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src/sql/engine/expr/ob_expr_regexp_like.cpp
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316
src/sql/engine/expr/ob_expr_regexp_like.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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#define USING_LOG_PREFIX SQL_ENG
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#include "sql/engine/expr/ob_expr_regexp_like.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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ObExprRegexpLike::ObExprRegexpLike(ObIAllocator& alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_REGEXP_LIKE, N_REGEXP_LIKE, MORE_THAN_ONE, NOT_ROW_DIMENSION)
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{}
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ObExprRegexpLike::~ObExprRegexpLike()
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{}
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int ObExprRegexpLike::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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} else if (OB_UNLIKELY(param_num < 2 || param_num > 3)) {
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ret = OB_ERR_PARAM_SIZE;
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LOG_WARN("param number of regexp_replace at least 2 and at most 3", 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()) { // set default value
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type.set_calc_type(ObVarcharType);
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type.set_calc_collation_type(ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4));
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type.set_calc_collation_level(CS_LEVEL_IMPLICIT);
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} else {
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ObObjMeta type_metas[2] = {types[0], types[1]};
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if (OB_FAIL(aggregate_charsets_for_comparison(type.get_calc_meta(), type_metas, 2, type_ctx.get_coll_type()))) {
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LOG_WARN("fail to aggregate charsets for comparison", K(ret), K(types[0]), K(types[1]));
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}
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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 3:
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types[2].set_calc_type(ObVarcharType);
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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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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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}
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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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if (OB_SUCC(ret)) {
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type.set_tinyint();
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type.set_precision(DEFAULT_PRECISION_FOR_BOOL);
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type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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ObExprOperator::calc_result_flag2(type, types[0], types[1]);
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}
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}
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return ret;
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}
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int ObExprRegexpLike::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;
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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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// optional params is null, use default flags
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if (objs[i].is_null()) {
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if (share::is_oracle_mode() && i == 2) { // compatible oracle
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} else {
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has_null = true;
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is_flag_null = (i == 2);
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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 3:
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if (!objs[2].is_null()) {
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TYPE_CHECK(objs[2], ObVarcharType);
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match_param = objs[2].get_string();
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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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}
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ObExprRegexContext regexp_obj;
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if (OB_SUCC(ret)) {
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if (OB_FAIL(calc(
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result, text, pattern, position, occurrence, match_param, has_null, ®exp_obj, *expr_ctx.calc_buf_))) {
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LOG_WARN("fail to cacl regexp_like", K(ret), K(text), K(pattern), K(occurrence), K(match_param));
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}
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if (OB_LIKELY(OB_SUCCESS == ret && !result.is_null())) {
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result.set_collation(result_type_);
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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 ObExprRegexpLike::regexp_like(bool& match, const ObString& text, const ObString& pattern, int64_t position,
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int64_t occurrence, const ObCollationType calc_cs_type, const ObString& match_param, bool has_null_argument,
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ObExprRegexContext* regexp_ptr, ObExprStringBuf& string_buf)
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{
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int ret = OB_SUCCESS;
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bool sub = false;
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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_like_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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if (OB_ISNULL(regexp_like_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_like_ctx->is_inited()) {
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const bool reusable = false;
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if (OB_FAIL(ObExprRegexpCount::get_regexp_flags(calc_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_like_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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match = false;
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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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}
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}
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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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match = sub;
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} else {
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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) {
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if (from_begin && 1 != position) {
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begin_locations.pop_back();
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}
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const char* text_ptr = text.ptr();
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for (int64_t idx = position; OB_SUCC(ret) && idx < byte_offsets.count() - 1; ++idx) {
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if (OB_UNLIKELY(byte_offsets.at(idx) >= text.length())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected error", K(byte_offsets.at(idx)), K(text.length()), K(ret));
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} else if (text_ptr[byte_offsets.at(idx)] == '\n') {
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if (OB_FAIL(begin_locations.push_back(idx + 1))) {
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LOG_WARN("begin_locations push_back error", K(ret));
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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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if (OB_FAIL(
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regexp_like_ctx->like(text, occurrence, sub, string_buf, from_begin, from_end, begin_locations))) {
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LOG_WARN("fail to replace substr", K(ret), K(text));
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} else {
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match = sub;
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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 ObExprRegexpLike::calc(common::ObObj& result, const ObString& text, const ObString& pattern, int64_t position,
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int64_t occurrence, const ObString& match_param, bool has_null, ObExprRegexContext* regexp_ptr,
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ObExprStringBuf& string_buf) const
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{
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int ret = OB_SUCCESS;
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bool match = false;
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if (OB_FAIL(regexp_like(match,
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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_calc_collation_type(),
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match_param,
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has_null,
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regexp_ptr,
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string_buf))) {
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LOG_WARN("regexp like failed", K(ret));
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} else {
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result.set_int(result_type_.get_type(), static_cast<int64_t>(match));
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}
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return ret;
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}
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int ObExprRegexpLike::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const
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{
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int ret = OB_SUCCESS;
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CK(2 == rt_expr.arg_cnt_ || 3 == rt_expr.arg_cnt_);
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rt_expr.eval_func_ = &eval_regexp_like;
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return ret;
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}
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int ObExprRegexpLike::eval_regexp_like(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum* text = NULL;
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ObDatum* pattern = NULL;
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ObDatum* flags = NULL;
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if (OB_FAIL(expr.eval_param_value(ctx, text, pattern, flags))) {
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LOG_WARN("evaluate parameters failed", K(ret));
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} else {
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// use default flags if NULL == flags and flags->is_null()
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bool is_flag_null = (NULL != flags && flags->is_null());
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const bool null_result = (text->is_null() || pattern->is_null() || (share::is_mysql_mode() && is_flag_null));
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ObString match_param = (NULL != flags && !flags->is_null()) ? flags->get_string() : ObString();
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const int64_t pos = 1;
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const int64_t occurrence = 1;
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ObExprRegexContext regexp_ctx;
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ObIAllocator& alloc = ctx.get_reset_tmp_alloc();
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bool match = false;
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if (share::is_mysql_mode() && !pattern->is_null() && pattern->get_string().empty() &&
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!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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} else if (OB_FAIL(regexp_like(match,
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text->get_string(),
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pattern->get_string(),
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pos,
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occurrence,
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expr.args_[0]->datum_meta_.cs_type_,
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match_param,
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null_result,
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®exp_ctx,
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alloc))) {
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LOG_WARN("do regexp like failed", K(ret));
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} else if (null_result) {
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expr_datum.set_null();
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} else {
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expr_datum.set_int32(match);
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}
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}
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return ret;
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}
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} // namespace sql
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} // namespace oceanbase
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