mirror of https://github.com/sqlite/sqlite
Add the percentile() SQL function as a loadable
extension in the ext/misc directory. FossilOrigin-Name: a64d760d9290b1be78cdda7ae66d4f02c3b3fa53
This commit is contained in:
drh
parent
cda73feaa2
commit
def3367e50
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@ -393,6 +393,7 @@ TESTSRC += \
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$(TOP)/ext/misc/fuzzer.c \
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$(TOP)/ext/misc/ieee754.c \
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$(TOP)/ext/misc/nextchar.c \
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$(TOP)/ext/misc/percentile.c \
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$(TOP)/ext/misc/regexp.c \
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$(TOP)/ext/misc/spellfix.c \
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$(TOP)/ext/misc/wholenumber.c
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@ -713,6 +713,7 @@ TESTEXT = \
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$(TOP)\ext\misc\fuzzer.c \
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$(TOP)\ext\misc\ieee754.c \
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$(TOP)\ext\misc\nextchar.c \
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$(TOP)\ext\misc\percentile.c \
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$(TOP)\ext\misc\regexp.c \
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$(TOP)\ext\misc\spellfix.c \
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$(TOP)\ext\misc\wholenumber.c
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@ -0,0 +1,219 @@
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/*
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** 2013-05-28
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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******************************************************************************
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**
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** This file contains code to implement the percentile(Y,P) SQL function
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** as described below:
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**
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** (1) The percentile(Y,P) function is an aggregate function taking
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** exactly two arguments.
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**
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** (2) If the P argument to percentile(Y,P) is not the same for every
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** row in the aggregate then an error is thrown. The word "same"
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** in the previous sentence means that the value differ by less
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** than 0.001.
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**
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** (3) If the P argument to percentile(Y,P) evaluates to anything other
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** than a number in the range of 0.0 to 100.0 inclusive then an
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** error is thrown.
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**
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** (4) If any Y argument to percentile(Y,P) evaluates to a value that
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** is not NULL and is not numeric then an error is thrown.
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**
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** (5) If any Y argument to percentile(Y,P) evaluates to plus or minus
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** infinity then an error is thrown. (SQLite always interprets NaN
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** values as NULL.)
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**
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** (6) Both Y and P in percentile(Y,P) can be arbitrary expressions,
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** including CASE WHEN expressions.
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**
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** (7) The percentile(Y,P) aggregate is able to handle inputs of at least
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** one million (1,000,000) rows.
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**
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** (8) If there are no non-NULL values for Y, then percentile(Y,P)
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** returns NULL.
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**
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** (9) If there is exactly one non-NULL value for Y, the percentile(Y,P)
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** returns the one Y value.
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**
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** (10) If there N non-NULL values of Y where N is two or more and
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** the Y values are ordered from least to greatest and a graph is
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** drawn from 0 to N-1 such that the height of the graph at J is
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** the J-th Y value and such that straight lines are drawn between
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** adjacent Y values, then the percentile(Y,P) function returns
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** the height of the graph at P*(N-1)/100.
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**
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** (11) The percentile(Y,P) function always returns either a floating
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** point number or NULL.
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**
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** (12) The percentile(Y,P) is implemented as a single C99 source-code
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** file that compiles into a shared-library or DLL that can be loaded
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** into SQLite using the sqlite3_load_extension() interface.
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*/
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#include "sqlite3ext.h"
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SQLITE_EXTENSION_INIT1
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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/* The following object is the session context for a single percentile()
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** function. We have to remember all input Y values until the very end.
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** Those values are accumulated in the Percentile.a[] array.
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*/
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typedef struct Percentile Percentile;
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struct Percentile {
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unsigned nAlloc; /* Number of slots allocated for a[] */
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unsigned nUsed; /* Number of slots actually used in a[] */
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double rPct; /* 1.0 more than the value for P */
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double *a; /* Array of Y values */
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};
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/*
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** Return TRUE if the input floating-point number is an infinity.
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*/
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static int isInfinity(double r){
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sqlite3_uint64 u;
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assert( sizeof(u)==sizeof(r) );
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memcpy(&u, &r, sizeof(u));
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return ((u>>52)&0x7ff)==0x7ff;
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}
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/*
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** Return TRUE if two doubles differ by 0.001 or less
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*/
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static int sameValue(double a, double b){
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a -= b;
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return a>=-0.001 && a<=0.001;
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}
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/*
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** The "step" function for percentile(Y,P) is called once for each
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** input row.
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*/
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static void percentStep(sqlite3_context *pCtx, int argc, sqlite3_value **argv){
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Percentile *p;
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double rPct;
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int eType;
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double y;
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assert( argc==2 );
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/* Requirement 3: P must be a number between 0 and 100 */
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eType = sqlite3_value_numeric_type(argv[1]);
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rPct = sqlite3_value_double(argv[1]);
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if( (eType!=SQLITE_INTEGER && eType!=SQLITE_FLOAT) ||
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((rPct = sqlite3_value_double(argv[1]))<0.0 || rPct>100.0) ){
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sqlite3_result_error(pCtx, "2nd argument to percentile() is not "
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"a number between 0.0 and 100.0", -1);
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return;
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}
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/* Allocate the session context. */
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p = (Percentile*)sqlite3_aggregate_context(pCtx, sizeof(*p));
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if( p==0 ) return;
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/* Remember the P value. Throw an error if the P value is different
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** from any prior row, per Requirement (2). */
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if( p->rPct==0.0 ){
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p->rPct = rPct+1.0;
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}else if( !sameValue(p->rPct,rPct+1.0) ){
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sqlite3_result_error(pCtx, "2nd argument to percentile() is not the "
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"same for all input rows", -1);
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return;
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}
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/* Ignore rows for which Y is NULL */
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eType = sqlite3_value_type(argv[0]);
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if( eType==SQLITE_NULL ) return;
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/* If not NULL, then Y must be numeric. Otherwise throw an error.
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** Requirement 4 */
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if( eType!=SQLITE_INTEGER && eType!=SQLITE_FLOAT ){
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sqlite3_result_error(pCtx, "1st argument to percentile() is not "
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"numeric", -1);
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return;
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}
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/* Throw an error if the Y value is infinity or NaN */
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y = sqlite3_value_double(argv[0]);
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if( isInfinity(y) ){
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sqlite3_result_error(pCtx, "Inf input to percentile()", -1);
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return;
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}
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/* Allocate and store the Y */
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if( p->nUsed>=p->nAlloc ){
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unsigned n = p->nAlloc*2 + 250;
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double *a = sqlite3_realloc(p->a, sizeof(double)*n);
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if( a==0 ){
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sqlite3_free(p->a);
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memset(p, 0, sizeof(*p));
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sqlite3_result_error_nomem(pCtx);
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return;
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}
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p->nAlloc = n;
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p->a = a;
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}
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p->a[p->nUsed++] = y;
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}
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/*
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** Compare to doubles for sorting using qsort()
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*/
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static int doubleCmp(const void *pA, const void *pB){
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double a = *(double*)pA;
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double b = *(double*)pB;
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if( a==b ) return 0;
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if( a<b ) return -1;
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return +1;
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}
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/*
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** Called to compute the final output of percentile() and to clean
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** up all allocated memory.
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*/
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static void percentFinal(sqlite3_context *pCtx){
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Percentile *p;
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unsigned i1, i2;
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double v1, v2;
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double ix, vx;
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p = (Percentile*)sqlite3_aggregate_context(pCtx, 0);
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if( p==0 ) return;
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if( p->a==0 ) return;
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if( p->nUsed ){
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qsort(p->a, p->nUsed, sizeof(double), doubleCmp);
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ix = (p->rPct-1.0)*(p->nUsed-1)*0.01;
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i1 = ix;
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i2 = ix==(double)i1 || i1==p->nUsed-1 ? i1 : i1+1;
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v1 = p->a[i1];
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v2 = p->a[i2];
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vx = v1 + (v2-v1)*(ix-i1);
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sqlite3_result_double(pCtx, vx);
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}
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sqlite3_free(p->a);
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memset(p, 0, sizeof(*p));
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}
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#ifdef _WIN32
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__declspec(dllexport)
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#endif
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int sqlite3_percentile_init(
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sqlite3 *db,
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char **pzErrMsg,
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const sqlite3_api_routines *pApi
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){
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int rc = SQLITE_OK;
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SQLITE_EXTENSION_INIT2(pApi);
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(void)pzErrMsg; /* Unused parameter */
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rc = sqlite3_create_function(db, "percentile", 2, SQLITE_UTF8, 0,
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0, percentStep, percentFinal);
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return rc;
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}
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1
main.mk
1
main.mk
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@ -275,6 +275,7 @@ TESTSRC += \
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$(TOP)/ext/misc/fuzzer.c \
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$(TOP)/ext/misc/ieee754.c \
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$(TOP)/ext/misc/nextchar.c \
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$(TOP)/ext/misc/percentile.c \
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$(TOP)/ext/misc/regexp.c \
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$(TOP)/ext/misc/spellfix.c \
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$(TOP)/ext/misc/wholenumber.c
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20
manifest
20
manifest
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@ -1,9 +1,9 @@
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C Finish\sremoving\sthe\ssqlite3.inTrans\sfield.\s\sIn\sthe\sprevious\scheck-in,\sit\swas\nmerely\scommented\sout\sbecause\sI\sfailed\sto\sselect\sFile->Save\son\smy\stext\seditor.
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D 2013-05-28T17:30:52.422
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C Add\sthe\spercentile()\sSQL\sfunction\sas\sa\sloadable\s\nextension\sin\sthe\sext/misc\sdirectory.
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D 2013-05-28T20:25:54.766
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F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
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F Makefile.in f6b58b7bdf6535f0f0620c486dd59aa4662c0b4f
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F Makefile.in 5e41da95d92656a5004b03d3576e8b226858a28e
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F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
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F Makefile.msc 5dc042f51187414d5886ac6d8308630d484690c4
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F Makefile.msc 7d226394826f060f232c0a02a468e8651819b7c2
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F Makefile.vxworks db21ed42a01d5740e656b16f92cb5d8d5e5dd315
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F README cd04a36fbc7ea56932a4052d7d0b7f09f27c33d6
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F VERSION 05c7bd63b96f31cfdef5c766ed91307ac121f5aa
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@ -111,6 +111,7 @@ F ext/misc/closure.c 40788c54c59190a1f52f6492a260d8894a246fe9
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F ext/misc/fuzzer.c 51bd96960b6b077d41d6f3cedefbcb57f29efaa2
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F ext/misc/ieee754.c 2565ce373d842977efe0922dc50b8a41b3289556
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F ext/misc/nextchar.c 1131e2b36116ffc6fe6b2e3464bfdace27978b1e
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F ext/misc/percentile.c 4fb5e46c4312b0be74e8e497ac18f805f0e3e6c5
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F ext/misc/regexp.c c25c65fe775f5d9801fb8573e36ebe73f2c0c2e0
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F ext/misc/rot13.c 1ac6f95f99b575907b9b09c81a349114cf9be45a
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F ext/misc/spellfix.c 6d7ce6105a4b7729f6c44ccdf1ab7e80d9707c02
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@ -137,7 +138,7 @@ F ext/rtree/viewrtree.tcl eea6224b3553599ae665b239bd827e182b466024
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F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 x
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F ltmain.sh 3ff0879076df340d2e23ae905484d8c15d5fdea8
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F magic.txt f2b23a6bde8f1c6e86b957e4d94eab0add520b0d
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F main.mk 2a3cd58acfd1ecc656027afdd60ed1eefb07380f
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F main.mk e536751ac719806209c51f5dc63022a5dd40c631
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F mkdll.sh 7d09b23c05d56532e9d44a50868eb4b12ff4f74a
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F mkextu.sh 416f9b7089d80e5590a29692c9d9280a10dbad9f
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F mkextw.sh 4123480947681d9b434a5e7b1ee08135abe409ac
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@ -224,7 +225,7 @@ F src/sqliteLimit.h 164b0e6749d31e0daa1a4589a169d31c0dec7b3d
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F src/status.c bedc37ec1a6bb9399944024d63f4c769971955a9
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F src/table.c 2cd62736f845d82200acfa1287e33feb3c15d62e
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F src/tclsqlite.c 2ecec9937e69bc17560ad886da35195daa7261b8
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F src/test1.c 43c87e52cb504e8c9928b1e9bad21a6117c695e9
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F src/test1.c 6d2a340eea1d866bf7059894491652a69a7ee802
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F src/test2.c 7355101c085304b90024f2261e056cdff13c6c35
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F src/test3.c 1c0e5d6f080b8e33c1ce8b3078e7013fdbcd560c
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F src/test4.c 9b32d22f5f150abe23c1830e2057c4037c45b3df
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@ -703,6 +704,7 @@ F test/pageropt.test 6b8f6a123a5572c195ad4ae40f2987007923bbd6
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F test/pagesize.test 1dd51367e752e742f58e861e65ed7390603827a0
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F test/pcache.test 065aa286e722ab24f2e51792c1f093bf60656b16
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F test/pcache2.test a83efe2dec0d392f814bfc998def1d1833942025
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F test/percentile.test 4614301e38398df7fdd5f28f4ed8f272b328251b
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F test/permutations.test d997a947ab8aabb15f763d50a030b3c11e8ef1b6
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F test/pragma.test 5e7de6c32a5d764f09437d2025f07e4917b9e178
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F test/pragma2.test 3a55f82b954242c642f8342b17dffc8b47472947
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@ -1090,7 +1092,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
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F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
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F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
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F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
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P c3381cd4957013d46075996c3b865177c888d2a8
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R b4b6c4d83a50772ea0d179f36ddb400e
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P 2f97e38a6611cb17c24d74332d3ac3777dc0dd3e
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R 339888db3396051923023dfe123ab06e
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U drh
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Z a65b38b6ed5056fa8821564d4893ee8d
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Z 1117fca47d6619d98ed20043a3bd4774
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@ -1 +1 @@
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2f97e38a6611cb17c24d74332d3ac3777dc0dd3e
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a64d760d9290b1be78cdda7ae66d4f02c3b3fa53
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@ -6012,6 +6012,7 @@ static int tclLoadStaticExtensionCmd(
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extern int sqlite3_fuzzer_init(sqlite3*,char**,const sqlite3_api_routines*);
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extern int sqlite3_ieee_init(sqlite3*,char**,const sqlite3_api_routines*);
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extern int sqlite3_nextchar_init(sqlite3*,char**,const sqlite3_api_routines*);
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extern int sqlite3_percentile_init(sqlite3*,char**,const sqlite3_api_routines*);
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extern int sqlite3_regexp_init(sqlite3*,char**,const sqlite3_api_routines*);
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extern int sqlite3_spellfix_init(sqlite3*,char**,const sqlite3_api_routines*);
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extern int sqlite3_wholenumber_init(sqlite3*,char**,const sqlite3_api_routines*);
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@ -6024,6 +6025,7 @@ static int tclLoadStaticExtensionCmd(
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{ "fuzzer", sqlite3_fuzzer_init },
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{ "ieee754", sqlite3_ieee_init },
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{ "nextchar", sqlite3_nextchar_init },
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{ "percentile", sqlite3_percentile_init },
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{ "regexp", sqlite3_regexp_init },
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{ "spellfix", sqlite3_spellfix_init },
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{ "wholenumber", sqlite3_wholenumber_init },
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@ -0,0 +1,207 @@
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# 2013-05-28
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#
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# The author disclaims copyright to this source code. In place of
|
||||
# a legal notice, here is a blessing:
|
||||
#
|
||||
# May you do good and not evil.
|
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# May you find forgiveness for yourself and forgive others.
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||||
# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library. The
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# focus of this file is percentile.c extension
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# Basic test of the percentile() function.
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#
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do_test percentile-1.0 {
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load_static_extension db percentile
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execsql {
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CREATE TABLE t1(x);
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INSERT INTO t1 VALUES(1),(4),(6),(7),(8),(9),(11),(11),(11);
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}
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execsql {SELECT percentile(x,0) FROM t1}
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} {1.0}
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foreach {in out} {
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100 11.0
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50 8.0
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12.5 4.0
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15 4.4
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20 5.2
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80 11.0
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||||
89 11.0
|
||||
} {
|
||||
do_test percentile-1.1.$in {
|
||||
execsql {SELECT percentile(x,$in) FROM t1}
|
||||
} $out
|
||||
}
|
||||
|
||||
# Add some NULL values.
|
||||
#
|
||||
do_test percentile-1.2 {
|
||||
execsql {INSERT INTO t1 VALUES(NULL),(NULL);}
|
||||
} {}
|
||||
foreach {in out} {
|
||||
100 11.0
|
||||
50 8.0
|
||||
12.5 4.0
|
||||
15 4.4
|
||||
20 5.2
|
||||
80 11.0
|
||||
89 11.0
|
||||
} {
|
||||
do_test percentile-1.3.$in {
|
||||
execsql {SELECT percentile(x,$in) FROM t1}
|
||||
} $out
|
||||
}
|
||||
|
||||
# The second argument to percentile can change some, but not much.
|
||||
#
|
||||
do_test percentile-1.4 {
|
||||
catchsql {SELECT round(percentile(x, 15+0.000001*rowid),1) FROM t1}
|
||||
} {0 4.4}
|
||||
do_test percentile-1.5 {
|
||||
catchsql {SELECT round(percentile(x, 15+0.1*rowid),1) FROM t1}
|
||||
} {1 {2nd argument to percentile() is not the same for all input rows}}
|
||||
|
||||
# Input values in a random order
|
||||
#
|
||||
do_test percentile-1.6 {
|
||||
execsql {
|
||||
CREATE TABLE t2(x);
|
||||
INSERT INTO t2 SELECT x+0.0 FROM t1 ORDER BY random();
|
||||
}
|
||||
} {}
|
||||
foreach {in out} {
|
||||
100 11.0
|
||||
50 8.0
|
||||
12.5 4.0
|
||||
15 4.4
|
||||
20 5.2
|
||||
80 11.0
|
||||
89 11.0
|
||||
} {
|
||||
do_test percentile-1.7.$in {
|
||||
execsql {SELECT percentile(x,$in) FROM t2}
|
||||
} $out
|
||||
}
|
||||
|
||||
# Wrong number of arguments
|
||||
#
|
||||
do_test percentile-1.8 {
|
||||
catchsql {SELECT percentile(x,0,1) FROM t1}
|
||||
} {1 {wrong number of arguments to function percentile()}}
|
||||
do_test percentile-1.9 {
|
||||
catchsql {SELECT percentile(x) FROM t1}
|
||||
} {1 {wrong number of arguments to function percentile()}}
|
||||
|
||||
# Second argument must be numeric
|
||||
#
|
||||
do_test percentile-1.10 {
|
||||
catchsql {SELECT percentile(x,null) FROM t1}
|
||||
} {1 {2nd argument to percentile() is not a number between 0.0 and 100.0}}
|
||||
do_test percentile-1.11 {
|
||||
catchsql {SELECT percentile(x,'fifty') FROM t1}
|
||||
} {1 {2nd argument to percentile() is not a number between 0.0 and 100.0}}
|
||||
do_test percentile-1.12 {
|
||||
catchsql {SELECT percentile(x,x'3530') FROM t1}
|
||||
} {1 {2nd argument to percentile() is not a number between 0.0 and 100.0}}
|
||||
|
||||
# Second argument is out of range
|
||||
#
|
||||
do_test percentile-1.13 {
|
||||
catchsql {SELECT percentile(x,-0.0000001) FROM t1}
|
||||
} {1 {2nd argument to percentile() is not a number between 0.0 and 100.0}}
|
||||
do_test percentile-1.14 {
|
||||
catchsql {SELECT percentile(x,100.0000001) FROM t1}
|
||||
} {1 {2nd argument to percentile() is not a number between 0.0 and 100.0}}
|
||||
|
||||
# First argument is not NULL and is not NUMERIC
|
||||
#
|
||||
do_test percentile-1.15 {
|
||||
catchsql {
|
||||
BEGIN;
|
||||
UPDATE t1 SET x='50' WHERE x IS NULL;
|
||||
SELECT percentile(x, 50) FROM t1;
|
||||
}
|
||||
} {1 {1st argument to percentile() is not numeric}}
|
||||
do_test percentile-1.16 {
|
||||
catchsql {
|
||||
ROLLBACK;
|
||||
BEGIN;
|
||||
UPDATE t1 SET x=x'3530' WHERE x IS NULL;
|
||||
SELECT percentile(x, 50) FROM t1;
|
||||
}
|
||||
} {1 {1st argument to percentile() is not numeric}}
|
||||
do_test percentile-1.17 {
|
||||
catchsql {
|
||||
ROLLBACK;
|
||||
SELECT percentile(x, 50) FROM t1;
|
||||
}
|
||||
} {0 8.0}
|
||||
|
||||
# No non-NULL entries.
|
||||
#
|
||||
do_test percentile-1.18 {
|
||||
execsql {
|
||||
UPDATE t1 SET x=NULL;
|
||||
SELECT ifnull(percentile(x, 50),'NULL') FROM t1
|
||||
}
|
||||
} {NULL}
|
||||
|
||||
# Exactly one non-NULL entry
|
||||
#
|
||||
do_test percentile-1.19 {
|
||||
execsql {
|
||||
UPDATE t1 SET x=12345 WHERE rowid=5;
|
||||
SELECT percentile(x, 0), percentile(x, 50), percentile(x,100) FROM t1
|
||||
}
|
||||
} {12345.0 12345.0 12345.0}
|
||||
|
||||
# Infinity as an input
|
||||
#
|
||||
do_test percentile-1.20 {
|
||||
catchsql {
|
||||
DELETE FROM t1;
|
||||
INSERT INTO t1 SELECT x+0.0 FROM t2;
|
||||
UPDATE t1 SET x=1.0e300*1.0e300 WHERE rowid=5;
|
||||
SELECT percentile(x,50) from t1;
|
||||
}
|
||||
} {1 {Inf input to percentile()}}
|
||||
do_test percentile-1.21 {
|
||||
catchsql {
|
||||
UPDATE t1 SET x=-1.0e300*1.0e300 WHERE rowid=5;
|
||||
SELECT percentile(x,50) from t1;
|
||||
}
|
||||
} {1 {Inf input to percentile()}}
|
||||
|
||||
# Million-row Inputs
|
||||
#
|
||||
do_test percentile-2.0 {
|
||||
load_static_extension db wholenumber
|
||||
execsql {
|
||||
CREATE VIRTUAL TABLE nums USING wholenumber;
|
||||
CREATE TABLE t3(x);
|
||||
INSERT INTO t3 SELECT value-1 FROM nums WHERE value BETWEEN 1 AND 500000;
|
||||
INSERT INTO t3 SELECT value*10 FROM nums
|
||||
WHERE value BETWEEN 500000 AND 999999;
|
||||
SELECT count(*) FROM t3;
|
||||
}
|
||||
} {1000000}
|
||||
foreach {in out} {
|
||||
0 0.0
|
||||
100 9999990.0
|
||||
50 2749999.5
|
||||
10 99999.9
|
||||
} {
|
||||
do_test percentile-2.1.$in {
|
||||
execsql {
|
||||
SELECT percentile(x, $in) from t3;
|
||||
}
|
||||
} $out
|
||||
}
|
||||
|
||||
finish_test
|
||||
Loading…
Reference in New Issue