4afa70a218
Co-authored-by: Carrot-77 <1012982871@qq.com> Co-authored-by: wu-xingying <729224612@qq.com>
195 lines
7.6 KiB
C++
195 lines
7.6 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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* This file is for func xmlcast.
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*/
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#include "ob_expr_xmlcast.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/engine/ob_exec_context.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "lib/xml/ob_xml_parser.h"
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#include "lib/xml/ob_xml_tree.h"
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#include "lib/xml/ob_xml_util.h"
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#include "lib/xml/ob_xpath.h"
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#include "sql/engine/expr/ob_expr_xml_func_helper.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/ob_exec_context.h"
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#include "sql/ob_spi.h"
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#define USING_LOG_PREFIX SQL_ENG
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using namespace oceanbase::common;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprXmlcast::ObExprXmlcast(common::ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_XMLCAST, N_XMLCAST, 2, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprXmlcast::~ObExprXmlcast() {}
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int ObExprXmlcast::calc_result_type2(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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common::ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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ObObjType xml_type = type1.get_type();
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uint64_t subschema_id = type1.get_subschema_id();
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if (!is_called_in_sql()) {
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ret = OB_ERR_SP_LILABEL_MISMATCH;
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LOG_WARN("expr call in pl semantics disallowed", K(ret), K(N_XMLCAST));
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LOG_USER_ERROR(OB_ERR_SP_LILABEL_MISMATCH, static_cast<int>(strlen(N_XMLCAST)), N_XMLCAST);
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} else if (type1.is_ext() && type1.get_udt_id() == T_OBJ_XML) {
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type1.get_calc_meta().set_sql_udt(ObXMLSqlType);
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} else if (!ob_is_xml_sql_type(xml_type, subschema_id)) {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_OP, "-", "-");
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LOG_WARN("inconsistent datatypes", K(ret), K(ob_obj_type_str(xml_type)));
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}
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if (OB_FAIL(ret)) {
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} else if (OB_FAIL(set_dest_type(type2, type, type_ctx))) {
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LOG_WARN("fail to set return type", K(ret));
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}
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return ret;
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}
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int ObExprXmlcast::set_dest_type(ObExprResType ¶m_type, ObExprResType &dst_type, ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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const sql::ObSQLSessionInfo *session = type_ctx.get_session();
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if (!param_type.is_int() && !param_type.get_param().is_int()) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("cast param type is unexpected", K(param_type));
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} else {
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const ObObj ¶m = param_type.get_param();
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ParseNode node;
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node.value_ = param.get_int();
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ObObjType obj_type = static_cast<ObObjType>(node.int16_values_[OB_NODE_CAST_TYPE_IDX]);
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ObCollationType cs_type = static_cast<ObCollationType>(node.int16_values_[OB_NODE_CAST_COLL_IDX]);
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int64_t text_length = node.int32_values_[1];
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ObObjTypeClass dest_tc = ob_obj_type_class(obj_type);
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ObAccuracy accuracy;
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// set obj_type
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dst_type.set_type(obj_type);
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dst_type.set_collation_type(cs_type);
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// set cs_type
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if (!ObCharset::is_valid_collation(cs_type)) {
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ObCollationType collation_connection = type_ctx.get_coll_type();
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ObCollationType collation_nation = session->get_nls_collation_nation();
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// use collation of current session
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dst_type.set_collation_type(ob_is_nstring_type(dst_type.get_type()) ?
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collation_nation : collation_connection);
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}
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if (ob_is_string_or_lob_type(obj_type)) {
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dst_type.set_collation_level(CS_LEVEL_IMPLICIT);
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}
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// set accuracy
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if (ObStringTC == dest_tc) {
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// parser will abort all negative number
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// if length < 0 means DEFAULT_STR_LENGTH or OUT_OF_STR_LEN.
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accuracy.set_full_length(node.int32_values_[1], param_type.get_accuracy().get_length_semantics(),
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lib::is_oracle_mode());
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} else if(ObTextTC == dest_tc) {
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accuracy.set_length(ObAccuracy::DDL_DEFAULT_ACCURACY[obj_type].get_length());
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} else if (ObIntervalTC == dest_tc) {
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if (OB_UNLIKELY(!ObIntervalScaleUtil::scale_check(node.int16_values_[3]) ||
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!ObIntervalScaleUtil::scale_check(node.int16_values_[2]))) {
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ret = OB_ERR_DATETIME_INTERVAL_PRECISION_OUT_OF_RANGE;
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} else {
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ObScale scale = (obj_type == ObIntervalYMType) ?
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ObIntervalScaleUtil::interval_ym_scale_to_ob_scale(
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static_cast<int8_t>(node.int16_values_[3]))
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: ObIntervalScaleUtil::interval_ds_scale_to_ob_scale(
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static_cast<int8_t>(node.int16_values_[2]),
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static_cast<int8_t>(node.int16_values_[3]));
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accuracy.set_scale(scale);
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}
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} else {
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const ObAccuracy &def_acc =
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ObAccuracy::DDL_DEFAULT_ACCURACY2[lib::is_oracle_mode()][obj_type];
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if (ObNumberType == obj_type && 0 == node.int16_values_[2]) {
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accuracy.set_precision(def_acc.get_precision());
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} else {
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accuracy.set_precision(node.int16_values_[2]);
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}
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accuracy.set_scale(node.int16_values_[3]);
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if (lib::is_oracle_mode() && ObDoubleType == obj_type) {
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accuracy.set_accuracy(def_acc.get_precision());
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}
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}
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dst_type.set_accuracy(accuracy);
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}
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return ret;
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}
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int ObExprXmlcast::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
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{
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UNUSED(expr_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = eval_xmlcast;
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return OB_SUCCESS;
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}
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int ObExprXmlcast::eval_xmlcast(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
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{
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int ret = OB_SUCCESS;
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ObExpr *xml_expr = NULL;
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ObDatum *xml_datum = NULL;
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ObIMulModeBase *xml_doc = NULL;
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ObString xml_res_str;
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ObEvalCtx::TempAllocGuard tmp_alloc_g(ctx);
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common::ObArenaAllocator &allocator = tmp_alloc_g.get_allocator();
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ObCollationType cs_type = CS_TYPE_INVALID;
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ObMulModeMemCtx* mem_ctx = nullptr;
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lib::ObMallocHookAttrGuard malloc_guard(lib::ObMemAttr(ObXMLExprHelper::get_tenant_id(ctx.exec_ctx_.get_my_session()), "XMLModule"));
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if (OB_ISNULL(ctx.exec_ctx_.get_my_session())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get session failed.", K(ret));
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} else if (OB_FAIL(ObXmlUtil::create_mulmode_tree_context(&allocator, mem_ctx))) {
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LOG_WARN("fail to create tree memory context", K(ret));
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} else if (OB_UNLIKELY(expr.arg_cnt_ != 2)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg_cnt_", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(ObXMLExprHelper::get_xmltype_from_expr(expr.args_[0], ctx, xml_datum))) {
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// temporally use
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LOG_WARN("fail to get xml str", K(ret));
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} else if (OB_FAIL(ObXMLExprHelper::get_xml_base(mem_ctx, xml_datum, cs_type, ObNodeMemType::BINARY_TYPE, xml_doc))) {
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LOG_WARN("fail to parse xml doc", K(ret));
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} else if (OB_FAIL(ObXMLExprHelper::extract_xml_text_node(mem_ctx, xml_doc, xml_res_str))) {
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LOG_WARN("fail to extract xml text node", K(ret), K(xml_res_str));
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} else if (OB_FAIL(ObXMLExprHelper::cast_to_res(allocator, xml_res_str, expr, ctx, res))) {
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LOG_WARN("fail to cast to res", K(ret), K(xml_res_str));
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}
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return ret;
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}
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DEF_SET_LOCAL_SESSION_VARS(ObExprXmlcast, raw_expr) {
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int ret = OB_SUCCESS;
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SET_LOCAL_SYSVAR_CAPACITY(5);
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EXPR_ADD_LOCAL_SYSVAR(SYS_VAR_NLS_DATE_FORMAT);
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EXPR_ADD_LOCAL_SYSVAR(SYS_VAR_NLS_TIMESTAMP_FORMAT);
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EXPR_ADD_LOCAL_SYSVAR(SYS_VAR_NLS_TIMESTAMP_TZ_FORMAT);
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EXPR_ADD_LOCAL_SYSVAR(SYS_VAR_TIME_ZONE);
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EXPR_ADD_LOCAL_SYSVAR(SYS_VAR_COLLATION_CONNECTION);
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return ret;
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}
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} // sql
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} // oceanbase
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