support json type
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xj0
213
src/sql/engine/expr/ob_expr_json_length.cpp
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213
src/sql/engine/expr/ob_expr_json_length.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 contains implementation for json_length.
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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_expr_json_length.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/parser/ob_item_type.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "lib/json_type/ob_json_tree.h"
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#include "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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ObExprJsonLength::ObExprJsonLength(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_JSON_LENGTH, N_JSON_LENGTH,
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ONE_OR_TWO, NOT_ROW_DIMENSION)
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{
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}
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ObExprJsonLength::~ObExprJsonLength()
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{
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}
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int ObExprJsonLength::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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INIT_SUCC(ret);
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UNUSED(type_ctx);
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// set result type to int32
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type.set_int32();
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type.set_scale(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].scale_);
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type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
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// 0 position is json doc
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if (OB_FAIL(ObJsonExprHelper::is_valid_for_json(types_stack, 0, N_JSON_LENGTH))) {
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LOG_WARN("wrong type for json doc.", K(ret), K(types_stack[0].get_type()));
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} else if (param_num > 1 && OB_FAIL(ObJsonExprHelper::is_valid_for_path(types_stack, 1))) {
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LOG_WARN("wrong type for json path.", K(ret), K(types_stack[1].get_type()));
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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 ObExprJsonLength::calc(const T &data1, ObObjType type1, ObCollationType cs_type1, const T *data2,
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ObObjType type2, ObIAllocator *allocator, T &res,
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ObJsonPathCache* path_cache)
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{
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INIT_SUCC(ret);
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bool is_null = false;
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uint32_t res_len = 0;
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ObIJsonBase *j_base = NULL;
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// handle data1(json text)
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if (type1 == ObNullType || data1.is_null()) { // null should display "NULL"
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is_null = true;
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} else if (type1 != ObJsonType && !ob_is_string_type(type1)) {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_WARN("input type error", K(type1));
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} else if (OB_FAIL(ObJsonExprHelper::ensure_collation(type1, cs_type1))) {
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LOG_WARN("fail to ensure collation", K(ret), K(type1), K(cs_type1));
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} else {
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ObString j_doc = data1.get_string();
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ObJsonInType j_in_type = ObJsonExprHelper::get_json_internal_type(type1);
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if (j_doc.length() == 0) {
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ret = OB_ERR_INVALID_JSON_TEXT;
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LOG_USER_ERROR(OB_ERR_INVALID_JSON_TEXT);
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} else if (OB_FAIL(ObJsonBaseFactory::get_json_base(allocator, j_doc, j_in_type,
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j_in_type, j_base))) {
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LOG_WARN("fail to get json base", K(ret), K(type1), K(j_doc), K(j_in_type));
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}
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}
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// handle data2(path text)
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if (OB_SUCC(ret) && OB_LIKELY(!is_null)) {
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if (OB_ISNULL(data2)) { // have no path
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res_len = j_base->element_count();
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} else { // handle json path
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if (type2 == ObNullType) { // null should display "NULL"
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is_null = true;
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} else { // ObLongTextType
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ObJsonBaseVector hit;
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ObString j_path_text = data2->get_string();
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ObJsonPath *j_path = NULL;
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if (OB_FAIL(ObJsonExprHelper::find_and_add_cache(path_cache, j_path, j_path_text, 1, false))) {
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LOG_USER_ERROR(OB_ERR_INVALID_JSON_PATH);
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LOG_WARN("fail to parse json path", K(ret), K(type2), K(j_path_text));
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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("fail to seek json node", K(ret), K(j_path_text));
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} else if (hit.size() != 1) { // not found node by path, display "NULL"
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is_null = true;
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} else {
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res_len = hit[0]->element_count();
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}
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}
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}
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}
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// set result
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if (OB_SUCC(ret)) {
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if (is_null) {
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res.set_null();
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} else {
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res.set_int32(res_len);
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}
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}
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return ret;
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}
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// for old sql engine
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int ObExprJsonLength::calc_resultN(common::ObObj &result,
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const common::ObObj *objs,
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int64_t param_num,
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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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if (OB_ISNULL(objs)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid arguments", K(ret), K(objs), K(param_num));
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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("varchar buffer not init", K(ret));
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} else {
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ObObjType path_type = ObMaxType;
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const common::ObObj *path_obj_ptr = NULL;
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if (param_num > 1) {
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path_obj_ptr = &objs[1];
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path_type = objs[1].get_type();
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}
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if (OB_SUCC(ret)) {
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ObJsonPathCache path_cache(allocator);
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if (OB_FAIL(calc(objs[0], objs[0].get_type(), objs[0].get_collation_type(), path_obj_ptr,
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path_type, allocator, result, &path_cache))) {
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LOG_WARN("fail to calc json length result", K(ret), K(objs[0]), K(param_num));
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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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// for new sql engine
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int ObExprJsonLength::eval_json_length(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
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{
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INIT_SUCC(ret);
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ObDatum *datum1 = NULL;
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ObObjType type1 = ObMaxType;
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ObDatum *datum0 = NULL;
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ObExpr *arg0 = expr.args_[0];
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ObObjType type0 = arg0->datum_meta_.type_;
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ObCollationType cs_type0 = arg0->datum_meta_.cs_type_;
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common::ObArenaAllocator &tmp_allocator = ctx.get_reset_tmp_alloc();
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if (OB_FAIL(arg0->eval(ctx, datum0))) { // json doc
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LOG_WARN("fail to eval json arg", K(ret), K(type1));
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} else {
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if (expr.arg_cnt_ > 1) { // json path
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ObExpr *arg1 = expr.args_[1];
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type1 = arg1->datum_meta_.type_;
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if (OB_FAIL(arg1->eval(ctx, datum1))) {
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LOG_WARN("fail to eval path arg", K(ret), K(type1));
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}
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}
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}
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if (OB_SUCC(ret)) {
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ObJsonPathCache ctx_cache(&tmp_allocator);
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ObJsonPathCache* 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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if (OB_FAIL(calc(*datum0, type0, cs_type0, datum1, type1, &tmp_allocator, res, path_cache))) {
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LOG_WARN("fail to calc json length result", K(ret), K(datum0), K(expr.arg_cnt_));
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}
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}
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return ret;
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}
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int ObExprJsonLength::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_length;
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return OB_SUCCESS;
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}
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}
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}
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