/
trimmed_aggregates.c
2829 lines (2088 loc) · 67.8 KB
/
trimmed_aggregates.c
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/*
* trimmed.c - Trimmed aggregate functions
* Copyright (C) Tomas Vondra, 2011-2016
*
*
* Implementation of trimmed avg/stddev/var aggregates.
*
* The memory consumption might be a problem, as all the values are kept in
* memory - for example 1.000.000 of 8-byte values (bigint) requires about
* 8MB of memory.
*/
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include "postgres.h"
#include "utils/datum.h"
#include "utils/palloc.h"
#include "utils/array.h"
#include "utils/lsyscache.h"
#include "utils/numeric.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#include "nodes/memnodes.h"
#include "fmgr.h"
#include "catalog/pg_type.h"
#include "funcapi.h"
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif
#define GET_AGG_CONTEXT(fname, fcinfo, aggcontext) \
if (! AggCheckCallContext(fcinfo, &aggcontext)) { \
elog(ERROR, "%s called in non-aggregate context", fname); \
}
#define CHECK_AGG_CONTEXT(fname, fcinfo) \
if (! AggCheckCallContext(fcinfo, NULL)) { \
elog(ERROR, "%s called in non-aggregate context", fname); \
}
/* how many elements to start with */
#define MIN_ELEMENTS 32
/* FIXME The final functions copy a lot of code - refactor to share. */
/* Structures used to keep the data - the 'elements' array is extended
* on the fly if needed. */
typedef struct state_double
{
int maxelements; /* size of elements array */
int nelements; /* number of used items */
double cut_lower; /* fraction to cut at the lower end */
double cut_upper; /* fraction to cut at the upper end */
bool sorted; /* are the elements sorted */
double *elements; /* array of values */
} state_double;
typedef struct state_int32
{
int maxelements; /* size of elements array */
int nelements; /* number of used items */
double cut_lower; /* fraction to cut at the lower end */
double cut_upper; /* fraction to cut at the upper end */
bool sorted; /* are the elements sorted */
int32 *elements; /* array of values */
} state_int32;
typedef struct state_int64
{
int maxelements; /* size of elements array */
int nelements; /* number of used items */
double cut_lower; /* fraction to cut at the lower end */
double cut_upper; /* fraction to cut at the upper end */
bool sorted; /* are the elements sorted */
int64 *elements; /* array of values */
} state_int64;
typedef struct state_numeric
{
int nelements; /* number of stored items */
double cut_lower; /* fraction to cut at the lower end */
double cut_upper; /* fraction to cut at the upper end */
bool sorted; /* are the elements sorted */
int maxlen; /* total size of the buffer */
int usedlen; /* used part of the buffer */
char *data; /* contents of the numeric values */
} state_numeric;
/* comparators, used for qsort */
static int double_comparator(const void *a, const void *b);
static int int32_comparator(const void *a, const void *b);
static int int64_comparator(const void *a, const void *b);
static int numeric_comparator(const void *a, const void *b);
static void sort_state_double(state_double *state);
static void sort_state_int32(state_int32 *state);
static void sort_state_int64(state_int64 *state);
static void sort_state_numeric(state_numeric *state);
static Datum
double_to_array(FunctionCallInfo fcinfo, double * d, int len);
static Datum
numeric_to_array(FunctionCallInfo fcinfo, Numeric * d, int len);
/* ACCUMULATE DATA */
PG_FUNCTION_INFO_V1(trimmed_append_double);
PG_FUNCTION_INFO_V1(trimmed_append_int32);
PG_FUNCTION_INFO_V1(trimmed_append_int64);
PG_FUNCTION_INFO_V1(trimmed_append_numeric);
Datum trimmed_append_double(PG_FUNCTION_ARGS);
Datum trimmed_append_int32(PG_FUNCTION_ARGS);
Datum trimmed_append_int64(PG_FUNCTION_ARGS);
Datum trimmed_append_numeric(PG_FUNCTION_ARGS);
/* SERIALIZE STATE */
PG_FUNCTION_INFO_V1(trimmed_serial_double);
PG_FUNCTION_INFO_V1(trimmed_serial_int32);
PG_FUNCTION_INFO_V1(trimmed_serial_int64);
PG_FUNCTION_INFO_V1(trimmed_serial_numeric);
Datum trimmed_serial_double(PG_FUNCTION_ARGS);
Datum trimmed_serial_int32(PG_FUNCTION_ARGS);
Datum trimmed_serial_int64(PG_FUNCTION_ARGS);
Datum trimmed_serial_numeric(PG_FUNCTION_ARGS);
/* DESERIALIZE STATE */
PG_FUNCTION_INFO_V1(trimmed_deserial_double);
PG_FUNCTION_INFO_V1(trimmed_deserial_int32);
PG_FUNCTION_INFO_V1(trimmed_deserial_int64);
PG_FUNCTION_INFO_V1(trimmed_deserial_numeric);
Datum trimmed_deserial_double(PG_FUNCTION_ARGS);
Datum trimmed_deserial_int32(PG_FUNCTION_ARGS);
Datum trimmed_deserial_int64(PG_FUNCTION_ARGS);
Datum trimmed_deserial_numeric(PG_FUNCTION_ARGS);
/* COMBINE STATE */
PG_FUNCTION_INFO_V1(trimmed_combine_double);
PG_FUNCTION_INFO_V1(trimmed_combine_int32);
PG_FUNCTION_INFO_V1(trimmed_combine_int64);
PG_FUNCTION_INFO_V1(trimmed_combine_numeric);
Datum trimmed_combine_double(PG_FUNCTION_ARGS);
Datum trimmed_combine_int32(PG_FUNCTION_ARGS);
Datum trimmed_combine_int64(PG_FUNCTION_ARGS);
Datum trimmed_combine_numeric(PG_FUNCTION_ARGS);
/* AVERAGE */
PG_FUNCTION_INFO_V1(trimmed_avg_double);
PG_FUNCTION_INFO_V1(trimmed_avg_int32);
PG_FUNCTION_INFO_V1(trimmed_avg_int64);
PG_FUNCTION_INFO_V1(trimmed_avg_numeric);
Datum trimmed_avg_double(PG_FUNCTION_ARGS);
Datum trimmed_avg_int32(PG_FUNCTION_ARGS);
Datum trimmed_avg_int64(PG_FUNCTION_ARGS);
Datum trimmed_avg_numeric(PG_FUNCTION_ARGS);
/* VARIANCE */
/* exact */
PG_FUNCTION_INFO_V1(trimmed_var_double);
PG_FUNCTION_INFO_V1(trimmed_var_int32);
PG_FUNCTION_INFO_V1(trimmed_var_int64);
PG_FUNCTION_INFO_V1(trimmed_var_numeric);
Datum trimmed_var_double(PG_FUNCTION_ARGS);
Datum trimmed_var_int32(PG_FUNCTION_ARGS);
Datum trimmed_var_int64(PG_FUNCTION_ARGS);
Datum trimmed_var_numeric(PG_FUNCTION_ARGS);
/* population estimate */
PG_FUNCTION_INFO_V1(trimmed_var_pop_double);
PG_FUNCTION_INFO_V1(trimmed_var_pop_int32);
PG_FUNCTION_INFO_V1(trimmed_var_pop_int64);
PG_FUNCTION_INFO_V1(trimmed_var_pop_numeric);
Datum trimmed_var_pop_double(PG_FUNCTION_ARGS);
Datum trimmed_var_pop_int32(PG_FUNCTION_ARGS);
Datum trimmed_var_pop_int64(PG_FUNCTION_ARGS);
Datum trimmed_var_pop_numeric(PG_FUNCTION_ARGS);
/* sample estimate */
PG_FUNCTION_INFO_V1(trimmed_var_samp_double);
PG_FUNCTION_INFO_V1(trimmed_var_samp_int32);
PG_FUNCTION_INFO_V1(trimmed_var_samp_int64);
PG_FUNCTION_INFO_V1(trimmed_var_samp_numeric);
Datum trimmed_var_samp_double(PG_FUNCTION_ARGS);
Datum trimmed_var_samp_int32(PG_FUNCTION_ARGS);
Datum trimmed_var_samp_int64(PG_FUNCTION_ARGS);
Datum trimmed_var_samp_numeric(PG_FUNCTION_ARGS);
/* STANDARD DEVIATION */
/* exact */
PG_FUNCTION_INFO_V1(trimmed_stddev_double);
PG_FUNCTION_INFO_V1(trimmed_stddev_int32);
PG_FUNCTION_INFO_V1(trimmed_stddev_int64);
PG_FUNCTION_INFO_V1(trimmed_stddev_numeric);
Datum trimmed_stddev_double(PG_FUNCTION_ARGS);
Datum trimmed_stddev_int32(PG_FUNCTION_ARGS);
Datum trimmed_stddev_int64(PG_FUNCTION_ARGS);
Datum trimmed_stddev_numeric(PG_FUNCTION_ARGS);
/* population estimate */
PG_FUNCTION_INFO_V1(trimmed_stddev_pop_double);
PG_FUNCTION_INFO_V1(trimmed_stddev_pop_int32);
PG_FUNCTION_INFO_V1(trimmed_stddev_pop_int64);
PG_FUNCTION_INFO_V1(trimmed_stddev_pop_numeric);
Datum trimmed_stddev_pop_double(PG_FUNCTION_ARGS);
Datum trimmed_stddev_pop_int32(PG_FUNCTION_ARGS);
Datum trimmed_stddev_pop_int64(PG_FUNCTION_ARGS);
Datum trimmed_stddev_pop_numeric(PG_FUNCTION_ARGS);
/* sample estimate */
PG_FUNCTION_INFO_V1(trimmed_stddev_samp_double);
PG_FUNCTION_INFO_V1(trimmed_stddev_samp_int32);
PG_FUNCTION_INFO_V1(trimmed_stddev_samp_int64);
PG_FUNCTION_INFO_V1(trimmed_stddev_samp_numeric);
Datum trimmed_stddev_samp_double(PG_FUNCTION_ARGS);
Datum trimmed_stddev_samp_int32(PG_FUNCTION_ARGS);
Datum trimmed_stddev_samp_int64(PG_FUNCTION_ARGS);
Datum trimmed_stddev_samp_numeric(PG_FUNCTION_ARGS);
/* AVERAGE */
PG_FUNCTION_INFO_V1(trimmed_double_array);
PG_FUNCTION_INFO_V1(trimmed_int32_array);
PG_FUNCTION_INFO_V1(trimmed_int64_array);
PG_FUNCTION_INFO_V1(trimmed_numeric_array);
Datum trimmed_double_array(PG_FUNCTION_ARGS);
Datum trimmed_int32_array(PG_FUNCTION_ARGS);
Datum trimmed_int64_array(PG_FUNCTION_ARGS);
Datum trimmed_numeric_array(PG_FUNCTION_ARGS);
/* numeric helper */
static Numeric create_numeric(int value);
static Numeric add_numeric(Numeric a, Numeric b);
static Numeric sub_numeric(Numeric a, Numeric b);
static Numeric div_numeric(Numeric a, Numeric b);
static Numeric mul_numeric(Numeric a, Numeric b);
static Numeric pow_numeric(Numeric a, int b);
static Numeric sqrt_numeric(Numeric a);
Datum
trimmed_append_double(PG_FUNCTION_ARGS)
{
state_double *state;
MemoryContext aggcontext;
GET_AGG_CONTEXT("trimmed_append_double", fcinfo, aggcontext);
/*
* If both arguments are NULL, we can return NULL directly (instead of
* just allocating empty aggregate state even if we don't need it).
*/
if (PG_ARGISNULL(0) && PG_ARGISNULL(1))
PG_RETURN_NULL();
if (PG_ARGISNULL(0))
{
MemoryContext oldcontext = MemoryContextSwitchTo(aggcontext);
state = (state_double*)palloc(sizeof(state_double));
state->elements = (double*)palloc(MIN_ELEMENTS * sizeof(double));
MemoryContextSwitchTo(oldcontext);
state->maxelements = MIN_ELEMENTS;
state->nelements = 0;
state->sorted = false;
/* how much to cut */
if (PG_ARGISNULL(2) || PG_ARGISNULL(3))
elog(ERROR, "both upper and lower cut must not be NULL");
state->cut_lower = PG_GETARG_FLOAT8(2);
state->cut_upper = PG_GETARG_FLOAT8(3);
if (state->cut_lower < 0.0 || state->cut_lower >= 1.0)
elog(ERROR, "lower cut needs to be between 0 and 1 (inclusive)");
if (state->cut_upper < 0.0 || state->cut_upper >= 1.0)
elog(ERROR, "upper cut needs to be between 0 and 1 (inclusive)");
if (state->cut_lower + state->cut_upper >= 1.0)
elog(ERROR, "lower and upper cut sum to >= 1.0");
}
else
state = (state_double*)PG_GETARG_POINTER(0);
if (! PG_ARGISNULL(1))
{
double element = PG_GETARG_FLOAT8(1);
if (state->nelements >= state->maxelements)
{
state->maxelements *= 2;
state->elements = (double*)repalloc(state->elements,
sizeof(double) * state->maxelements);
}
state->elements[state->nelements++] = element;
}
Assert((state->nelements >= 0) && (state->nelements <= state->maxelements));
PG_RETURN_POINTER(state);
}
Datum
trimmed_append_int32(PG_FUNCTION_ARGS)
{
state_int32 *state;
MemoryContext aggcontext;
GET_AGG_CONTEXT("trimmed_append_int32", fcinfo, aggcontext);
/*
* If both arguments are NULL, we can return NULL directly (instead of
* just allocating empty aggregate state even if we don't need it).
*/
if (PG_ARGISNULL(0) && PG_ARGISNULL(1))
PG_RETURN_NULL();
if (PG_ARGISNULL(0))
{
MemoryContext oldcontext = MemoryContextSwitchTo(aggcontext);
state = (state_int32*)palloc(sizeof(state_int32));
state->elements = (int32*)palloc(MIN_ELEMENTS * sizeof(int32));
MemoryContextSwitchTo(oldcontext);
state->maxelements = MIN_ELEMENTS;
state->nelements = 0;
state->sorted = false;
/* how much to cut */
if (PG_ARGISNULL(2) || PG_ARGISNULL(3))
elog(ERROR, "both upper and lower cut must not be NULL");
state->cut_lower = PG_GETARG_FLOAT8(2);
state->cut_upper = PG_GETARG_FLOAT8(3);
if (state->cut_lower < 0.0 || state->cut_lower >= 1.0)
elog(ERROR, "lower cut needs to be between 0 and 1 (inclusive)");
if (state->cut_upper < 0.0 || state->cut_upper >= 1.0)
elog(ERROR, "upper cut needs to be between 0 and 1 (inclusive)");
if (state->cut_lower + state->cut_upper >= 1.0)
elog(ERROR, "lower and upper cut sum to >= 1.0");
}
else
state = (state_int32*)PG_GETARG_POINTER(0);
if (! PG_ARGISNULL(1))
{
int32 element = PG_GETARG_INT32(1);
if (state->nelements >= state->maxelements)
{
state->maxelements *= 2;
state->elements = (int32*)repalloc(state->elements,
sizeof(int32) * state->maxelements);
}
state->elements[state->nelements++] = element;
}
Assert((state->nelements >= 0) && (state->nelements <= state->maxelements));
PG_RETURN_POINTER(state);
}
Datum
trimmed_append_int64(PG_FUNCTION_ARGS)
{
state_int64 *state;
MemoryContext aggcontext;
GET_AGG_CONTEXT("trimmed_append_int64", fcinfo, aggcontext);
/*
* If both arguments are NULL, we can return NULL directly (instead of
* just allocating empty aggregate state even if we don't need it).
*/
if (PG_ARGISNULL(0) && PG_ARGISNULL(1))
PG_RETURN_NULL();
if (PG_ARGISNULL(0))
{
MemoryContext oldcontext = MemoryContextSwitchTo(aggcontext);
state = (state_int64*)palloc(sizeof(state_int64));
state->elements = (int64*)palloc(MIN_ELEMENTS * sizeof(int64));
MemoryContextSwitchTo(oldcontext);
state->maxelements = MIN_ELEMENTS;
state->nelements = 0;
state->sorted = false;
/* how much to cut */
if (PG_ARGISNULL(2) || PG_ARGISNULL(3))
elog(ERROR, "both upper and lower cut must not be NULL");
state->cut_lower = PG_GETARG_FLOAT8(2);
state->cut_upper = PG_GETARG_FLOAT8(3);
if (state->cut_lower < 0.0 || state->cut_lower >= 1.0)
elog(ERROR, "lower cut needs to be between 0 and 1 (inclusive)");
if (state->cut_upper < 0.0 || state->cut_upper >= 1.0)
elog(ERROR, "upper cut needs to be between 0 and 1 (inclusive)");
if (state->cut_lower + state->cut_upper >= 1.0)
elog(ERROR, "lower and upper cut sum to >= 1.0");
}
else
state = (state_int64*)PG_GETARG_POINTER(0);
if (! PG_ARGISNULL(1))
{
int64 element = PG_GETARG_INT64(1);
if (state->nelements >= state->maxelements)
{
state->maxelements *= 2;
state->elements = (int64*)repalloc(state->elements,
sizeof(int64) * state->maxelements);
}
state->elements[state->nelements++] = element;
}
Assert((state->nelements >= 0) && (state->nelements <= state->maxelements));
PG_RETURN_POINTER(state);
}
Datum
trimmed_append_numeric(PG_FUNCTION_ARGS)
{
state_numeric *state;
MemoryContext aggcontext;
GET_AGG_CONTEXT("trimmed_append_numeric", fcinfo, aggcontext);
/*
* If both arguments are NULL, we can return NULL directly (instead of
* just allocating empty aggregate state even if we don't need it).
*/
if (PG_ARGISNULL(0) && PG_ARGISNULL(1))
PG_RETURN_NULL();
if (PG_ARGISNULL(0))
{
state = (state_numeric*)MemoryContextAlloc(aggcontext,
sizeof(state_numeric));
state->nelements = 0;
state->data = NULL;
state->usedlen = 0;
state->maxlen = 32; /* TODO make this a constant */
state->sorted = false;
/* how much to cut */
if (PG_ARGISNULL(2) || PG_ARGISNULL(3))
elog(ERROR, "both upper and lower cut must not be NULL");
state->cut_lower = PG_GETARG_FLOAT8(2);
state->cut_upper = PG_GETARG_FLOAT8(3);
if (state->cut_lower < 0.0 || state->cut_lower >= 1.0)
elog(ERROR, "lower cut needs to be between 0 and 1 (inclusive)");
if (state->cut_upper < 0.0 || state->cut_upper >= 1.0)
elog(ERROR, "upper cut needs to be between 0 and 1 (inclusive)");
if (state->cut_lower + state->cut_upper >= 1.0)
elog(ERROR, "lower and upper cut sum to >= 1.0");
}
else
state = (state_numeric*)PG_GETARG_POINTER(0);
if (! PG_ARGISNULL(1))
{
Numeric element = PG_GETARG_NUMERIC(1);
int len = VARSIZE(element);
/* if there's not enough space in the data buffer, repalloc it */
if (state->usedlen + len > state->maxlen)
{
while (len + state->usedlen > state->maxlen)
state->maxlen *= 2;
if (state->data != NULL)
state->data = repalloc(state->data, state->maxlen);
}
/* if first entry, we need to allocate the buffer */
if (! state->data)
state->data = MemoryContextAlloc(aggcontext, state->maxlen);
/* copy the contents of the Numeric in place */
memcpy(state->data + state->usedlen, element, len);
state->usedlen += len;
state->nelements += 1;
}
Assert(state->usedlen <= state->maxlen);
Assert((!state->usedlen && !state->data) || (state->usedlen && state->data));
PG_RETURN_POINTER(state);
}
Datum
trimmed_serial_double(PG_FUNCTION_ARGS)
{
state_double *state = (state_double *)PG_GETARG_POINTER(0);
Size hlen = offsetof(state_double, elements); /* header */
Size len = state->nelements * sizeof(double); /* elements */
bytea *out = (bytea *)palloc(VARHDRSZ + len + hlen);
char *ptr;
CHECK_AGG_CONTEXT("trimmed_serial_double", fcinfo);
/* we want to serialize the data in sorted format */
sort_state_double(state);
SET_VARSIZE(out, VARHDRSZ + len + hlen);
ptr = VARDATA(out);
memcpy(ptr, state, offsetof(state_double, elements));
ptr += offsetof(state_double, elements);
memcpy(ptr, state->elements, len);
PG_RETURN_BYTEA_P(out);
}
Datum
trimmed_serial_int32(PG_FUNCTION_ARGS)
{
state_int32 *state = (state_int32 *)PG_GETARG_POINTER(0);
Size hlen = offsetof(state_int32, elements); /* header */
Size len = state->nelements * sizeof(int32); /* elements */
bytea *out = (bytea *)palloc(VARHDRSZ + len + hlen);
char *ptr;
CHECK_AGG_CONTEXT("trimmed_serial_int32", fcinfo);
/* we want to serialize the data in sorted format */
sort_state_int32(state);
SET_VARSIZE(out, VARHDRSZ + len + hlen);
ptr = VARDATA(out);
memcpy(ptr, state, offsetof(state_int32, elements));
ptr += offsetof(state_int32, elements);
memcpy(ptr, state->elements, len);
PG_RETURN_BYTEA_P(out);
}
Datum
trimmed_serial_int64(PG_FUNCTION_ARGS)
{
state_int64 *state = (state_int64 *)PG_GETARG_POINTER(0);
Size hlen = offsetof(state_int64, elements); /* header */
Size len = state->nelements * sizeof(int64); /* elements */
bytea *out = (bytea *)palloc(VARHDRSZ + len + hlen);
char *ptr;
CHECK_AGG_CONTEXT("trimmed_serial_int64", fcinfo);
/* we want to serialize the data in sorted format */
sort_state_int64(state);
SET_VARSIZE(out, VARHDRSZ + len + hlen);
ptr = VARDATA(out);
memcpy(ptr, state, offsetof(state_int64, elements));
ptr += offsetof(state_int64, elements);
memcpy(ptr, state->elements, len);
PG_RETURN_BYTEA_P(out);
}
Datum
trimmed_serial_numeric(PG_FUNCTION_ARGS)
{
state_numeric *state = (state_numeric *)PG_GETARG_POINTER(0);
Size hlen = offsetof(state_numeric, data); /* header */
Size len = state->usedlen; /* elements */
bytea *out;
char *ptr;
CHECK_AGG_CONTEXT("trimmed_serial_numeric", fcinfo);
out = (bytea *)palloc(VARHDRSZ + len + hlen);
SET_VARSIZE(out, VARHDRSZ + len + hlen);
ptr = (char*) VARDATA(out);
/* we want to serialize the data in sorted format */
sort_state_numeric(state);
/* now copy as a single chunk */
memcpy(ptr, state, offsetof(state_numeric, data));
ptr += offsetof(state_numeric, data);
memcpy(ptr, state->data, state->usedlen);
ptr += state->usedlen;
/* we better get exactly the expected amount of data */
Assert((char*)VARDATA(out) + len + hlen == ptr);
PG_RETURN_BYTEA_P(out);
}
Datum
trimmed_deserial_double(PG_FUNCTION_ARGS)
{
state_double *out = (state_double *)palloc(sizeof(state_double));
bytea *state = (bytea *)PG_GETARG_POINTER(0);
Size len PG_USED_FOR_ASSERTS_ONLY = VARSIZE_ANY_EXHDR(state);
char *ptr = VARDATA(state);
CHECK_AGG_CONTEXT("trimmed_deserial_double", fcinfo);
Assert(len > 0);
Assert((len - offsetof(state_double, elements)) % sizeof(double) == 0);
/* copy the header */
memcpy(out, ptr, offsetof(state_double, elements));
ptr += offsetof(state_double, elements);
Assert((out->nelements > 0) && (out->maxelements >= out->nelements));
Assert(len == offsetof(state_double, elements) + out->nelements * sizeof(double));
Assert(out->sorted);
/* we only allocate the necessary space */
out->elements = (double *)palloc(out->nelements * sizeof(double));
out->maxelements = out->nelements;
memcpy((void *)out->elements, ptr, out->nelements * sizeof(double));
PG_RETURN_POINTER(out);
}
Datum
trimmed_deserial_int32(PG_FUNCTION_ARGS)
{
state_int32 *out = (state_int32 *)palloc(sizeof(state_int32));
bytea *state = (bytea *)PG_GETARG_POINTER(0);
Size len PG_USED_FOR_ASSERTS_ONLY = VARSIZE_ANY_EXHDR(state);
char *ptr = VARDATA(state);
CHECK_AGG_CONTEXT("trimmed_deserial_int32", fcinfo);
Assert(len > 0);
Assert((len - offsetof(state_int32, elements)) % sizeof(int32) == 0);
/* copy the header */
memcpy(out, ptr, offsetof(state_int32, elements));
ptr += offsetof(state_int32, elements);
Assert((out->nelements > 0) && (out->maxelements >= out->nelements));
Assert(len == offsetof(state_int32, elements) + out->nelements * sizeof(int32));
Assert(out->sorted);
/* we only allocate the necessary space */
out->elements = (int32 *)palloc(out->nelements * sizeof(int32));
out->maxelements = out->nelements;
memcpy((void *)out->elements, ptr, out->nelements * sizeof(int32));
PG_RETURN_POINTER(out);
}
Datum
trimmed_deserial_int64(PG_FUNCTION_ARGS)
{
state_int64 *out = (state_int64 *)palloc(sizeof(state_int64));
bytea *state = (bytea *) PG_GETARG_POINTER(0);
Size len PG_USED_FOR_ASSERTS_ONLY = VARSIZE_ANY_EXHDR(state);
char *ptr = VARDATA(state);
CHECK_AGG_CONTEXT("trimmed_deserial_int64", fcinfo);
Assert(len > 0);
Assert((len - offsetof(state_int64, elements)) % sizeof(int32) == 0);
/* copy the header */
memcpy(out, ptr, offsetof(state_int64, elements));
ptr += offsetof(state_int64, elements);
Assert((out->nelements > 0) && (out->maxelements >= out->nelements));
Assert(len == offsetof(state_int64, elements) + out->nelements * sizeof(int64));
Assert(out->sorted);
/* we only allocate the necessary space */
out->elements = (int64 *)palloc(out->nelements * sizeof(int64));
out->maxelements = out->nelements;
memcpy((void *)out->elements, ptr, out->nelements * sizeof(int64));
PG_RETURN_POINTER(out);
}
Datum
trimmed_deserial_numeric(PG_FUNCTION_ARGS)
{
state_numeric *out = (state_numeric *)palloc(sizeof(state_numeric));
bytea *state = (bytea *)PG_GETARG_POINTER(0);
Size len = VARSIZE_ANY_EXHDR(state);
char *ptr = VARDATA(state);
CHECK_AGG_CONTEXT("trimmed_deserial_numeric", fcinfo);
Assert(len > 0);
/* first read the struct header, stored at the beginning */
memcpy(out, ptr, offsetof(state_numeric, data));
ptr += offsetof(state_numeric, data);
/* we don't serialize empty groups (we keep the state NULL) */
Assert((out->nelements > 0) && (out->usedlen > 0));
Assert(out->usedlen <= out->maxlen);
Assert(out->usedlen == (len - offsetof(state_numeric, data)));
Assert(out->sorted);
/* fist copy the Numeric values into the buffer */
out->data = palloc(len - offsetof(state_numeric, data));
memcpy(out->data, ptr, len - offsetof(state_numeric, data));
PG_RETURN_POINTER(out);
}
Datum
trimmed_combine_double(PG_FUNCTION_ARGS)
{
int i, j, k;
double *tmp;
state_double *state1;
state_double *state2;
MemoryContext agg_context;
MemoryContext old_context;
GET_AGG_CONTEXT("trimmed_combine_double", fcinfo, agg_context);
state1 = PG_ARGISNULL(0) ? NULL : (state_double *) PG_GETARG_POINTER(0);
state2 = PG_ARGISNULL(1) ? NULL : (state_double *) PG_GETARG_POINTER(1);
if (state2 == NULL)
PG_RETURN_POINTER(state1);
if (state1 == NULL)
{
old_context = MemoryContextSwitchTo(agg_context);
state1 = (state_double *)palloc(sizeof(state_double));
state1->maxelements = state2->maxelements;
state1->nelements = state2->nelements;
state1->cut_lower = state2->cut_lower;
state1->cut_upper = state2->cut_upper;
state1->sorted = state2->sorted;
state1->elements = (double*)palloc(sizeof(double) * state2->maxelements);
memcpy(state1->elements, state2->elements, sizeof(double) * state2->maxelements);
MemoryContextSwitchTo(old_context);
PG_RETURN_POINTER(state1);
}
Assert((state1 != NULL) && (state2 != NULL));
/* make sure both states are sorted */
sort_state_double(state1);
sort_state_double(state2);
tmp = (double*)MemoryContextAlloc(agg_context,
sizeof(double) * (state1->nelements + state2->nelements));
/* merge the two arrays */
i = j = k = 0;
while (true)
{
Assert(k <= (state1->nelements + state2->nelements));
Assert((i <= state1->nelements) && (j <= state2->nelements));
if ((i < state1->nelements) && (j < state2->nelements))
{
if (state1->elements[i] <= state2->elements[j])
tmp[k++] = state1->elements[i++];
else
tmp[k++] = state2->elements[j++];
}
else if (i < state1->nelements)
tmp[k++] = state1->elements[i++];
else if (j < state2->nelements)
tmp[k++] = state2->elements[j++];
else
/* no more elements to process */
break;
}
Assert(k == (state1->nelements + state2->nelements));
Assert((i == state1->nelements) && (j == state2->nelements));
/* free the two arrays */
pfree(state1->elements);
state1->elements = tmp;
/* and finally remember the current number of elements */
state1->nelements += state2->nelements;
state1->maxelements = state1->nelements;
PG_RETURN_POINTER(state1);
}
Datum
trimmed_combine_int32(PG_FUNCTION_ARGS)
{
int i, j, k;
int32 *tmp;
state_int32 *state1;
state_int32 *state2;
MemoryContext agg_context;
MemoryContext old_context;
GET_AGG_CONTEXT("trimmed_combine_int32", fcinfo, agg_context);
state1 = PG_ARGISNULL(0) ? NULL : (state_int32 *) PG_GETARG_POINTER(0);
state2 = PG_ARGISNULL(1) ? NULL : (state_int32 *) PG_GETARG_POINTER(1);
if (state2 == NULL)
PG_RETURN_POINTER(state1);
if (state1 == NULL)
{
old_context = MemoryContextSwitchTo(agg_context);
state1 = (state_int32 *)palloc(sizeof(state_int32));
state1->maxelements = state2->maxelements;
state1->nelements = state2->nelements;
state1->cut_lower = state2->cut_lower;
state1->cut_upper = state2->cut_upper;
state1->sorted = state2->sorted;
state1->elements = (int32*)palloc(sizeof(int32) * state2->maxelements);
memcpy(state1->elements, state2->elements, sizeof(int32) * state2->maxelements);
MemoryContextSwitchTo(old_context);
PG_RETURN_POINTER(state1);
}
Assert((state1 != NULL) && (state2 != NULL));
/* make sure both states are sorted */
sort_state_int32(state1);
sort_state_int32(state2);
tmp = (int32*)MemoryContextAlloc(agg_context,
sizeof(int32) * (state1->nelements + state2->nelements));
/* merge the two arrays */
i = j = k = 0;
while (true)
{
Assert(k <= (state1->nelements + state2->nelements));
Assert((i <= state1->nelements) && (j <= state2->nelements));
if ((i < state1->nelements) && (j < state2->nelements))
{
if (state1->elements[i] <= state2->elements[j])
tmp[k++] = state1->elements[i++];
else
tmp[k++] = state2->elements[j++];
}
else if (i < state1->nelements)
tmp[k++] = state1->elements[i++];
else if (j < state2->nelements)
tmp[k++] = state2->elements[j++];
else
/* no more elements to process */
break;
}
Assert(k == (state1->nelements + state2->nelements));
Assert((i == state1->nelements) && (j == state2->nelements));
/* free the two arrays */
pfree(state1->elements);
state1->elements = tmp;
/* and finally remember the current number of elements */
state1->nelements += state2->nelements;
state1->maxelements = state1->nelements;
PG_RETURN_POINTER(state1);
}
Datum
trimmed_combine_int64(PG_FUNCTION_ARGS)
{
int i, j, k;
int64 *tmp;
state_int64 *state1;
state_int64 *state2;
MemoryContext agg_context;
MemoryContext old_context;
GET_AGG_CONTEXT("trimmed_combine_int64", fcinfo, agg_context);
state1 = PG_ARGISNULL(0) ? NULL : (state_int64 *) PG_GETARG_POINTER(0);
state2 = PG_ARGISNULL(1) ? NULL : (state_int64 *) PG_GETARG_POINTER(1);
if (state2 == NULL)
PG_RETURN_POINTER(state1);
if (state1 == NULL)
{
old_context = MemoryContextSwitchTo(agg_context);
state1 = (state_int64 *)palloc(sizeof(state_int64));
state1->maxelements = state2->maxelements;
state1->nelements = state2->nelements;
state1->cut_lower = state2->cut_lower;
state1->cut_upper = state2->cut_upper;
state1->sorted = state2->sorted;
state1->elements = (int64*)palloc(sizeof(int64) * state2->maxelements);
memcpy(state1->elements, state2->elements, sizeof(int64) * state2->maxelements);
MemoryContextSwitchTo(old_context);
PG_RETURN_POINTER(state1);
}
Assert((state1 != NULL) && (state2 != NULL));
/* make sure both states are sorted */
sort_state_int64(state1);
sort_state_int64(state2);
tmp = (int64*)MemoryContextAlloc(agg_context,
sizeof(int64) * (state1->nelements + state2->nelements));
/* merge the two arrays */