Re: [WIP]Vertical Clustered Index (columnar store extension) - take2

On Mon, 2025-08-11 at 17:39 +0800, Japin Li wrote:
>
> 1.
> +static struct
> +{
> +    int         transfn_oid;    /* Transition function's funcoid.
> Arrays are
> +                                 * sorted in ascending order */
> +    Oid         transtype;      /* Transition data type */
> +    PGFunction  merge_trans;    /* Function pointer set required for
> parallel
> +                                 * aggregation for each transfn_oid
> */
> +    vci_aggtranstype_kind kind; /* If transtype is INTERNALOID, its
> details */
> +}           trans_funcs_table[] = {
> +    {F_FLOAT4_ACCUM, 1022, merge_floatX_accum,
> VCI_AGG_NOT_INTERNAL},   /* 208 */
> +    {F_FLOAT8_ACCUM, 1022, merge_floatX_accum,
> VCI_AGG_NOT_INTERNAL},   /* 222 */
> +    {F_INT8INC, 20, int8pl, VCI_AGG_NOT_INTERNAL},  /* 1833 */
> +    {F_NUMERIC_ACCUM, 2281, numeric_combine,
> VCI_AGG_NUMERIC_AGG_STATE},    /* 1834 */
> +    {F_INT2_ACCUM, 2281, numeric_poly_combine,
> VCI_AGG_POLY_NUM_AGG_STATE}, /* 1836 */
> +    {F_INT4_ACCUM, 2281, numeric_poly_combine,
> VCI_AGG_POLY_NUM_AGG_STATE}, /* 1835 */
> +    {F_INT8_ACCUM, 2281, numeric_combine,
> VCI_AGG_NUMERIC_AGG_STATE},   /* 1836 */
> +    {F_INT2_SUM, 20, int8pl, VCI_AGG_NOT_INTERNAL}, /* 1840 */
> +    {F_INT4_SUM, 20, int8pl, VCI_AGG_NOT_INTERNAL}, /* 1841 */
> +    {F_INTERVAL_AVG_COMBINE, 2281, merge_interval_avg_accum,
> VCI_AGG_NOT_INTERNAL}, /* 3325 */
> +    {F_INT2_AVG_ACCUM, 1016, merge_intX_accum,
> VCI_AGG_NOT_INTERNAL},   /* 1962 */
> +    {F_INT4_AVG_ACCUM, 1016, merge_intX_accum,
> VCI_AGG_NOT_INTERNAL},   /* 1963 */
> +    {F_INT8INC_ANY, 20, int8pl, VCI_AGG_NOT_INTERNAL},  /* 2804 */
> +    {F_INT8_AVG_ACCUM, 2281, int8_avg_combine,
> VCI_AGG_POLY_AVG_NUM_AGG_STATE}, /* 2746 */
> +    {F_NUMERIC_AVG_ACCUM, 2281, numeric_avg_combine,
> VCI_AGG_AVG_NUMERIC_AGG_STATE},    /* 2858 */
> +};
>
> The comments state that this is sorted in ascending order, but the
> code doesn't
> follow that rule. While the current linear search works, a future
> change to
> binary search could cause problems.
>

Hi Japin!
I've looked at the code, vci_set_merge_and_copy_trans_funcs() function
is unused and almost all code of vci_aggmergetranstype.c file including
trans_funcs_table[] can be either removed either replaced with simple
switch-case. Only transfn_oid fields of trans_funcs_table[] were
actually used. Here is my patch made on top of v17.

Peter, what do you think? Is it OK to remove those code?

--
Regards,
Timur Magomedov