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Overview
| Comment: | Get the json_group_array() and json_group_object() SQL functions working as window functions. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
916cdc83f5a45e0b6f61c52ff5fde70d |
| User & Date: | drh 2018-07-05 20:05:29 |
Context
|
2018-07-05
| ||
| 20:33 | Update the recipe for resetting a database using SQLITE_DBCONFIG_RESET_DATABASE. check-in: c43dd23f user: dan tags: trunk | |
| 20:05 | Get the json_group_array() and json_group_object() SQL functions working as window functions. check-in: 916cdc83 user: drh tags: trunk | |
| 18:34 | Return an error if a "RANGE" window-frame uses "<expr> PRECEDING" or "<expr> FOLLOWING". check-in: 786c87ba user: dan tags: trunk | |
Changes
Changes to ext/misc/json1.c.
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}else{
jsonAppendChar(pStr, ',');
pStr->pCtx = ctx;
}
jsonAppendValue(pStr, argv[0]);
}
}
static void jsonArrayFinal(sqlite3_context *ctx){
JsonString *pStr;
pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
if( pStr ){
pStr->pCtx = ctx;
jsonAppendChar(pStr, ']');
if( pStr->bErr ){
if( pStr->bErr==1 ) sqlite3_result_error_nomem(ctx);
assert( pStr->bStatic );
}else{
sqlite3_result_text(ctx, pStr->zBuf, pStr->nUsed,
pStr->bStatic ? SQLITE_TRANSIENT : sqlite3_free);
pStr->bStatic = 1;
}
}else{
sqlite3_result_text(ctx, "[]", 2, SQLITE_STATIC);
}
sqlite3_result_subtype(ctx, JSON_SUBTYPE);
}
/*
** json_group_obj(NAME,VALUE)
**
** Return a JSON object composed of all names and values in the aggregate.
*/
static void jsonObjectStep(
................................................................................
z = (const char*)sqlite3_value_text(argv[0]);
n = (u32)sqlite3_value_bytes(argv[0]);
jsonAppendString(pStr, z, n);
jsonAppendChar(pStr, ':');
jsonAppendValue(pStr, argv[1]);
}
}
static void jsonObjectFinal(sqlite3_context *ctx){
JsonString *pStr;
pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
if( pStr ){
jsonAppendChar(pStr, '}');
if( pStr->bErr ){
if( pStr->bErr==1 ) sqlite3_result_error_nomem(ctx);
assert( pStr->bStatic );
}else{
sqlite3_result_text(ctx, pStr->zBuf, pStr->nUsed,
pStr->bStatic ? SQLITE_TRANSIENT : sqlite3_free);
pStr->bStatic = 1;
}
}else{
sqlite3_result_text(ctx, "{}", 2, SQLITE_STATIC);
}
sqlite3_result_subtype(ctx, JSON_SUBTYPE);
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
/****************************************************************************
** The json_each virtual table
****************************************************************************/
typedef struct JsonEachCursor JsonEachCursor;
................................................................................
#endif
};
static const struct {
const char *zName;
int nArg;
void (*xStep)(sqlite3_context*,int,sqlite3_value**);
void (*xFinal)(sqlite3_context*);
} aAgg[] = {
{ "json_group_array", 1, jsonArrayStep, jsonArrayFinal },
{ "json_group_object", 2, jsonObjectStep, jsonObjectFinal },
};
#ifndef SQLITE_OMIT_VIRTUALTABLE
static const struct {
const char *zName;
sqlite3_module *pModule;
} aMod[] = {
{ "json_each", &jsonEachModule },
................................................................................
for(i=0; i<sizeof(aFunc)/sizeof(aFunc[0]) && rc==SQLITE_OK; i++){
rc = sqlite3_create_function(db, aFunc[i].zName, aFunc[i].nArg,
SQLITE_UTF8 | SQLITE_DETERMINISTIC,
(void*)&aFunc[i].flag,
aFunc[i].xFunc, 0, 0);
}
for(i=0; i<sizeof(aAgg)/sizeof(aAgg[0]) && rc==SQLITE_OK; i++){
rc = sqlite3_create_function(db, aAgg[i].zName, aAgg[i].nArg,
SQLITE_UTF8 | SQLITE_DETERMINISTIC, 0,
0, aAgg[i].xStep, aAgg[i].xFinal);
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
for(i=0; i<sizeof(aMod)/sizeof(aMod[0]) && rc==SQLITE_OK; i++){
rc = sqlite3_create_module(db, aMod[i].zName, aMod[i].pModule, 0);
}
#endif
return rc;
|
| | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | | > > > > > > > > > > > | > | > | | > |
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}else{
jsonAppendChar(pStr, ',');
pStr->pCtx = ctx;
}
jsonAppendValue(pStr, argv[0]);
}
}
static void jsonArrayCompute(sqlite3_context *ctx, int isFinal){
JsonString *pStr;
pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
if( pStr ){
pStr->pCtx = ctx;
jsonAppendChar(pStr, ']');
if( pStr->bErr ){
if( pStr->bErr==1 ) sqlite3_result_error_nomem(ctx);
assert( pStr->bStatic );
}else if( isFinal ){
sqlite3_result_text(ctx, pStr->zBuf, pStr->nUsed,
pStr->bStatic ? SQLITE_TRANSIENT : sqlite3_free);
pStr->bStatic = 1;
}else{
sqlite3_result_text(ctx, pStr->zBuf, pStr->nUsed, SQLITE_TRANSIENT);
pStr->nUsed--;
}
}else{
sqlite3_result_text(ctx, "[]", 2, SQLITE_STATIC);
}
sqlite3_result_subtype(ctx, JSON_SUBTYPE);
}
static void jsonArrayValue(sqlite3_context *ctx){
jsonArrayCompute(ctx, 0);
}
static void jsonArrayFinal(sqlite3_context *ctx){
jsonArrayCompute(ctx, 1);
}
#ifndef SQLITE_OMIT_WINDOWFUNC
/*
** This method works for both json_group_array() and json_group_object().
** It works by removing the first element of the group by searching forward
** to the first comma (",") that is not within a string and deleting all
** text through that comma.
*/
static void jsonGroupInverse(
sqlite3_context *ctx,
int argc,
sqlite3_value **argv
){
int i;
int inStr = 0;
char *z;
JsonString *pStr;
pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
if( !pStr ) return;
z = pStr->zBuf;
for(i=1; z[i]!=',' || inStr; i++){
assert( i<pStr->nUsed );
if( z[i]=='"' ){
inStr = !inStr;
}else if( z[i]=='\\' ){
i++;
}
}
pStr->nUsed -= i;
memmove(&z[1], &z[i+1], pStr->nUsed-1);
}
#else
# define jsonGroupInverse 0
#endif
/*
** json_group_obj(NAME,VALUE)
**
** Return a JSON object composed of all names and values in the aggregate.
*/
static void jsonObjectStep(
................................................................................
z = (const char*)sqlite3_value_text(argv[0]);
n = (u32)sqlite3_value_bytes(argv[0]);
jsonAppendString(pStr, z, n);
jsonAppendChar(pStr, ':');
jsonAppendValue(pStr, argv[1]);
}
}
static void jsonObjectCompute(sqlite3_context *ctx, int isFinal){
JsonString *pStr;
pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
if( pStr ){
jsonAppendChar(pStr, '}');
if( pStr->bErr ){
if( pStr->bErr==1 ) sqlite3_result_error_nomem(ctx);
assert( pStr->bStatic );
}else if( isFinal ){
sqlite3_result_text(ctx, pStr->zBuf, pStr->nUsed,
pStr->bStatic ? SQLITE_TRANSIENT : sqlite3_free);
pStr->bStatic = 1;
}else{
sqlite3_result_text(ctx, pStr->zBuf, pStr->nUsed, SQLITE_TRANSIENT);
pStr->nUsed--;
}
}else{
sqlite3_result_text(ctx, "{}", 2, SQLITE_STATIC);
}
sqlite3_result_subtype(ctx, JSON_SUBTYPE);
}
static void jsonObjectValue(sqlite3_context *ctx){
jsonObjectCompute(ctx, 0);
}
static void jsonObjectFinal(sqlite3_context *ctx){
jsonObjectCompute(ctx, 1);
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
/****************************************************************************
** The json_each virtual table
****************************************************************************/
typedef struct JsonEachCursor JsonEachCursor;
................................................................................
#endif
};
static const struct {
const char *zName;
int nArg;
void (*xStep)(sqlite3_context*,int,sqlite3_value**);
void (*xFinal)(sqlite3_context*);
void (*xValue)(sqlite3_context*);
} aAgg[] = {
{ "json_group_array", 1,
jsonArrayStep, jsonArrayFinal, jsonArrayValue },
{ "json_group_object", 2,
jsonObjectStep, jsonObjectFinal, jsonObjectValue },
};
#ifndef SQLITE_OMIT_VIRTUALTABLE
static const struct {
const char *zName;
sqlite3_module *pModule;
} aMod[] = {
{ "json_each", &jsonEachModule },
................................................................................
for(i=0; i<sizeof(aFunc)/sizeof(aFunc[0]) && rc==SQLITE_OK; i++){
rc = sqlite3_create_function(db, aFunc[i].zName, aFunc[i].nArg,
SQLITE_UTF8 | SQLITE_DETERMINISTIC,
(void*)&aFunc[i].flag,
aFunc[i].xFunc, 0, 0);
}
for(i=0; i<sizeof(aAgg)/sizeof(aAgg[0]) && rc==SQLITE_OK; i++){
rc = sqlite3_create_window_function(db, aAgg[i].zName, aAgg[i].nArg,
SQLITE_UTF8 | SQLITE_DETERMINISTIC, 0,
aAgg[i].xStep, aAgg[i].xFinal,
aAgg[i].xValue, jsonGroupInverse, 0);
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
for(i=0; i<sizeof(aMod)/sizeof(aMod[0]) && rc==SQLITE_OK; i++){
rc = sqlite3_create_module(db, aMod[i].zName, aMod[i].pModule, 0);
}
#endif
return rc;
|
Changes to src/vdbe.c.
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** for an aggregate and store the result in P1. Or, if P3 is non-zero,
** invoke the xValue() function and store the result in register P3.
**
** P2 is the number of arguments that the step function takes and
** P4 is a pointer to the FuncDef for this function. The P2
** argument is not used by this opcode. It is only there to disambiguate
** functions that can take varying numbers of arguments. The
** P4 argument is only needed for the degenerate case where
** the step function was not previously called.
*/
case OP_AggFinal: {
Mem *pMem;
assert( pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor) );
pMem = &aMem[pOp->p1];
assert( (pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
|
| |
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** for an aggregate and store the result in P1. Or, if P3 is non-zero,
** invoke the xValue() function and store the result in register P3.
**
** P2 is the number of arguments that the step function takes and
** P4 is a pointer to the FuncDef for this function. The P2
** argument is not used by this opcode. It is only there to disambiguate
** functions that can take varying numbers of arguments. The
** P4 argument is only needed for the case where
** the step function was not previously called.
*/
case OP_AggFinal: {
Mem *pMem;
assert( pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor) );
pMem = &aMem[pOp->p1];
assert( (pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
|
Changes to test/json103.test.
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CREATE TABLE t1(x);
INSERT INTO t1 VALUES(1),('abc');
SELECT
json_group_array(x),
json_group_array(json_object('x',x))
FROM t1;
} {{[1,"abc"]} {[{"x":1},{"x":"abc"}]}}
finish_test
|
> > > > > > > > > > > > > > > > > > > > |
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CREATE TABLE t1(x);
INSERT INTO t1 VALUES(1),('abc');
SELECT
json_group_array(x),
json_group_array(json_object('x',x))
FROM t1;
} {{[1,"abc"]} {[{"x":1},{"x":"abc"}]}}
# json_group_array() and json_group_object() work as window functions.
#
ifcapable windowfunc {
do_execsql_test json103-400 {
CREATE TABLE t4(x);
INSERT INTO t4 VALUES
(1),
('a,b'),
(3),
('x"y'),
(5),
(6),
(7);
SELECT json_group_array(x) OVER (ROWS 2 PRECEDING) FROM t4;
} {{[1]} {[1,"a,b"]} {[1,"a,b",3]} {["a,b",3,"x\"y"]} {[3,"x\"y",5]} {["x\"y",5,6]} {[5,6,7]}}
do_execsql_test json103-410 {
SELECT json_group_object(rowid, x) OVER (ROWS 2 PRECEDING) FROM t4;
} {{{"1":1}} {{"1":1,"2":"a,b"}} {{"1":1,"2":"a,b","3":3}} {{"2":"a,b","3":3,"4":"x\"y"}} {{"3":3,"4":"x\"y","5":5}} {{"4":"x\"y","5":5,"6":6}} {{"5":5,"6":6,"7":7}}}
}
finish_test
|