336 lines
12 KiB
C++
336 lines
12 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_count.h"
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#include "lib/oblog/ob_log.h"
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#include "lib/number/ob_number_v2.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/engine/expr/ob_expr_util.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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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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ObExprRegexpCount::ObExprRegexpCount(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_REGEXP_COUNT, N_REGEXP_COUNT, MORE_THAN_ONE, NOT_ROW_DIMENSION)
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{
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}
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ObExprRegexpCount::~ObExprRegexpCount()
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{
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}
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int ObExprRegexpCount::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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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 > 4)) {
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ret = OB_ERR_PARAM_SIZE;
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LOG_WARN("param number of regexp_count at least 2 and at most 4", 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 (OB_SUCC(ret)) {
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switch (param_num) {//because of regexp engine need utf8 code, here need reset calc collation type and can implicit cast.
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case 4:
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types[3].set_calc_type(ObVarcharType);
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case 3:
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types[2].set_calc_type(ObNumberType);
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case 2:
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types[1].set_calc_type(ObVarcharType);
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types[1].set_calc_collation_type(ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4));
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if (!types[0].is_clob()) {
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types[0].set_calc_type(ObVarcharType);
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types[0].set_calc_collation_type(ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4));
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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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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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type.set_number();
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type.set_precision(PRECISION_UNKNOWN_YET);
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type.set_scale(NUMBER_SCALE_UNKNOWN_YET);
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}
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}
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return ret;
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}
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int ObExprRegexpCount::calc(int64_t &ret_count,
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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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ObCollationType calc_cs_type,
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const ObString &match_param,
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int64_t subexpr,
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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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//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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int64_t sub = 0;
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ret_count = 0;
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ObExprRegexContext *regexp_count_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_count_ctx)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("regexp_count_ctx is null", K(ret));
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} else if (OB_FAIL(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_count_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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/*do nothing*/
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} else if (lib::is_mysql_mode() && pattern.empty()) {
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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 {
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if (OB_NOT_NULL(pattern)) {
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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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ret_count = 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_count_ctx->count_match_str(text, subexpr, sub, string_buf, from_begin,
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from_end, begin_locations))) {
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LOG_WARN("fail to get count_match_str", K(ret), K(text), K(pattern),
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K(match_param), K(flags), K(subexpr));
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} else {
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ret_count = 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 ObExprRegexpCount::get_regexp_flags(const common::ObCollationType calc_cs_type,
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const ObString &match_param, int& flags,
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int &multi_flag)
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{
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int ret = OB_SUCCESS;
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int n_flag = 1;
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int m_flag = 0;
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const char *ptr = match_param.ptr();
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int length = match_param.length();
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flags = OB_REG_EXTENDED | OB_REG_NLSTOP | OB_REG_NEWLINE;
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if (lib::is_oracle_mode()) {
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flags |= OB_REG_ORACLE_MODE;
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} else {
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flags &= ~OB_REG_ORACLE_MODE;
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}
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if (!ObCharset::is_bin_sort(calc_cs_type)) {
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flags |= OB_REG_ICASE;
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}
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for (int i = 0; OB_SUCC(ret) && i < length; i++) {
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char c = ptr[i];
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switch (c) {
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case 'i':
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flags |= OB_REG_ICASE;
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break;
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case 'c':
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flags &= ~OB_REG_ICASE;
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break;
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case 'n':
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flags &= ~OB_REG_NLSTOP;
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n_flag = 0;
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break;
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case 'm':
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flags &= ~OB_REG_NLSTOP;
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flags |= OB_REG_NEWLINE;
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flags |= OB_REG_NLANCH;
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m_flag = 1;
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break;
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case 'x':
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if (lib::is_oracle_mode()) {//compatible oracle
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flags |= OB_REG_EXPANDED;
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} else {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid match_param", K(match_param));
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}
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break;
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case 'u':
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if (lib::is_mysql_mode()) {//compatible oracle
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flags |= OB_REG_NEWLINE;
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} else {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid match_param", K(match_param));
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}
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break;
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default:
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid match_param", K(match_param));
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}
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}
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if (OB_SUCC(ret)) {
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multi_flag = m_flag & n_flag;
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if (m_flag == 1 && n_flag == 0) {
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flags &= ~OB_REG_NEWLINE;
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flags &= ~OB_REG_NLANCH;
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}
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}
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return ret;
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}
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int ObExprRegexpCount::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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// regex_count is oracle only expr
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UNUSED(op_cg_ctx);
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CK(lib::is_oracle_mode());
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CK(2 <= rt_expr.arg_cnt_ && rt_expr.arg_cnt_ <= 4);
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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_count;
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LOG_TRACE("regexp count 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 ObExprRegexpCount::eval_regexp_count(
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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 *position = NULL;
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ObDatum *flags = NULL;
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if (OB_FAIL(expr.eval_param_value(ctx, text, pattern, position, 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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const bool null_result = (text->is_null() || pattern->is_null()
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|| (NULL != position && position->is_null()) ||
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(lib::is_mysql_mode() && NULL != flags && flags->is_null()));
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int64_t pos = 1;
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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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if (OB_FAIL(ObExprUtil::get_int_param_val(position, pos))) {
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LOG_WARN("truncate number to int64 failed", K(ret));
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} else if (pos <= 0) {
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ret = OB_ERR_ARGUMENT_OUT_OF_RANGE;
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LOG_WARN("position out of range", K(ret), K(position), K(pos));
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}
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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ObIAllocator &alloc = alloc_guard.get_allocator();
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ObNumStackOnceAlloc num_alloc;
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number::ObNumber num;
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int64_t subexpr = 0;
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int64_t cnt = 0;
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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 (OB_FAIL(calc(cnt, text->get_string(), pattern->get_string(), pos,
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expr.args_[0]->datum_meta_.cs_type_,
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match_param, subexpr, null_result, reusable, regexp_ctx, alloc,
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ctx.exec_ctx_.get_allocator()))) {
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LOG_WARN("calc regex count failed", K(ret));
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} else if (null_result) {
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expr_datum.set_null();
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} else if (OB_FAIL(num.from(cnt, num_alloc))) {
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LOG_WARN("convert int to number failed", K(ret));
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} else {
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expr_datum.set_number(num);
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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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