(ctx);
common::ObArenaAllocator &allocator = tmp_alloc_g.get_allocator();
ObCollationType cs_type = CS_TYPE_INVALID;
ObMulModeMemCtx* mem_ctx = nullptr;
lib::ObMallocHookAttrGuard malloc_guard(lib::ObMemAttr(ObXMLExprHelper::get_tenant_id(ctx.exec_ctx_.get_my_session()), "XMLModule"));
if (OB_ISNULL(ctx.exec_ctx_.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get session failed.", K(ret));
} else if (OB_FAIL(ObXmlUtil::create_mulmode_tree_context(&allocator, mem_ctx))) {
LOG_WARN("fail to create tree memory context", K(ret));
} else if (OB_UNLIKELY(expr.arg_cnt_ != 2)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid arg_cnt_", K(ret), K(expr.arg_cnt_));
} else if (OB_FAIL(ObXMLExprHelper::get_xmltype_from_expr(expr.args_[0], ctx, xml_datum))) {
// temporally use
LOG_WARN("fail to get xml str", K(ret));
} else if (OB_FAIL(ObXMLExprHelper::get_xml_base(mem_ctx, xml_datum, cs_type, ObNodeMemType::BINARY_TYPE, xml_doc))) {
LOG_WARN("fail to parse xml doc", K(ret));
} else if (OB_FAIL(extract_xml_text_node(mem_ctx, xml_doc, xml_res_str))) {
LOG_WARN("fail to extract xml text node", K(ret), K(xml_res_str));
} else if (OB_FAIL(cast_to_res(allocator, xml_res_str, expr, ctx, res))) {
LOG_WARN("fail to cast to res", K(ret), K(xml_res_str));
}
return ret;
}
int ObExprXmlcast::cast_to_res(ObIAllocator &allocator, ObString &xml_content, const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
{
int ret = OB_SUCCESS;
ObCastMode def_cm = CM_NONE;
ObSQLSessionInfo *session = NULL;
ObObj src_obj,dst_obj, buf_obj;
const ObObj *res_obj = NULL;
ObAccuracy out_acc;
if (xml_content.empty()) {
res.set_null();
} else {
src_obj.set_string(ObVarcharType, xml_content);
src_obj.set_collation_type(CS_TYPE_UTF8MB4_BIN);
// to type
if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("sessioninfo is NULL");
} else if (OB_FAIL(ObSQLUtils::get_default_cast_mode(session->get_stmt_type(),
session, def_cm))) {
LOG_WARN("get_default_cast_mode failed", K(ret));
} else {
ObObjType obj_type = expr.datum_meta_.type_;
ObCollationType cs_type = expr.datum_meta_.cs_type_;
ObPhysicalPlanCtx *phy_plan_ctx = ctx.exec_ctx_.get_physical_plan_ctx();
const ObDataTypeCastParams dtc_params = ObBasicSessionInfo::create_dtc_params(session);
ObCastCtx cast_ctx(&allocator, &dtc_params, get_cur_time(phy_plan_ctx), def_cm,
cs_type, NULL, NULL);
if (OB_FAIL(ObObjCaster::to_type(obj_type, cs_type, cast_ctx, src_obj, dst_obj))) {
LOG_WARN("failed to cast object to ", K(ret), K(src_obj), K(obj_type));
} else if (FALSE_IT(get_accuracy_from_expr(expr, out_acc))) {
} else if (FALSE_IT(res_obj = &dst_obj)) {
} else if (OB_FAIL(obj_accuracy_check(cast_ctx, out_acc, cs_type, dst_obj, buf_obj, res_obj))) {
if ((ob_is_varchar_or_char(obj_type, cs_type) || ob_is_nchar(obj_type)) && ret == OB_ERR_DATA_TOO_LONG) {
ObLengthSemantics ls = lib::is_oracle_mode() ?
expr.datum_meta_.length_semantics_ : LS_CHAR;
const char* str = dst_obj.get_string_ptr();
int32_t str_len_byte = dst_obj.get_string_len();
int64_t char_len = 0;
int32_t trunc_len_byte = 0;
trunc_len_byte = (ls == LS_BYTE ?
ObCharset::max_bytes_charpos(cs_type, str, str_len_byte,
expr.max_length_, char_len):
ObCharset::charpos(cs_type, str, str_len_byte, expr.max_length_));
if (trunc_len_byte == 0) {
(const_cast<ObObj*>(res_obj))->set_null();
} else {
(const_cast<ObObj*>(res_obj))->set_common_value(ObString(trunc_len_byte, str));
}
ret = OB_SUCCESS;
} else {
LOG_WARN("accuracy check failed", K(ret), K(out_acc), K(res_obj));
}
} else if (OB_FAIL(ObSPIService::spi_pad_char_or_varchar(session, obj_type, out_acc, &allocator, const_cast<ObObj *>(res_obj)))) {
LOG_WARN("fail to pad char", K(ret), K(*res_obj));
}
if (OB_SUCC(ret)) {
if (OB_NOT_NULL(res_obj)) {
res.from_obj(*res_obj);
ObExprStrResAlloc res_alloc(expr, ctx);
if (OB_FAIL(res.deep_copy(res, res_alloc))) {
LOG_WARN("fail to deep copy for res datum", K(ret), KPC(res_obj), K(res));
}
} else {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("res obj is NULL", K(ret));
}
}
}
}
return ret;
}
int ObExprXmlcast::extract_xml_text_node(ObMulModeMemCtx* mem_ctx, ObIMulModeBase *xml_doc, ObString &res)
{
int ret = OB_SUCCESS;
ObStringBuffer buff(mem_ctx->allocator_);
ObPathExprIter xpath_iter(mem_ctx->allocator_);
ObString xpath_str = ObString::make_string("//node()");
ObString default_ns; // unused
ObIMulModeBase *xml_node = NULL;
bool is_xml_document = false;
bool is_head_comment = true;
if (OB_ISNULL(xml_doc)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("xml doc node is NULL", K(ret));
} else if (FALSE_IT(is_xml_document = xml_doc->type() == M_DOCUMENT)) {
} else if (OB_FAIL(xpath_iter.init(mem_ctx, xpath_str, default_ns, xml_doc, NULL))) {
LOG_WARN("fail to init xpath iterator", K(xpath_str), K(default_ns), K(ret));
} else if (OB_FAIL(xpath_iter.open())) {
LOG_WARN("fail to open xpath iterator", K(ret));
}
while (OB_SUCC(ret)) {
ObString content;
if (OB_FAIL(xpath_iter.get_next_node(xml_node))) {
if (ret != OB_ITER_END) {
LOG_WARN("fail to get next xml node", K(ret));
}
} else if (OB_ISNULL(xml_node)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("xpath result node is null", K(ret));
} else {
ObMulModeNodeType node_type = xml_node->type();
if (node_type != M_TEXT &&
node_type != M_CDATA &&
node_type != M_COMMENT &&
node_type != M_INSTRUCT) {
is_head_comment = false;
} else if ((node_type == M_COMMENT || node_type == M_INSTRUCT) &&
(is_xml_document || (!is_xml_document && !is_head_comment))) {
/* filter the comment node */
} else if (OB_FAIL(xml_node->get_value(content))) {
LOG_WARN("fail to get text node content", K(ret));
} else if (OB_FAIL(buff.append(content))) {
LOG_WARN("fail to append text node content", K(ret), K(content));
}
}
}
if (ret == OB_ITER_END) {
res.assign_ptr(buff.ptr(), buff.length());
ret = OB_SUCCESS;
}
int tmp_ret = OB_SUCCESS;
if (OB_SUCCESS != (tmp_ret = xpath_iter.close())) {
LOG_WARN("fail to close xpath iter", K(tmp_ret));
ret = COVER_SUCC(tmp_ret);
}
return ret;
}
void ObExprXmlcast::get_accuracy_from_expr(const ObExpr &expr, ObAccuracy &accuracy)
{
accuracy.set_length(expr.max_length_);
accuracy.set_scale(expr.datum_meta_.scale_);
const ObObjTypeClass &dst_tc = ob_obj_type_class(expr.datum_meta_.type_);
if (ObStringTC == dst_tc || ObTextTC == dst_tc) {
accuracy.set_length_semantics(expr.datum_meta_.length_semantics_);
} else {
accuracy.set_precision(expr.datum_meta_.precision_);
}
}
#endif
} // sql
} // oceanbase
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