199 lines
7.8 KiB
C++
199 lines
7.8 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_array_append
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_expr_json_array_append.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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ObExprJsonArrayAppend::ObExprJsonArrayAppend(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc,
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T_FUN_SYS_JSON_ARRAY_APPEND,
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N_JSON_ARRAY_APPEND,
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MORE_THAN_TWO,
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NOT_ROW_DIMENSION)
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{
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}
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ObExprJsonArrayAppend::~ObExprJsonArrayAppend()
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{
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}
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int ObExprJsonArrayAppend::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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// param_num is odd，JSON_ARRAY_APPEND(json_doc, path, val[, path, val] ...)
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if (OB_UNLIKELY(param_num <= 1 || (param_num & 1 ) == 0)) {
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ret = OB_ERR_PARAM_SIZE;
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const ObString name(N_JSON_ARRAY_APPEND);
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LOG_USER_ERROR(OB_ERR_PARAM_SIZE, name.length(), name.ptr());
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} else {
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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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if (OB_FAIL(ObJsonExprHelper::is_valid_for_json(types_stack, 0, N_JSON_ARRAY_APPEND))) {
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LOG_WARN("wrong type for json doc.", K(ret), K(types_stack[0].get_type()));
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} else {
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for (int64_t i = 1; OB_SUCC(ret) && i < param_num; i += 2) {
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//path type
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if (OB_FAIL(ObJsonExprHelper::is_valid_for_path(types_stack, i))) {
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LOG_WARN("wrong type for json path.", K(ret), K(types_stack[i].get_type()));
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}
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if (OB_SUCC(ret)) {
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if (types_stack[i+1].get_type() == ObNullType) {
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// do nothing
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} else if (ob_is_string_type(types_stack[i+1].get_type())) {
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if (types_stack[i+1].get_charset_type() != CHARSET_UTF8MB4) {
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types_stack[i+1].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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}
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} else if (types_stack[i+1].get_type() == ObJsonType) {
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types_stack[i+1].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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}
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}
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}
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}
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}
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return ret;
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}
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int ObExprJsonArrayAppend::eval_json_array_append(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
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{
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INIT_SUCC(ret);
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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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bool is_null = false;
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ObJsonBaseVector hit;
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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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} else if (OB_FAIL(ObJsonExprHelper::get_json_doc(expr, ctx, temp_allocator,
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0, j_base, is_null))) {
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LOG_WARN("get_json_doc failed", K(ret));
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}
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ObJsonPathCache ctx_cache(&temp_allocator);
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ObJsonPathCache *path_cache = NULL;
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if (OB_SUCC(ret) && !is_null) {
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path_cache = ObJsonExprHelper::get_path_cache_ctx(expr.expr_ctx_id_, &ctx.exec_ctx_);
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path_cache = ((path_cache != NULL) ? path_cache : &ctx_cache);
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}
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for (int32 i = 1; OB_SUCC(ret) && i < expr.arg_cnt_ && !is_null; i += 2) {
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ObExpr *arg = expr.args_[i];
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ObDatum *json_datum = NULL;
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hit.reset();
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if (OB_FAIL(expr.args_[i]->eval(ctx, json_datum))) {
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LOG_WARN("failed: eval json path datum.", K(ret));
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} else if (arg->datum_meta_.type_ == ObNullType || json_datum->is_null()) {
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is_null = true;
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} else {
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ObString j_path_text = json_datum->get_string();
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ObJsonPath *j_path = NULL;
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if (OB_FAIL(ObJsonExprHelper::get_json_or_str_data(arg, ctx, temp_allocator, j_path_text, is_null))) {
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LOG_WARN("fail to get real data.", K(ret), K(j_path_text));
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} else if (OB_FAIL(ObJsonExprHelper::find_and_add_cache(path_cache, j_path, j_path_text, i, false))) {
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LOG_WARN("failed: parse text to path.", K(j_path_text), K(ret));
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} else if (OB_FAIL(j_base->seek(*j_path, j_path->path_node_cnt(), true, true, hit))) {
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LOG_WARN("failed: json seek failed", K(j_path_text), K(ret));
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} else if (hit.size() == 0) {
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// do nothing
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} else {
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ObIJsonBase *j_val = NULL;
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if (OB_FAIL(ObJsonExprHelper::get_json_val(expr, ctx, &temp_allocator, i+1, j_val))) {
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ret = OB_ERR_INVALID_JSON_TEXT_IN_PARAM;
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LOG_WARN("failed: get_json_val.", K(ret), K(i));
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} else {
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// if added position's father is not array(is scaler or object), need pack into array
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// 1. create a new array.
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void *buf = NULL;
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if (OB_ISNULL(buf = temp_allocator.alloc(sizeof(ObJsonArray)))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("fail to alloc a new json array", K(ret));
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} else {
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ObIJsonBase *jb_pos_node = hit[0];
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ObJsonNode *j_pos_node = static_cast<ObJsonNode *>(jb_pos_node);
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if (j_pos_node->json_type() == ObJsonNodeType::J_ARRAY) {
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// set new node parent
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if (OB_FAIL(j_pos_node->array_append(j_val))) {
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LOG_WARN("failed: append array value", K(ret), K(*j_val));
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}
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} else {
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// if added position's father is not array(is scaler or object), need pack into array
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// 1. create a new array.
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void *buf = NULL;
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if (OB_ISNULL(buf = temp_allocator.alloc(sizeof(ObJsonArray)))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("fail to alloc a new json array", K(ret));
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} else {
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ObJsonArray *j_new_arr = new (buf) ObJsonArray(&temp_allocator);
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ObIJsonBase *jb_new_arr = j_new_arr;
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// 2. append old node and new node to new array.
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ObJsonNode *j_parent = j_pos_node->get_parent();
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ObIJsonBase *jb_parent = j_parent;
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if (OB_FAIL(jb_new_arr->array_append(jb_pos_node))) {
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LOG_WARN("fail to append pos node to new array", K(ret), K(*jb_pos_node));
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} else if (OB_FAIL(jb_new_arr->array_append(j_val))) {
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LOG_WARN("fail to append new node to new array", K(ret), K(*j_val));
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} else if (OB_ISNULL(jb_parent)) { // 3.1 root
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j_base = jb_new_arr;
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} else if (OB_FAIL(jb_parent->replace(jb_pos_node, jb_new_arr))){ // 3.2 not root, replace pos node with new array
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LOG_WARN("fail to replace pos node with new array", K(ret), K(*jb_new_arr));
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}
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}
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}
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}
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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 (is_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 ObExprJsonArrayAppend::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_array_append;
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return OB_SUCCESS;
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}
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}
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}
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