127 lines
3.9 KiB
C++
127 lines
3.9 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 implementation of func json_merge_preserve
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_expr_json_merge_preserve.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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ObExprJsonMergePreserve::ObExprJsonMergePreserve(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc,
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T_FUN_SYS_JSON_MERGE_PRESERVE,
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N_JSON_MERGE_PRESERVE,
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MORE_THAN_ONE,
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NOT_ROW_DIMENSION)
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{
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}
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ObExprJsonMergePreserve::ObExprJsonMergePreserve(
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ObIAllocator &alloc,
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ObExprOperatorType type,
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const char *name,
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int32_t param_num,
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int32_t dimension) : ObFuncExprOperator(alloc, type, name, param_num, dimension)
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{
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;
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}
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ObExprJsonMergePreserve::~ObExprJsonMergePreserve()
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{
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}
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int ObExprJsonMergePreserve::calc_result_typeN(ObExprResType& type,
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ObExprResType* types_stack,
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int64_t param_num,
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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_json();
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type.set_length((ObAccuracy::DDL_DEFAULT_ACCURACY[ObJsonType]).get_length());
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bool is_result_null = false;
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for (int64_t i = 0; OB_SUCC(ret) && !is_result_null && i < param_num; i++) {
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if (types_stack[0].get_type() == ObNullType) {
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is_result_null = true;
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} else if (OB_FAIL(ObJsonExprHelper::is_valid_for_json(types_stack, i, N_JSON_MERGE_PRESERVE))) {
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LOG_WARN("wrong type for json doc.", K(ret), K(types_stack[i].get_type()));
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}
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}
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return ret;
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}
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int ObExprJsonMergePreserve::eval_json_merge_preserve(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
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{
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INIT_SUCC(ret);
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ObDatum *json_datum = NULL;
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ObEvalCtx::TempAllocGuard tmp_alloc_g(ctx);
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common::ObArenaAllocator &temp_allocator = tmp_alloc_g.get_allocator();
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ObIJsonBase *j_base = NULL;
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ObIJsonBase *j_patch_node = NULL;
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bool has_null = false;
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if (expr.datum_meta_.cs_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(expr.datum_meta_.cs_type_));
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}
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for (int32 i = 0; OB_SUCC(ret) && i < expr.arg_cnt_ && !has_null; i++) {
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if (OB_FAIL(ObJsonExprHelper::get_json_doc(expr, ctx, temp_allocator, i, j_patch_node, has_null))) {
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LOG_WARN("get_json_doc failed", K(ret));
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} else if (has_null) {
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// do nothing
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} else {
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if (i == 0) {
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j_base = j_patch_node;
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} else {
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ObIJsonBase *j_res = NULL;
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if (OB_FAIL(j_base->merge_tree(&temp_allocator, j_patch_node, j_res))) {
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LOG_WARN("error, merge tree failed", K(ret), K(i));
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} else {
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j_base = j_res;
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}
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}
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}
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}
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if (OB_SUCC(ret)) {
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ObString raw_bin;
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if (has_null) {
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res.set_null();
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} else if (OB_FAIL(j_base->get_raw_binary(raw_bin, &temp_allocator))) {
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LOG_WARN("failed: get json raw binary", K(ret));
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} else if (OB_FAIL(ObJsonExprHelper::pack_json_str_res(expr, ctx, res, raw_bin))) {
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LOG_WARN("fail to pack json result", 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 ObExprJsonMergePreserve::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_merge_preserve;
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return OB_SUCCESS;
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}
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}
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}
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