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Add the built-in affinity() SQL function.

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FossilOrigin-Name: 57e40e1cb1bcd3dd8473d2fdeecc9c7ff3d6192b
This commit is contained in:
drh
2016-12-26 00:18:36 +00:00
parent beaf514e23
commit a1a523a5bb
5 changed files with 28 additions and 9 deletions
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14
src/expr.c
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@@ -3621,6 +3621,20 @@ int sqlite3ExprCodeTarget(Parse *pParse, Expr *pExpr, int target){
return sqlite3ExprCodeTarget(pParse, pFarg->a[0].pExpr, target);
}
/* The AFFINITY() function evaluates to a string that describes
** the type affinity of the argument. This is used for testing of
** the SQLite type logic.
*/
if( pDef->funcFlags & SQLITE_FUNC_AFFINITY ){
const char *azAff[] = { "blob", "text", "numeric", "integer", "real" };
char aff;
assert( nFarg==1 );
aff = sqlite3ExprAffinity(pFarg->a[0].pExpr);
sqlite3VdbeLoadString(v, target,
aff ? azAff[aff-SQLITE_AFF_BLOB] : "none");
return target;
}
for(i=0; i<nFarg; i++){
if( i<32 && sqlite3ExprIsConstant(pFarg->a[i].pExpr) ){
testcase( i==31 );