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fix like expression bug

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This commit is contained in:
obdev
2022-11-09 08:08:09 +00:00
committed by wangzelin.wzl
parent 35bbe7fbda
commit 8e02660bcd
1 changed files with 19 additions and 14 deletions
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33
src/sql/engine/expr/ob_expr_like.cpp
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@ -732,35 +732,40 @@ int64_t ObExprLike::match_with_instr_mode(const ObString &text, const InstrInfo
const char **instr_pos = instr_info.instr_starts_;
const uint32_t *instr_len = instr_info.instr_lengths_;
bool match = true;
int64_t pos = 0;
int64_t end = percent_sign_end ? instr_info.instr_cnt_ : instr_info.instr_cnt_ - 1;
int64_t idx = 0;
int64_t idx_end = percent_sign_end ? instr_info.instr_cnt_ : instr_info.instr_cnt_ - 1;
// if not start with %, memcmp for first instr.
if (!percent_sign_start) {
int cmp = MEMCMP(text_ptr, instr_pos[0], instr_len[0]);
match = 0 == cmp;
text_ptr += instr_len[0];
pos++;
if (text_len < instr_len[0]) {
match = false;
} else {
int cmp = MEMCMP(text_ptr, instr_pos[0], instr_len[0]);
match = 0 == cmp;
text_ptr += instr_len[0];
text_len -= instr_len[0];
idx++;
}
}
// memmem for str surrounded by %
for (; pos < end && match; pos++) {
char *new_text = static_cast<char*>(MEMMEM(text_ptr, text_len, instr_pos[pos], instr_len[pos]));
text_len -= new_text != NULL ? new_text - text_ptr + instr_len[pos] : 0;
for (; idx < idx_end && match; idx++) {
char *new_text = static_cast<char*>(MEMMEM(text_ptr, text_len, instr_pos[idx], instr_len[idx]));
text_len -= new_text != NULL ? new_text - text_ptr + instr_len[idx] : 0;
if (OB_UNLIKELY(text_len < 0)) {
match = false;
LOG_ERROR("unexpected result of memmem", K(text),
K(ObString(instr_len[pos], instr_pos[pos])));
K(ObString(instr_len[idx], instr_pos[idx])));
} else {
match = new_text != NULL;
text_ptr = new_text + instr_len[pos];
text_ptr = new_text + instr_len[idx];
}
}
// if not end with %, memcmp for last instr
if (match && !percent_sign_end) {
if (text_len < instr_len[pos]) {
if (text_len < instr_len[idx]) {
match = false;
} else {
match = 0 == MEMCMP(text.ptr() + text.length() - instr_len[pos],
instr_pos[pos], instr_len[pos]);
match = 0 == MEMCMP(text.ptr() + text.length() - instr_len[idx],
instr_pos[idx], instr_len[idx]);
}
}
res = match ? 1 : 0;