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MXS-1621: Skip unneeded ALTER TABLE operations

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Some ALTER TABLE operations (e.g. ADD INDEX) are not useful to the
avrorouter. These need to be detected and skipped.
This commit is contained in:
Markus Mäkelä
2018-01-29 14:05:52 +02:00
parent e14710ab2b
commit 93923acafb
3 changed files with 82 additions and 5 deletions
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37
server/modules/routing/avrorouter/avro_file.c
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@ -1021,6 +1021,40 @@ void unify_whitespace(char *sql, int len)
}
}
/**
* A very simple function for stripping auto-generated executable comments
*
* Note that the string will not strip the trailing part of the comment, making
* the SQL invalid.
*
* @param sql String to modify
* @param len Pointer to current length of string, updated to new length if
* @c sql is modified
*/
static void strip_executable_comments(char *sql, int* len)
{
if (strncmp(sql, "/*!", 3) == 0 || strncmp(sql, "/*M!", 4) == 0)
{
// Executable comment, remove it
char* p = sql + 3;
if (*p == '!')
{
p++;
}
// Skip the versioning part
while (*p && isdigit(*p))
{
p++;
}
int n_extra = p - sql;
int new_len = *len - n_extra;
memmove(sql, sql + n_extra, new_len);
*len = new_len;
}
}
/**
* @brief Handling of query events
*
@ -1046,6 +1080,7 @@ void handle_query_event(AVRO_INSTANCE *router, REP_HEADER *hdr, int *pending_tra
sql = tmp;
len = tmpsz;
unify_whitespace(sql, len);
strip_executable_comments(sql, &len);
sql[len] = '\0';
static bool warn_not_row_format = true;
@ -1107,7 +1142,7 @@ void handle_query_event(AVRO_INSTANCE *router, REP_HEADER *hdr, int *pending_tra
}
else
{
MXS_ERROR("Alter statement to a table with no create statement.");
MXS_ERROR("Alter statement to table '%s' has no preceding create statement.", ident);
}
}
/* A transaction starts with this event */