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435
src/sql/engine/expr/ob_expr_regexp_substr.cpp
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435
src/sql/engine/expr/ob_expr_regexp_substr.cpp
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@ -0,0 +1,435 @@
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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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#define USING_LOG_PREFIX SQL_ENG
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#include "sql/engine/expr/ob_expr_regexp_substr.h"
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#include "lib/oblog/ob_log.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/engine/ob_physical_plan_ctx.h"
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#include "sql/engine/ob_physical_plan.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "sql/engine/expr/ob_expr_regexp_count.h"
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using namespace oceanbase::common;
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namespace oceanbase {
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namespace sql {
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// Modify the previously defined T_OP_REGEXP_SUBSTR to T_FUN_SYS_REGEXP_SUBSTR, because the previous
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// registered value of T_OP_REGEXP_SUBSTR is only in mysql
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ObExprRegexpSubstr::ObExprRegexpSubstr(ObIAllocator& alloc)
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: ObStringExprOperator(alloc, T_FUN_SYS_REGEXP_SUBSTR, N_REGEXP_SUBSTR, MORE_THAN_ONE)
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{}
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ObExprRegexpSubstr::~ObExprRegexpSubstr()
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{}
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int ObExprRegexpSubstr::calc_result_typeN(
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ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const
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{
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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CK(NULL != type_ctx.get_raw_expr());
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if (OB_FAIL(ret)) {
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// Because the introduced regular expression library engine has utf8 restrictions, it is necessary
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// to reset the relevant parameter types and implicitly convert
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} else if (OB_UNLIKELY(param_num < 2 || param_num > 6)) {
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ret = OB_ERR_PARAM_SIZE;
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LOG_WARN("param number of regexp_substr at least 2 and at most 6", K(ret), K(param_num));
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} else {
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for (int i = 0; OB_SUCC(ret) && i < param_num; i++) {
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if (!types[i].is_null() && !is_type_valid(types[i].get_type())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("the parameter is not castable", K(ret), K(i));
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}
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}
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if (lib::is_oracle_mode()) {
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// set max length.
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type.set_length(static_cast<common::ObLength>(types[0].get_length()));
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bool prefer_varchar = true;
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auto str_params = make_const_carray(&types[0]);
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OZ(aggregate_string_type_and_charset_oracle(*type_ctx.get_session(), str_params, type, prefer_varchar));
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OZ(deduce_string_param_calc_type_and_charset(*type_ctx.get_session(), type, str_params));
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OX(type.set_length_semantics(type_ctx.get_session()->get_actual_nls_length_semantics()));
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} else {
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const common::ObLengthSemantics default_length_semantics =
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(OB_NOT_NULL(type_ctx.get_session()) ? type_ctx.get_session()->get_actual_nls_length_semantics()
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: common::LS_BYTE);
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type.set_varchar();
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type.set_length(types[0].get_length());
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type.set_length_semantics(
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types[0].is_varchar_or_char() ? types[0].get_length_semantics() : default_length_semantics);
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ret = aggregate_charsets_for_string_result(type, types, 1, type_ctx.get_coll_type());
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}
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if (OB_SUCC(ret)) { // because of regexp engine need utf8 code, here need reset calc collation type and can
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// implicit cast.
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switch (param_num) {
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case 6:
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if (lib::is_oracle_mode()) {
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types[5].set_calc_type(ObNumberType);
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} else {
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_STRING_INTEGER_TRUNC);
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types[5].set_calc_type(ObIntType);
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}
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case 5:
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types[4].set_calc_type(ObVarcharType);
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case 4:
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if (lib::is_oracle_mode()) {
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types[3].set_calc_type(ObNumberType);
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} else {
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_STRING_INTEGER_TRUNC);
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types[3].set_calc_type(ObIntType);
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}
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case 3:
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if (lib::is_oracle_mode()) {
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types[2].set_calc_type(ObNumberType);
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} else {
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_STRING_INTEGER_TRUNC);
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types[2].set_calc_type(ObIntType);
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}
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case 2:
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types[1].set_calc_type(ObVarcharType);
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if (ObCharset::is_bin_sort(types[1].get_calc_collation_type())) {
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types[1].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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} else {
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types[1].set_calc_collation_type(CS_TYPE_UTF8MB4_GENERAL_CI);
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}
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types[1].set_calc_collation_level(type.get_collation_level());
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if (!types[0].is_clob()) {
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types[0].set_calc_type(ObVarcharType);
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if (ObCharset::is_bin_sort(types[0].get_calc_collation_type())) {
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types[0].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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} else {
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types[0].set_calc_collation_type(CS_TYPE_UTF8MB4_GENERAL_CI);
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}
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types[0].set_calc_collation_level(type.get_collation_level());
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}
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default:
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// already check before
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break;
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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 ObExprRegexpSubstr::calc_resultN(
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common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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bool has_null = false;
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ObString text, pattern, match_param;
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int64_t position = 1, occurrence = 1, subexpr = 0;
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bool is_flag_null = false;
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if (OB_ISNULL(expr_ctx.calc_buf_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("varchar buffer not init or exec ctx or physical plan ctx is NULL", K(expr_ctx.calc_buf_));
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} else {
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for (int i = 0; !has_null && i < param_num; i++) {
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// match param is null, use default flags
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if (objs[i].is_null()) {
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if (share::is_oracle_mode() && i == 4) { // compatible oracle
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} else {
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has_null = true;
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is_flag_null = (i == 4);
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}
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}
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}
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for (int i = 0; OB_SUCC(ret) && i < param_num; i++) {
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if (!objs[i].is_null() && !is_type_valid(objs[i].get_type())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument", K(ret), K(i), K(objs[i]));
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}
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}
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if (OB_SUCC(ret)) {
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switch (param_num) {
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case 6:
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if (!objs[5].is_null()) {
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if (OB_FAIL(ObExprUtil::get_trunc_int64(objs[5], expr_ctx, subexpr))) {
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LOG_WARN("fail get position", K(subexpr), K(ret));
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break;
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} else if (OB_UNLIKELY(subexpr < 0)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("regexp_instr subexpr is invalid", K(ret), K(subexpr));
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break;
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}
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}
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case 5:
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if (!objs[4].is_null()) {
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TYPE_CHECK(objs[4], ObVarcharType);
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match_param = objs[4].get_string();
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}
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case 4:
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if (!objs[3].is_null()) {
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if (OB_FAIL(ObExprUtil::get_trunc_int64(objs[3], expr_ctx, occurrence))) {
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LOG_WARN("fail get position", K(occurrence), K(ret));
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break;
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} else if (OB_UNLIKELY(occurrence <= 0)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("regexp_instr occurrence is invalid", K(ret), K(occurrence));
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break;
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}
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}
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case 3:
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if (!objs[2].is_null()) {
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if (OB_FAIL(ObExprUtil::get_trunc_int64(objs[2], expr_ctx, position))) {
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LOG_WARN("fail get position", K(position), K(ret));
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break;
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} else if (OB_UNLIKELY(position < 0)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("regexp_instr position is invalid", K(ret), K(position));
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break;
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}
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}
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case 2:
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if (!objs[1].is_null()) {
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TYPE_CHECK(objs[1], ObVarcharType);
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pattern = objs[1].get_string();
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if (share::is_mysql_mode() && pattern.empty() && !is_flag_null) { // compatible mysql
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ret = OB_ERR_REGEXP_ERROR;
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LOG_WARN("empty regex expression", K(ret));
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}
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}
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if (OB_FAIL(ret)) {
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} else if (!objs[0].is_null() && !objs[0].is_clob()) {
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TYPE_CHECK(objs[0], ObVarcharType);
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text = objs[0].get_string();
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} else if (objs[0].is_clob()) {
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text = objs[0].get_string();
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}
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default:
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break;
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}
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ObExprRegexContext regexp_obj;
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if (OB_SUCC(ret)) {
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bool is_null = false;
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ObString res;
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if (OB_FAIL(calc(res,
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is_null,
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text,
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pattern,
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position,
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occurrence,
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result_type_.get_collation_type(),
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match_param,
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subexpr,
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has_null,
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®exp_obj,
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*expr_ctx.calc_buf_))) {
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LOG_WARN(
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"fail to cacl regexp_substr", K(ret), K(text), K(pattern), K(occurrence), K(match_param), K(subexpr));
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} else if (is_null) {
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result.set_null();
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} else if (objs[0].is_clob()) {
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result.set_lob_value(ObLongTextType, res.ptr(), res.length());
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} else {
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result.set_string(ObVarcharType, res);
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}
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}
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}
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}
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if (OB_LIKELY(OB_SUCCESS == ret && !result.is_null())) {
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result.set_collation_type(ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4));
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if (OB_FAIL(convert_result_collation(result_type_, result, expr_ctx.calc_buf_))) {
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LOG_WARN("failed to convert result collation", K(ret));
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} else {
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result.set_collation(result_type_);
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}
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}
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return ret;
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}
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int ObExprRegexpSubstr::calc(ObString& result, bool& is_null, const ObString& text, const ObString& pattern,
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int64_t position, int64_t occurrence, const ObCollationType cs_type, const ObString& match_param, int64_t subexpr,
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bool has_null_argument, ObExprRegexContext* regexp_ptr, ObExprStringBuf& string_buf)
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{
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int ret = OB_SUCCESS;
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// begin with '^'
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bool from_begin = false;
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// end with '$'
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bool from_end = false;
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ObExprRegexContext* regexp_substr_ctx = regexp_ptr;
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ObSEArray<uint32_t, 4> begin_locations(common::ObModIds::OB_SQL_EXPR_REPLACE, common::OB_MALLOC_NORMAL_BLOCK_SIZE);
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int flags = 0, multi_flag = 0;
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const bool reusable = false;
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ObString sub;
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if (OB_ISNULL(regexp_substr_ctx)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("regexp ptr is null", K(ret));
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} else if (!regexp_substr_ctx->is_inited()) {
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if (OB_FAIL(ObExprRegexpCount::get_regexp_flags(cs_type, match_param, flags, multi_flag))) {
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LOG_WARN("fail to get regexp flags", K(ret), K(match_param));
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} else if (OB_FAIL(regexp_substr_ctx->init(pattern, flags, string_buf, reusable))) {
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LOG_WARN("fail to init regexp", K(pattern), K(flags));
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}
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}
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if (OB_SUCC(ret)) {
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if (has_null_argument) {
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is_null = true;
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} else if (position <= 0 || occurrence <= 0) {
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if (share::is_oracle_mode()) {
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ret = OB_ERR_ARGUMENT_OUT_OF_RANGE;
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} else {
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ret = OB_INVALID_ARGUMENT;
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}
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LOG_WARN("position or occurrence is invalid", K(ret), K(position), K(occurrence));
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} else {
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if (!pattern.empty()) {
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const char* pat = pattern.ptr();
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if ('^' == pat[0]) {
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from_begin = true;
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||||
} else if ('$' == pat[pattern.length() - 1]) {
|
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from_end = true;
|
||||
}
|
||||
}
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||||
if (OB_FAIL(begin_locations.push_back(position - 1))) {
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||||
LOG_WARN("begin_locations push_back error", K(ret));
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} else if (from_begin && 1 != position && multi_flag) {
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is_null = true;
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result = ObString();
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||||
} else {
|
||||
ObSEArray<size_t, 4> byte_num;
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||||
ObSEArray<size_t, 4> byte_offsets;
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if (OB_FAIL(ObExprUtil::get_mb_str_info(
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||||
text, ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4), byte_num, byte_offsets))) {
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||||
LOG_WARN("failed to get mb str info", K(ret));
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||||
} else if (multi_flag) {
|
||||
if (from_begin && 1 != position) {
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||||
begin_locations.pop_back();
|
||||
}
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||||
const char* text_ptr = text.ptr();
|
||||
for (int64_t idx = position; OB_SUCC(ret) && idx < byte_offsets.count() - 1; ++idx) {
|
||||
if (OB_UNLIKELY(byte_offsets.at(idx) >= text.length())) {
|
||||
ret = OB_ERR_UNEXPECTED;
|
||||
LOG_WARN("get unexpected error", K(byte_offsets.at(idx)), K(text.length()), K(ret));
|
||||
} else if (text_ptr[byte_offsets.at(idx)] == '\n') {
|
||||
if (OB_FAIL(begin_locations.push_back(idx + 1))) {
|
||||
LOG_WARN("begin_locations push_back error", K(ret));
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if (OB_SUCC(ret)) {
|
||||
if (OB_FAIL(regexp_substr_ctx->substr(
|
||||
text, occurrence, subexpr, sub, string_buf, from_begin, from_end, begin_locations))) {
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||||
LOG_WARN(
|
||||
"fail to get substr", K(ret), K(text), K(pattern), K(occurrence), K(match_param), K(flags), K(subexpr));
|
||||
} else if (lib::is_mysql_mode() && OB_ISNULL(sub.ptr())) {
|
||||
is_null = true;
|
||||
} else if (lib::is_oracle_mode() && OB_ISNULL(sub.ptr()) && OB_NOT_NULL(text.ptr())) {
|
||||
is_null = true;
|
||||
} else {
|
||||
result = sub;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int ObExprRegexpSubstr::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const
|
||||
{
|
||||
int ret = OB_SUCCESS;
|
||||
CK(2 <= rt_expr.arg_cnt_ && rt_expr.arg_cnt_ <= 6);
|
||||
rt_expr.eval_func_ = &eval_regexp_substr;
|
||||
return ret;
|
||||
}
|
||||
|
||||
int ObExprRegexpSubstr::eval_regexp_substr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
|
||||
{
|
||||
int ret = OB_SUCCESS;
|
||||
ObDatum* text = NULL;
|
||||
ObDatum* pattern = NULL;
|
||||
ObDatum* position = NULL;
|
||||
ObDatum* occurrence = NULL;
|
||||
ObDatum* flags = NULL;
|
||||
ObDatum* subexpr = NULL;
|
||||
int64_t pos = 1;
|
||||
int64_t occur = 1;
|
||||
int64_t subexpr_val = 0;
|
||||
if (OB_FAIL(expr.eval_param_value(ctx, text, pattern, position, occurrence, flags, subexpr))) {
|
||||
LOG_WARN("evaluate parameters failed", K(ret));
|
||||
} else if (OB_FAIL(ObExprUtil::get_int_param_val(position, pos)) ||
|
||||
OB_FAIL(ObExprUtil::get_int_param_val(occurrence, occur)) ||
|
||||
OB_FAIL(ObExprUtil::get_int_param_val(subexpr, subexpr_val))) {
|
||||
LOG_WARN("get integer parameter value failed", K(ret));
|
||||
} else if (pos < 0 || occur <= 0 || subexpr_val < 0) {
|
||||
ret = OB_INVALID_ARGUMENT;
|
||||
LOG_WARN("regexp_substr position or occurrence or subexpr is invalid", K(ret), K(pos), K(occur), K(subexpr_val));
|
||||
} else {
|
||||
// %flags may be null
|
||||
bool is_flag_null = (NULL != flags && flags->is_null());
|
||||
const bool null_result = (text->is_null() || pattern->is_null() || (NULL != position && position->is_null()) ||
|
||||
(NULL != occurrence && occurrence->is_null()) ||
|
||||
(NULL != subexpr && subexpr->is_null()) || (share::is_mysql_mode() && is_flag_null));
|
||||
ObString match_param = (NULL != flags && !flags->is_null()) ? flags->get_string() : ObString();
|
||||
|
||||
ObString res;
|
||||
ObExprRegexContext regexp_ctx;
|
||||
ObIAllocator& alloc = ctx.get_reset_tmp_alloc();
|
||||
bool is_null = false;
|
||||
if (OB_FAIL(ret)) {
|
||||
} else if (share::is_mysql_mode() && !pattern->is_null() && pattern->get_string().empty() &&
|
||||
!is_flag_null) { // compatible mysql
|
||||
ret = OB_ERR_REGEXP_ERROR;
|
||||
LOG_WARN("empty regex expression", K(ret));
|
||||
} else if (OB_FAIL(calc(res,
|
||||
is_null,
|
||||
text->get_string(),
|
||||
pattern->get_string(),
|
||||
pos,
|
||||
occur,
|
||||
expr.datum_meta_.cs_type_,
|
||||
match_param,
|
||||
subexpr_val,
|
||||
null_result,
|
||||
®exp_ctx,
|
||||
alloc))) {
|
||||
LOG_WARN("calc failed", K(ret));
|
||||
} else if (null_result) {
|
||||
expr_datum.set_null();
|
||||
} else {
|
||||
if (is_null || (res.empty() && lib::is_oracle_mode() && !(expr.args_[0]->datum_meta_.is_clob()))) {
|
||||
expr_datum.set_null();
|
||||
} else if (res.empty() && lib::is_oracle_mode() && expr.args_[0]->datum_meta_.is_clob()) {
|
||||
expr_datum.set_string(ObString().ptr(), ObString().length());
|
||||
} else {
|
||||
ObExprStrResAlloc out_alloc(expr, ctx);
|
||||
ObString out;
|
||||
if (OB_FAIL(ObExprUtil::convert_string_collation(
|
||||
res, expr.args_[0]->datum_meta_.cs_type_, out, expr.datum_meta_.cs_type_, out_alloc))) {
|
||||
LOG_WARN("convert charset failed", K(ret));
|
||||
} else {
|
||||
if (out.ptr() == res.ptr()) {
|
||||
// res is allocated in temporary allocator, deep copy here.
|
||||
char* mem = expr.get_str_res_mem(ctx, res.length());
|
||||
if (OB_ISNULL(mem)) {
|
||||
ret = OB_ALLOCATE_MEMORY_FAILED;
|
||||
LOG_WARN("allocate memory failed", K(ret));
|
||||
} else {
|
||||
MEMCPY(mem, res.ptr(), res.length());
|
||||
expr_datum.set_string(mem, res.length());
|
||||
}
|
||||
} else {
|
||||
expr_datum.set_string(out.ptr(), out.length());
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
} // namespace sql
|
||||
} // namespace oceanbase
|
||||
Reference in New Issue
Block a user