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Add sortsupport for gist_btree opclasses, for faster index builds.
Commit 16fa9b2b30
introduced a faster way to build GiST indexes, by
sorting all the data. This commit adds the sortsupport functions needed
to make use of that feature for btree_gist.
Author: Andrey Borodin
Discussion: https://www.postgresql.org/message-id/2F3F7265-0D22-44DB-AD71-8554C743D943@yandex-team.ru
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@ -23,6 +23,7 @@ PG_FUNCTION_INFO_V1(gbt_float8_consistent);
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PG_FUNCTION_INFO_V1(gbt_float8_distance);
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PG_FUNCTION_INFO_V1(gbt_float8_penalty);
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PG_FUNCTION_INFO_V1(gbt_float8_same);
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PG_FUNCTION_INFO_V1(gbt_float8_sortsupport);
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static bool
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@ -216,3 +217,79 @@ gbt_float8_same(PG_FUNCTION_ARGS)
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*result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
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PG_RETURN_POINTER(result);
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}
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static int
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gbt_float8_sort_build_cmp(Datum a, Datum b, SortSupport ssup)
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{
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float8KEY *ia = (float8KEY *) DatumGetPointer(a);
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float8KEY *ib = (float8KEY *) DatumGetPointer(b);
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/* for leaf items we expect lower == upper */
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Assert(ia->lower == ia->upper);
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Assert(ib->lower == ib->upper);
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if (ia->lower == ib->lower)
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return 0;
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return (ia->lower > ib->lower) ? 1 : -1;
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}
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static Datum
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gbt_float8_abbrev_convert(Datum original, SortSupport ssup)
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{
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float8KEY *b1 = (float8KEY *) DatumGetPointer(original);
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float8 z = b1->lower;
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#if SIZEOF_DATUM == 8
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return Float8GetDatum(z);
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#else
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return Float4GetDatum((float4) z);
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#endif
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}
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static int
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gbt_float8_cmp_abbrev(Datum z1, Datum z2, SortSupport ssup)
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{
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#if SIZEOF_DATUM == 8
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float8 a = DatumGetFloat8(z1);
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float8 b = DatumGetFloat8(z2);
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#else
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float4 a = DatumGetFloat4(z1);
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float4 b = DatumGetFloat4(z2);
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#endif
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if (a > b)
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return 1;
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else if (a < b)
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return -1;
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else
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return 0;
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}
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static bool
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gbt_float8_abbrev_abort(int memtupcount, SortSupport ssup)
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{
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return false;
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}
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/*
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* Sort support routine for fast GiST index build by sorting.
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*/
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Datum
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gbt_float8_sortsupport(PG_FUNCTION_ARGS)
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{
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SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
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if (ssup->abbreviate)
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{
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ssup->comparator = gbt_float8_cmp_abbrev;
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ssup->abbrev_converter = gbt_float8_abbrev_convert;
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ssup->abbrev_abort = gbt_float8_abbrev_abort;
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ssup->abbrev_full_comparator = gbt_float8_sort_build_cmp;
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}
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else
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{
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ssup->comparator = gbt_float8_sort_build_cmp;
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}
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PG_RETURN_VOID();
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}
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