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MXS-2398 Handle MariaDB specific comments

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Same approach as with regular comments:
- /*M! STMT */ are always parsed.
- /*M!###### STMT */ are never parsed.
This commit is contained in:
Johan Wikman
2019-03-21 10:06:15 +02:00
parent 2c4228db47
commit 559b786533
1 changed files with 12 additions and 6 deletions
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18
query_classifier/qc_sqlite/sqlite-src-3110100/src/tokenize.c
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@ -255,21 +255,27 @@ int sqlite3GetToken(const unsigned char *z, int *tokenType){
return 1;
}
#ifdef MAXSCALE
if ( z[2] == '!' ){
if ( z[2]=='!' || (z[2]=='M' && z[3]=='!')){
int j = (z[2]=='M' ? 4 : 3);
// MySQL-specific code
for (i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
for (i=j, c=z[j-1]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
if (c=='*' && z[i]=='/'){
if (sqlite3Isdigit(z[3])) {
// A version specific executable comment, e.g. "/*!99999 ..." => never parsed.
if (sqlite3Isdigit(z[j])) {
// A version specific executable comment,
// e.g. "/*!99999 ..." or "/*M!99999 ..." => never parsed.
extern void maxscaleSetStatusCap(int);
maxscaleSetStatusCap(2); // QC_QUERY_PARTIALLY_PARSED, see query_classifier.h:qc_parse_result
++i; // Next after the trailing '/'
}
else {
// A non-version specific executable comment, e.g. "/*! select 1 */ => always parsed.
// A non-version specific executable comment,
// e.g."/*! select 1 */ or "/*M! select 1 */ => always parsed.
char* znc = (char*) z;
znc[0]=znc[1]=znc[2]=znc[i-1]=znc[i]=' '; // Remove comment chars, i.e. "/*!" and "*/".
for (i=3; sqlite3Isspace(z[i]); ++i){} // Jump over any space.
if (j==4){
znc[3]=0; // It wasn't "/*!" but "/*M!".
}
for (i=j; sqlite3Isspace(z[i]); ++i){} // Jump over any space.
}
}
} else {