support json type
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xj0
181
src/sql/engine/expr/ob_expr_json_unquote.cpp
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181
src/sql/engine/expr/ob_expr_json_unquote.cpp
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/**
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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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*/
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// This file is for implement of func json_unquote
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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_expr_json_unquote.h"
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#include "sql/engine/expr/ob_expr_json_func_helper.h"
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using namespace oceanbase::common;
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using namespace oceanbase::sql;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprJsonUnquote::ObExprJsonUnquote(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc,T_FUN_SYS_JSON_UNQUOTE,
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N_JSON_UNQUOTE, 1, NOT_ROW_DIMENSION)
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{
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}
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ObExprJsonUnquote::~ObExprJsonUnquote()
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{
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}
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int ObExprJsonUnquote::calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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INIT_SUCC(ret);
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type.set_type(ObLongTextType);
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type.set_collation_type(CS_TYPE_UTF8MB4_BIN);
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type.set_collation_level(CS_LEVEL_IMPLICIT);
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if (type1.get_type() == ObNullType || type1.get_type() == ObDoubleType
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|| type1.get_type() == ObIntType) {
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// do nothing
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} else if (type1.get_type() == ObJsonType) {
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type1.set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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} else if (ob_is_string_type(type1.get_type()) && type1.get_collation_type() != CS_TYPE_BINARY) {
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if (type1.get_charset_type() != CHARSET_UTF8MB4) {
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type1.set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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}
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}
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return ret;
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}
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template <typename T>
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int ObExprJsonUnquote::calc(const T &data, ObObjType type, ObCollationType cs_type,
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ObIAllocator *allocator, ObJsonBuffer &j_buf, bool &is_null)
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{
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INIT_SUCC(ret);
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ObIJsonBase *j_base = NULL;
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if (type == ObIntType || type == ObDoubleType) {
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// special for mathematical function, consistent with mysql
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if (data.is_null()) {
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is_null = true;
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} else {
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ret = OB_ERR_INVALID_TYPE_FOR_ARGUMENT;
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LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_ARGUMENT);
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}
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} else if (type == ObNullType || data.is_null()) {
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is_null = true;
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} else if (type != ObJsonType && !ob_is_string_type(type)) {
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LOG_WARN("invalid type", K(type));
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ret = OB_ERR_INVALID_TYPE_FOR_ARGUMENT;
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LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_ARGUMENT);
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} else if (OB_FAIL(ObJsonExprHelper::ensure_collation(type, cs_type))) {
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LOG_WARN("fail to ensure collation", K(ret), K(type), K(cs_type));
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} else {
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ObIJsonBase *j_base = NULL;
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ObString j_text = data.get_string();
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size_t len = j_text.length();
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ObJsonInType j_in_type = ObJsonExprHelper::get_json_internal_type(type);
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if (ob_is_string_type(type) && (len < 2 || j_text[0] != '"' || j_text[len - 1] != '"')) {
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if (OB_FAIL(j_buf.append(j_text))) {
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LOG_WARN("failed: copy original string", K(ret), K(j_text));
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}
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} else if (OB_FAIL(ObJsonBaseFactory::get_json_base(allocator, j_text, j_in_type,
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j_in_type, j_base))) {
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LOG_WARN("failed: get json base", K(ret), K(type));
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if (ret == OB_ERR_INVALID_JSON_TEXT_IN_PARAM) {
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LOG_USER_ERROR(OB_ERR_INVALID_JSON_TEXT_IN_PARAM);
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}
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} else if (OB_FAIL(j_base->print(j_buf, false))) {
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LOG_WARN("failed: print json string", K(ret));
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}
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}
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return ret;
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}
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int ObExprJsonUnquote::calc_result1(common::ObObj &result, const common::ObObj &obj,
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common::ObExprCtx &expr_ctx) const
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{
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INIT_SUCC(ret);
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ObIAllocator *allocator = expr_ctx.calc_buf_;
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ObJsonBuffer j_buf(allocator);
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bool is_null = false;
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if (result_type_.get_collation_type() != CS_TYPE_UTF8MB4_BIN) {
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ret = OB_ERR_INVALID_JSON_CHARSET;
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LOG_WARN("invalid out put charset", K(ret), K(result_type_));
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} else if (OB_ISNULL(allocator)) { // check allocator
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ret = OB_NOT_INIT;
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LOG_WARN("allcator not init", K(ret));
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} else if (OB_FAIL(calc(obj, obj.get_type(), obj.get_collation_type(), allocator, j_buf, is_null))) {
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LOG_WARN("fail to calc json unquote result in old engine", K(ret), K(obj.get_type()));
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} else if (is_null) {
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result.set_null();
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} else {
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// allocate length() + 1; as for alloc(0) will return null result
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char *buf = static_cast<char*>(allocator->alloc(j_buf.length() + 1));
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if (buf) {
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MEMCPY(buf, j_buf.ptr(), j_buf.length());
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result.set_collation_type(result_type_.get_collation_type());
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result.set_string(ObLongTextType, buf, j_buf.length());
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} else {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("fail to alloc memory for json unquote result", K(ret), K(j_buf.length()));
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}
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}
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return ret;
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}
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int ObExprJsonUnquote::eval_json_unquote(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
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{
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INIT_SUCC(ret);
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ObExpr *arg = expr.args_[0];
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ObDatum* json_datum = NULL;
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common::ObArenaAllocator &temp_allocator = ctx.get_reset_tmp_alloc();
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ObObjType val_type = arg->datum_meta_.type_;
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ObCollationType cs_type = arg->datum_meta_.cs_type_;
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ObJsonBuffer j_buf(&temp_allocator);
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bool is_null = false;
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if (OB_FAIL(arg->eval(ctx, json_datum))) {
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ret = OB_ERR_INVALID_DATATYPE;
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LOG_WARN("error, eval json args datum failed", K(ret));
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} else if (OB_FAIL(calc(*json_datum, val_type, cs_type, &temp_allocator, j_buf, is_null))) {
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LOG_WARN("fail to calc json unquote result in new engine", K(ret), K(val_type));
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} else if (is_null) {
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res.set_null();
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} else {
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char *buf = expr.get_str_res_mem(ctx, j_buf.length());
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if (OB_ISNULL(buf)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("fail to alloc memory for json unquote result", K(ret), K(j_buf.length()));
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} else {
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MEMCPY(buf, j_buf.ptr(), j_buf.length());
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res.set_string(buf, j_buf.length());
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}
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}
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return ret;
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}
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int ObExprJsonUnquote::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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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_json_unquote;
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return OB_SUCCESS;
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}
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}
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}
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