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Add optional compression method to SP-GiST

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Patch allows to have different types of column and value stored in leaf tuples
of SP-GiST. The main application of feature is to transform complex column type
to simple indexed type or for truncating too long value, transformation could
be lossy.  Simple example: polygons are converted to their bounding boxes,
this opclass follows.

Authors: me, Heikki Linnakangas, Alexander Korotkov, Nikita Glukhov
Reviewed-By: all authors + Darafei Praliaskouski
Discussions:
https://www.postgresql.org/message-id/5447B3FF.2080406@sigaev.ru
https://www.postgresql.org/message-id/flat/54907069.1030506@sigaev.ru#54907069.1030506@sigaev.ru
This commit is contained in:
Teodor Sigaev
2017-12-22 13:33:16 +03:00
parent 9373baa0f7
commit 854823fa33
7 changed files with 182 additions and 37 deletions
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6
src/backend/access/spgist/spgscan.c
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@@ -40,7 +40,7 @@ typedef struct ScanStackEntry
static void
freeScanStackEntry(SpGistScanOpaque so, ScanStackEntry *stackEntry)
{
if (!so->state.attType.attbyval &&
if (!so->state.attLeafType.attbyval &&
DatumGetPointer(stackEntry->reconstructedValue) != NULL)
pfree(DatumGetPointer(stackEntry->reconstructedValue));
if (stackEntry->traversalValue)
@@ -527,8 +527,8 @@ redirect:
if (out.reconstructedValues)
newEntry->reconstructedValue =
datumCopy(out.reconstructedValues[i],
so->state.attType.attbyval,
so->state.attType.attlen);
so->state.attLeafType.attbyval,
so->state.attLeafType.attlen);
else
newEntry->reconstructedValue = (Datum) 0;