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Add support for "ROWS BETWEEN <expr> PRECEDING AND <expr> FOLLOWING" window

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frames.

FossilOrigin-Name: 3a203660f1e4da3b8d2d605c494f4843f6e00752f28042b49e11d7d6550dd406
This commit is contained in:
dan
2018-05-23 20:55:37 +00:00
parent 72779425b5
commit c3a20c19a8
11 changed files with 452 additions and 137 deletions
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src/func.c
+25 -4
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@@ -1513,6 +1513,27 @@ static void sumStep(sqlite3_context *context, int argc, sqlite3_value **argv){
}
}
}
static void sumInverse(sqlite3_context *context, int argc, sqlite3_value**argv){
SumCtx *p;
int type;
assert( argc==1 );
UNUSED_PARAMETER(argc);
p = sqlite3_aggregate_context(context, sizeof(*p));
type = sqlite3_value_numeric_type(argv[0]);
if( p && type!=SQLITE_NULL ){
p->cnt--;
if( type==SQLITE_INTEGER ){
i64 v = sqlite3_value_int64(argv[0]);
p->rSum -= v;
if( (p->approx|p->overflow)==0 && sqlite3AddInt64(&p->iSum, -1*v) ){
p->overflow = 1;
}
}else{
p->rSum += sqlite3_value_double(argv[0]);
p->approx = 1;
}
}
}
static void sumFinalize(sqlite3_context *context){
SumCtx *p;
p = sqlite3_aggregate_context(context, 0);
@@ -1873,12 +1894,12 @@ void sqlite3RegisterBuiltinFunctions(void){
FUNCTION(zeroblob, 1, 0, 0, zeroblobFunc ),
FUNCTION(substr, 2, 0, 0, substrFunc ),
FUNCTION(substr, 3, 0, 0, substrFunc ),
WAGGREGATE(sum, 1, 0, 0, sumStep, sumFinalize),
WAGGREGATE(total, 1, 0, 0, sumStep, totalFinalize ),
WAGGREGATE(avg, 1, 0, 0, sumStep, avgFinalize ),
WAGGREGATE(sum, 1, 0, 0, sumStep, sumInverse, sumFinalize),
WAGGREGATE(total, 1, 0, 0, sumStep, sumInverse, totalFinalize ),
WAGGREGATE(avg, 1, 0, 0, sumStep, sumInverse, avgFinalize ),
AGGREGATE2(count, 0, 0, 0, countStep, countFinalize,
SQLITE_FUNC_COUNT ),
WAGGREGATE(count, 1, 0, 0, countStep, countFinalize ),
WAGGREGATE(count, 1, 0, 0, countStep, 0, countFinalize ),
AGGREGATE(group_concat, 1, 0, 0, groupConcatStep, groupConcatFinalize,
groupConcatValue),
AGGREGATE(group_concat, 2, 0, 0, groupConcatStep, groupConcatFinalize,