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Create infrastructure for 'MinimalTuple' representation of in-memory

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tuples with less header overhead than a regular HeapTuple, per my
recent proposal.  Teach TupleTableSlot code how to deal with these.
As proof of concept, change tuplestore.c to store MinimalTuples instead
of HeapTuples.  Future patches will expand the concept to other places
where it is useful.
This commit is contained in:
Tom Lane
2006-06-27 02:51:40 +00:00
parent fe491fb9af
commit 3f50ba27cf
13 changed files with 558 additions and 129 deletions
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22
contrib/tablefunc/tablefunc.c
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@ -934,19 +934,16 @@ get_crosstab_tuplestore(char *sql,
*/
if (lastrowid != NULL)
{
/*
* switch to appropriate context while storing the tuple
*/
SPIcontext = MemoryContextSwitchTo(per_query_ctx);
/* rowid changed, flush the previous output row */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* switch to appropriate context while storing the tuple */
SPIcontext = MemoryContextSwitchTo(per_query_ctx);
tuplestore_puttuple(tupstore, tuple);
MemoryContextSwitchTo(SPIcontext);
for (j = 0; j < result_ncols; j++)
xpfree(values[j]);
/* now reset the context */
MemoryContextSwitchTo(SPIcontext);
}
values[0] = rowid;
@ -970,16 +967,13 @@ get_crosstab_tuplestore(char *sql,
lastrowid = pstrdup(rowid);
}
/* switch to appropriate context while storing the tuple */
SPIcontext = MemoryContextSwitchTo(per_query_ctx);
/* flush the last output row */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* switch to appropriate context while storing the tuple */
SPIcontext = MemoryContextSwitchTo(per_query_ctx);
tuplestore_puttuple(tupstore, tuple);
/* now reset the context */
MemoryContextSwitchTo(SPIcontext);
}
if (SPI_finish() != SPI_OK_FINISH)