119 lines
4.7 KiB
C++
119 lines
4.7 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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#include "share/ob_worker.h"
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#include "storage/ob_query_iterator_util.h"
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namespace oceanbase {
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using namespace common;
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namespace storage {
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int pad_column(const ObAccuracy accuracy, common::ObIAllocator& padding_alloc, common::ObObj& cell)
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{
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int ret = OB_SUCCESS;
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if (cell.is_fixed_len_char_type()) {
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char* buf = NULL;
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ObLength length = accuracy.get_length(); // byte or char length
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int32_t cell_strlen = 0; // byte or char length
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int32_t pad_whitespace_length = 0; // pad whitespace length
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ObString space_pattern = ObCharsetUtils::get_const_str(cell.get_collation_type(), OB_PADDING_CHAR);
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if (OB_FAIL(cell.get_char_length(accuracy, cell_strlen, share::is_oracle_mode()))) {
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STORAGE_LOG(WARN, "Fail to get char length, ", K(ret));
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} else {
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if (cell_strlen < length) {
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pad_whitespace_length = length - cell_strlen;
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if (ObCharset::is_cs_nonascii(cell.get_collation_type())) {
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pad_whitespace_length *= space_pattern.length();
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}
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}
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if (pad_whitespace_length > 0) {
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int32_t buf_len = cell.get_val_len() + pad_whitespace_length;
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if (NULL == (buf = (char*)padding_alloc.alloc(buf_len))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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STORAGE_LOG(ERROR, "no memory", K(ret));
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} else {
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MEMMOVE(buf, cell.get_string_ptr(), cell.get_val_len());
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if (ObCharset::is_cs_nonascii(cell.get_collation_type())) {
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for (int32_t len_i = cell.get_val_len(); len_i + space_pattern.length() <= buf_len;
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len_i += space_pattern.length()) {
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MEMCPY(buf + len_i, space_pattern.ptr(), space_pattern.length());
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}
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STORAGE_LOG(DEBUG, "multi-byte padding", K(pad_whitespace_length), K(cell));
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} else {
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MEMSET(buf + cell.get_val_len(), OB_PADDING_CHAR, pad_whitespace_length);
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}
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// watch out !!! in order to deep copy an ObObj instance whose type is char or varchar,
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// set_collation_type() should be revoked. But here no need to set collation type
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cell.set_string(cell.get_type(), ObString(buf_len, buf_len, buf));
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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 pad_column(const common::ObAccuracy accuracy, sql::ObEvalCtx& ctx, sql::ObExpr* expr)
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{
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int ret = OB_SUCCESS;
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sql::ObDatum* datum = NULL;
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if (OB_ISNULL(expr)) {
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ret = OB_INVALID_ARGUMENT;
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STORAGE_LOG(WARN, "invalid argument", K(ret));
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} else if ((datum = &expr->locate_expr_datum(ctx))->is_null()) {
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// do nothing.
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} else if (expr->obj_meta_.is_fixed_len_char_type()) {
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ObCollationType cs_type = expr->datum_meta_.cs_type_;
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ObLength length = accuracy.get_length(); // byte or char length
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int32_t cur_len = 0; // byte or char length
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int32_t pad_whitespace_length = 0; // pad whitespace length
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ObString space_pattern = ObCharsetUtils::get_const_str(cs_type, OB_PADDING_CHAR);
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if (is_oracle_byte_length(share::is_oracle_mode(), accuracy.get_length_semantics())) {
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cur_len = datum->len_;
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} else {
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cur_len = static_cast<int32_t>(ObCharset::strlen_char(cs_type, datum->ptr_, datum->len_));
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}
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if (cur_len < length) {
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pad_whitespace_length = length - cur_len;
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if (ObCharset::is_cs_nonascii(cs_type)) {
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pad_whitespace_length *= space_pattern.length();
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}
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}
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if (pad_whitespace_length > 0) {
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const char* old = datum->ptr_;
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const int32_t buf_len = datum->len_ + pad_whitespace_length;
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char* buf = expr->get_str_res_mem(ctx, buf_len);
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if (OB_ISNULL(buf)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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STORAGE_LOG(ERROR, "no memory", K(ret));
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} else {
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MEMMOVE(buf, old, datum->len_);
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if (ObCharset::is_cs_nonascii(cs_type)) {
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for (int32_t len_i = datum->len_; len_i + space_pattern.length() <= buf_len;
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len_i += space_pattern.length()) {
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MEMCPY(buf + len_i, space_pattern.ptr(), space_pattern.length());
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}
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} else {
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MEMSET(buf + datum->len_, OB_PADDING_CHAR, pad_whitespace_length);
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}
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datum->ptr_ = buf;
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datum->len_ = buf_len;
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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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} // namespace storage
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} // namespace oceanbase
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