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oceanbase/src/sql/engine/expr/ob_expr_xmlparse.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.
* This file is for func xmlparse.
*/
#include "ob_expr_xmlparse.h"
#include "sql/engine/ob_exec_context.h"
#ifdef OB_BUILD_ORACLE_XML
#include "sql/engine/expr/ob_expr_xml_func_helper.h"
#include "lib/xml/ob_xml_tree.h"
#include "lib/xml/ob_xml_util.h"
#endif
#define USING_LOG_PREFIX SQL_ENG
using namespace oceanbase::common;
namespace oceanbase
{
namespace sql
{
ObExprXmlparse :: ObExprXmlparse(common::ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_XMLPARSE, N_XMLPARSE, MORE_THAN_TWO, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
{
}
ObExprXmlparse::~ObExprXmlparse() {}
int ObExprXmlparse::calc_result_typeN(ObExprResType &type,
ObExprResType *types_stack,
int64_t param_num,
ObExprTypeCtx &type_ctx) const
{
UNUSED(type_ctx);
INIT_SUCC(ret);
if (OB_UNLIKELY(param_num != 4)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("invalid param number", K(ret), K(param_num));
} else if (!is_called_in_sql()) {
ret = OB_ERR_SP_LILABEL_MISMATCH;
LOG_WARN("expr call in pl semantics disallowed", K(ret), K(N_XMLPARSE));
LOG_USER_ERROR(OB_ERR_SP_LILABEL_MISMATCH, static_cast<int>(strlen(N_XMLPARSE)), N_XMLPARSE);
} else {
// param 0 indicate type is document or content
// param 1 is xml text for parsing
// param 2 indicate wellformed or not
// param 3 is output format only used with xmlagg, should be removed when xml binary ready
ObObjType xml_type = types_stack[1].get_type();
if (types_stack[1].get_type() == ObNullType) {
} else if (ob_is_string_type(xml_type)) {
if (types_stack[1].get_collation_type() == CS_TYPE_BINARY) {
ret = OB_ERR_INVALID_XML_DATATYPE;
LOG_USER_ERROR(OB_ERR_INVALID_XML_DATATYPE, "CHAR", ob_obj_type_str(xml_type));
LOG_WARN("Unsupport for string type with binary charset input.", K(ret), K(xml_type));
} else if (types_stack[1].get_charset_type() != CHARSET_UTF8MB4) {
types_stack[1].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
}
} else {
ret = OB_ERR_INVALID_XML_DATATYPE;
LOG_USER_ERROR(OB_ERR_INVALID_XML_DATATYPE, "CHAR", ob_obj_type_str(xml_type));
LOG_WARN("invalid type, expect char", K(ret), K(xml_type));
}
for (int64_t i = 0; i < param_num && OB_SUCC(ret) && i != 1; i++) {
if (types_stack[i].get_type() == ObNullType) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("param0 type is unexpected", K(types_stack[i].get_type()));
} else if (types_stack[i].get_type() != ObIntType) {
types_stack[i].set_calc_type(ObIntType);
}
}
if (OB_SUCC(ret)) {
type.set_sql_udt(ObXMLSqlType);
}
}
return ret;
}
#ifdef OB_BUILD_ORACLE_XML
int ObExprXmlparse::eval_xmlparse(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
{
INIT_SUCC(ret);
ObDatum *xml_datum = NULL;
ObString xml_plain_text;
ObMulModeNodeType res_type;
uint8_t xml_type = OB_XML_DOC_TYPE_IMPLICIT;
uint8_t is_wellformed = OB_WELLFORMED_IMPLICIT;
bool is_xml_text_null = false;
bool need_format = false;
ObEvalCtx::TempAllocGuard tmp_alloc_g(ctx);
common::ObArenaAllocator &tmp_allocator = tmp_alloc_g.get_allocator();
ObMulModeMemCtx* mem_ctx = nullptr;
lib::ObMallocHookAttrGuard malloc_guard(lib::ObMemAttr(ObXMLExprHelper::get_tenant_id(ctx.exec_ctx_.get_my_session()), "XMLCodeGen"));
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(&tmp_allocator, mem_ctx))) {
LOG_WARN("fail to create tree memory context", K(ret));
} else if (OB_UNLIKELY(expr.arg_cnt_ != 4)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid arg_cnt_", K(expr.arg_cnt_));
} else if (OB_FAIL(expr.args_[3]->eval(ctx, xml_datum))) {
LOG_WARN("get extra para failed", K(ret));
} else if (FALSE_IT(need_format = (xml_datum->get_int() & 0x08) != 0)) {
} else if (OB_FAIL(get_clause_opt(expr, ctx, 0, xml_type, OB_XML_DOC_TYPE_COUNT))) {
LOG_WARN("get document/context error", K(ret), K(xml_type));
} else if (OB_FAIL(get_clause_opt(expr, ctx, 2, is_wellformed, OB_WELLFORMED_COUNT))) {
LOG_WARN("get wellformed error", K(ret), K(is_wellformed));
} else if (OB_FAIL(expr.args_[1]->eval(ctx, xml_datum))) {
LOG_WARN("get extra para failed", K(ret));
} else if (expr.args_[1]->datum_meta_.type_ == ObNullType || xml_datum->is_null()) {
is_xml_text_null = true;
} else if (OB_FAIL(ObTextStringHelper::get_string(expr, tmp_allocator, 1, xml_datum, xml_plain_text))) {
LOG_WARN("get xml plain text failed", K(ret), K(is_xml_text_null));
}
bool is_unparsed_res = false;
if(OB_FAIL(ret)) {
} else if (is_xml_text_null) {
res.set_null();
} else {
ObXmlDocument* doc = nullptr;
ObXmlParser parser(mem_ctx);
if (xml_type == OB_XML_DOCUMENT) {
if (is_wellformed) {
res_type = M_UNPARESED_DOC;
if(OB_FAIL(ObMulModeFactory::add_unparsed_text_into_doc(mem_ctx, xml_plain_text, doc))) {
LOG_WARN("add text failed", K(ret), K(xml_plain_text));
}
} else if (OB_FAIL(parser.parse_document(xml_plain_text))) {
ret = OB_ERR_XML_PARSE;
LOG_USER_ERROR(OB_ERR_XML_PARSE);
LOG_WARN("parse xml plain text as document failed.", K(xml_plain_text));
} else {
res_type = M_DOCUMENT;
doc = parser.document();
}
} else if (xml_type == OB_XML_CONTENT) {
if (!is_wellformed) {
if (OB_FAIL(parser.parse_content(xml_plain_text))) {
ret = OB_ERR_XML_PARSE;
LOG_USER_ERROR(OB_ERR_XML_PARSE);
LOG_WARN("parse xml plain text as content failed.", K(xml_plain_text));
} else {
res_type = M_CONTENT;
doc = parser.document();
}
} else {
is_unparsed_res = true;
res_type = M_UNPARSED;
if (OB_ISNULL(doc = OB_NEWx(ObXmlDocument, mem_ctx->allocator_, ObMulModeNodeType::M_DOCUMENT, mem_ctx))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("fail to create document", K(ret));
} else if(OB_FAIL(doc->append_unparse_text(xml_plain_text))) {
LOG_WARN("fail to add unparse text to doc", K(ret));
}
}
}
if (OB_SUCC(ret)) {
ObCollationType session_cs_type = CS_TYPE_UTF8MB4_BIN;
if (!doc->get_encoding().empty() || doc->get_encoding_flag()) {
doc->set_encoding(ObXmlUtil::get_charset_name(session_cs_type));
}
if (OB_FAIL(ObXMLExprHelper::pack_xml_res(expr, ctx, res, doc, mem_ctx,
res_type,
xml_plain_text))) {
LOG_WARN("pack_xml_res failed", K(ret));
}
}
}
return ret;
}
#endif
int ObExprXmlparse::get_clause_opt(const ObExpr &expr,
ObEvalCtx &ctx,
uint8_t index,
uint8_t &type,
uint8_t size_para)
{
INIT_SUCC(ret);
int num_args = expr.arg_cnt_;
if (OB_UNLIKELY(index >= num_args)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid args num", K(index), K(num_args));
} else {
ObExpr *xml_arg = expr.args_[index];
ObObjType val_type = xml_arg->datum_meta_.type_;
ObDatum *xml_datum = NULL;
if (OB_FAIL(xml_arg->eval(ctx, xml_datum))) {
LOG_WARN("eval xml arg failed", K(ret));
} else if (val_type != ObIntType) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("input type error", K(val_type));
} else {
int64_t option_type = xml_datum->get_int();
if (option_type < 0 || option_type >= size_para) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("input option type error", K(option_type));
} else {
type = static_cast<uint8_t>(option_type);
}
}
}
return ret;
}
int ObExprXmlparse::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_xmlparse;
return OB_SUCCESS;
}
} // sql
} // oceanbase
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