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Evaluate typeof(X) and length(Y) where X is any column and Y is a blob column

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without actually loading X and Y from disk.

FossilOrigin-Name: b899dbeb60752843287e2c6ad3577e1d00f0d587
This commit is contained in:
drh
2012-03-28 01:34:47 +00:00
parent cd217e7397
commit a748fdcc43
11 changed files with 148 additions and 51 deletions
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src/func.c
+4 -6
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@@ -1542,8 +1542,8 @@ void sqlite3RegisterGlobalFunctions(void){
FUNCTION(max, -1, 1, 1, minmaxFunc ),
FUNCTION(max, 0, 1, 1, 0 ),
AGGREGATE(max, 1, 1, 1, minmaxStep, minMaxFinalize ),
FUNCTION(typeof, 1, 0, 0, typeofFunc ),
FUNCTION(length, 1, 0, 0, lengthFunc ),
FUNCTION2(typeof, 1, 0, 0, typeofFunc, SQLITE_FUNC_TYPEOF),
FUNCTION2(length, 1, 0, 0, lengthFunc, SQLITE_FUNC_LENGTH),
FUNCTION(substr, 2, 0, 0, substrFunc ),
FUNCTION(substr, 3, 0, 0, substrFunc ),
FUNCTION(abs, 1, 0, 0, absFunc ),
@@ -1555,11 +1555,9 @@ void sqlite3RegisterGlobalFunctions(void){
FUNCTION(lower, 1, 0, 0, lowerFunc ),
FUNCTION(coalesce, 1, 0, 0, 0 ),
FUNCTION(coalesce, 0, 0, 0, 0 ),
/* FUNCTION(coalesce, -1, 0, 0, ifnullFunc ), */
{-1,SQLITE_UTF8,SQLITE_FUNC_COALESCE,0,0,ifnullFunc,0,0,"coalesce",0,0},
FUNCTION2(coalesce, -1, 0, 0, ifnullFunc, SQLITE_FUNC_COALESCE),
FUNCTION(hex, 1, 0, 0, hexFunc ),
/* FUNCTION(ifnull, 2, 0, 0, ifnullFunc ), */
{2,SQLITE_UTF8,SQLITE_FUNC_COALESCE,0,0,ifnullFunc,0,0,"ifnull",0,0},
FUNCTION2(ifnull, 2, 0, 0, ifnullFunc, SQLITE_FUNC_COALESCE),
FUNCTION(random, 0, 0, 0, randomFunc ),
FUNCTION(randomblob, 1, 0, 0, randomBlob ),
FUNCTION(nullif, 2, 0, 1, nullifFunc ),