arrayaccess.h File Reference

#include "access/tupmacs.h"
#include "utils/array.h"

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Data Structures
struct	array_iter

Typedefs
typedef struct array_iter	array_iter

Functions
static void	array_iter_setup (array_iter *it, AnyArrayType *a)
static Datum	array_iter_next (array_iter *it, bool *isnull, int i, int elmlen, bool elmbyval, char elmalign)

Typedef Documentation

array_iter

typedef struct array_iter array_iter

Function Documentation

array_iter_next()

static Datum array_iter_next ( array_iter *  it, bool *  isnull, int  i, int  elmlen, bool  elmbyval, char  elmalign  )

inlinestatic

Definition at line 81 of file arrayaccess.h.

References att_addlength_pointer, att_align_nominal, array_iter::bitmapptr, array_iter::bitmask, array_iter::dataptr, array_iter::datumptr, fetch_att, i, and array_iter::isnullptr.

Referenced by array_cmp(), array_contain_compare(), array_eq(), array_map(), array_out(), array_send(), array_unnest(), hash_array(), and hash_array_extended().

{
    Datum       ret;

    if (it->datumptr)
    {
        ret = it->datumptr[i];
        *isnull = it->isnullptr ? it->isnullptr[i] : false;
    }
    else
    {
        if (it->bitmapptr && (*(it->bitmapptr) & it->bitmask) == 0)
        {
            *isnull = true;
            ret = (Datum) 0;
        }
        else
        {
            *isnull = false;
            ret = fetch_att(it->dataptr, elmbyval, elmlen);
            it->dataptr = att_addlength_pointer(it->dataptr, elmlen,
                                                it->dataptr);
            it->dataptr = (char *) att_align_nominal(it->dataptr, elmalign);
        }
        it->bitmask <<= 1;
        if (it->bitmask == 0x100)
        {
            if (it->bitmapptr)
                it->bitmapptr++;
            it->bitmask = 1;
        }
    }

    return ret;
}

array_iter_setup()

static void array_iter_setup ( array_iter *  it, AnyArrayType *  a  )

inlinestatic

Definition at line 49 of file arrayaccess.h.

References ARR_DATA_PTR, ARR_NULLBITMAP, array_iter::bitmapptr, array_iter::bitmask, array_iter::dataptr, array_iter::datumptr, ExpandedArrayHeader::dnulls, ExpandedArrayHeader::dvalues, ExpandedArrayHeader::fvalue, array_iter::isnullptr, VARATT_IS_EXPANDED_HEADER, and AnyArrayType::xpn.

Referenced by array_cmp(), array_contain_compare(), array_eq(), array_map(), array_out(), array_send(), array_unnest(), hash_array(), and hash_array_extended().

{
    if (VARATT_IS_EXPANDED_HEADER(a))
    {
        if (a->xpn.dvalues)
        {
            it->datumptr = a->xpn.dvalues;
            it->isnullptr = a->xpn.dnulls;
            /* we must fill all fields to prevent compiler warnings */
            it->dataptr = NULL;
            it->bitmapptr = NULL;
        }
        else
        {
            /* Work with flat array embedded in the expanded datum */
            it->datumptr = NULL;
            it->isnullptr = NULL;
            it->dataptr = ARR_DATA_PTR(a->xpn.fvalue);
            it->bitmapptr = ARR_NULLBITMAP(a->xpn.fvalue);
        }
    }
    else
    {
        it->datumptr = NULL;
        it->isnullptr = NULL;
        it->dataptr = ARR_DATA_PTR((ArrayType *) a);
        it->bitmapptr = ARR_NULLBITMAP((ArrayType *) a);
    }
    it->bitmask = 1;
}