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Special handling of the NULL keyword. Sometimes it is a literal, and sometimes

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it is a keyword.

FossilOrigin-Name: db5d138e97f22ad4d4d11dbef96df93696ba0e557809066bc263ca3c3898f349
This commit is contained in:
drh
2018-01-08 19:29:28 +00:00
parent ef42481224
commit d19866bb98
3 changed files with 18 additions and 7 deletions
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11
ext/misc/normalize.c
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@ -573,6 +573,17 @@ char *sqlite3_normalize(const char *zSql){
}
case TK_PUNCT:
case TK_NAME: {
if( n==4 && sqlite3_strnicmp(zSql+i,"NULL",4)==0 ){
if( (j>=3 && strncmp(z+j-2,"is",2)==0 && !IdChar(z[j-3]))
|| (j>=4 && strncmp(z+j-3,"not",3)==0 && !IdChar(z[j-4]))
){
/* NULL is a keyword in this case, not a literal value */
}else{
/* Here the NULL is a literal value */
z[j++] = '?';
break;
}
}
if( j>0 && IdChar(z[j-1]) && IdChar(zSql[i]) ) z[j++] = ' ';
for(k=0; k<n; k++){
z[j++] = sqlite3Tolower(zSql[i+k]);