295 lines
11 KiB
C++
295 lines
11 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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*/
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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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{
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namespace sql
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{
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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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}
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ObExprRegexpLike::~ObExprRegexpLike()
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{
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}
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int ObExprRegexpLike::calc_result_typeN(ObExprResType &type,
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ObExprResType *types,
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int64_t param_num,
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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(
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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 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::regexp_like(bool &match,
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const ObString &text,
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const ObString &pattern,
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int64_t position,
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int64_t occurrence,
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const ObCollationType calc_cs_type,
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const ObString &match_param,
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bool has_null_argument,
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bool reusable,
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ObExprRegexContext* regexp_ptr,
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ObExprStringBuf &string_buf,
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ObIAllocator &exec_ctx_alloc)
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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,
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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 (OB_FAIL(ObExprRegexpCount::get_regexp_flags(calc_cs_type, match_param,
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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,
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reusable ? exec_ctx_alloc : string_buf,
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reusable))) {
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LOG_WARN("fail to init regexp", K(pattern), K(flags));
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}
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if (OB_SUCC(ret)) {
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//为了更好的和oracle兼容
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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(text,
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ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4),
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byte_num,
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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(regexp_like_ctx->like(text, occurrence, sub, string_buf,
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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,
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const ObString &text,
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const ObString &pattern,
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int64_t position,
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int64_t occurrence,
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const ObString &match_param,
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bool has_null,
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ObExprRegexContext* regexp_ptr,
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ObExprStringBuf &string_buf,
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ObIAllocator &exec_ctx_alloc) 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, text, pattern, position, occurrence,
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result_type_.get_calc_collation_type(),
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match_param, has_null, false, regexp_ptr, string_buf, exec_ctx_alloc))) {
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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 &op_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(op_cg_ctx);
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CK(2 == rt_expr.arg_cnt_ || 3 == rt_expr.arg_cnt_);
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CK(raw_expr.get_param_count() >= 2);
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if (OB_SUCC(ret)) {
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const ObRawExpr *text = raw_expr.get_param_expr(0);
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const ObRawExpr *pattern = raw_expr.get_param_expr(1);
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if (OB_ISNULL(text) || OB_ISNULL(pattern)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected null", K(text), K(pattern), K(ret));
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} else {
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const bool const_text = text->is_const_expr();
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const bool const_pattern = pattern->is_const_expr();
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rt_expr.extra_ = (!const_text && const_pattern) ? 1 : 0;
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rt_expr.eval_func_ = &eval_regexp_like;
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LOG_DEBUG("regexp like expr cg", K(const_text), K(const_pattern), K(rt_expr.extra_));
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}
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}
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return ret;
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}
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int ObExprRegexpLike::eval_regexp_like(
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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() ||
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(lib::is_mysql_mode() && is_flag_null));
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ObString match_param = (NULL != flags && !flags->is_null())
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? flags->get_string()
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: ObString();
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const int64_t pos = 1;
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const int64_t occurrence = 1;
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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ObIAllocator &alloc = alloc_guard.get_allocator();
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bool match = false;
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ObExprRegexContext local_regex_ctx;
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ObExprRegexContext *regexp_ctx = &local_regex_ctx;
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const bool reusable = (0 != expr.extra_) && ObExpr::INVALID_EXP_CTX_ID != expr.expr_ctx_id_;
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if (OB_SUCC(ret) && reusable) {
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if (NULL == (regexp_ctx = static_cast<ObExprRegexContext *>(
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ctx.exec_ctx_.get_expr_op_ctx(expr.expr_ctx_id_)))) {
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if (OB_FAIL(ctx.exec_ctx_.create_expr_op_ctx(expr.expr_ctx_id_, regexp_ctx))) {
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LOG_WARN("create expr regex context failed", K(ret), K(expr));
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} else if (OB_ISNULL(regexp_ctx)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("NULL context returned", K(ret));
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}
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}
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}
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if (OB_FAIL(ret)) {
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} else if (lib::is_mysql_mode() && !pattern->is_null() &&
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pattern->get_string().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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} else if (OB_FAIL(regexp_like(match, text->get_string(), pattern->get_string(), pos,
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occurrence, expr.args_[0]->datum_meta_.cs_type_, match_param,
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null_result, reusable, regexp_ctx, alloc,
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ctx.exec_ctx_.get_allocator()))) {
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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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}
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}
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