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Change do_tup_output() to take Datum/isnull arrays instead of a char * array,
so it doesn't go through BuildTupleFromCStrings. This is more or less a wash for current uses, but will avoid inefficiency for planned changes to EXPLAIN. Robert Haas
This commit is contained in:
Tom Lane
parent
ea382424ee
commit
846c364dd4
@ -15,7 +15,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.107 2009/06/11 14:48:57 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/executor/execTuples.c,v 1.108 2009/07/22 17:00:20 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -95,6 +95,7 @@
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#include "catalog/pg_type.h"
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#include "nodes/nodeFuncs.h"
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#include "storage/bufmgr.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/typcache.h"
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@ -1195,7 +1196,7 @@ BuildTupleFromCStrings(AttInMetadata *attinmeta, char **values)
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* Functions for sending tuples to the frontend (or other specified destination)
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* as though it is a SELECT result. These are used by utility commands that
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* need to project directly to the destination and don't need or want full
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* Table Function capability. Currently used by EXPLAIN and SHOW ALL
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* table function capability. Currently used by EXPLAIN and SHOW ALL.
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*/
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TupOutputState *
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begin_tup_output_tupdesc(DestReceiver *dest, TupleDesc tupdesc)
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@ -1204,7 +1205,6 @@ begin_tup_output_tupdesc(DestReceiver *dest, TupleDesc tupdesc)
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tstate = (TupOutputState *) palloc(sizeof(TupOutputState));
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tstate->metadata = TupleDescGetAttInMetadata(tupdesc);
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tstate->slot = MakeSingleTupleTableSlot(tupdesc);
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tstate->dest = dest;
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@ -1216,17 +1216,17 @@ begin_tup_output_tupdesc(DestReceiver *dest, TupleDesc tupdesc)
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/*
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* write a single tuple
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*
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* values is a list of the external C string representations of the values
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* to be projected.
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*
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* XXX This could be made more efficient, since in reality we probably only
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* need a virtual tuple.
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*/
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void
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do_tup_output(TupOutputState *tstate, char **values)
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do_tup_output(TupOutputState *tstate, Datum *values, bool *isnull)
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{
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/* build a tuple from the input strings using the tupdesc */
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HeapTuple tuple = BuildTupleFromCStrings(tstate->metadata, values);
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TupleDesc tupdesc = tstate->slot->tts_tupleDescriptor;
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HeapTuple tuple;
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/* form a tuple */
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tuple = heap_form_tuple(tupdesc, values, isnull);
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/* put it in a slot */
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ExecStoreTuple(tuple, tstate->slot, InvalidBuffer, true);
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@ -1241,24 +1241,34 @@ do_tup_output(TupOutputState *tstate, char **values)
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/*
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* write a chunk of text, breaking at newline characters
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*
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* NB: scribbles on its input!
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*
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* Should only be used with a single-TEXT-attribute tupdesc.
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*/
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void
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do_text_output_multiline(TupOutputState *tstate, char *text)
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{
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Datum values[1];
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bool isnull[1] = { false };
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while (*text)
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{
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char *eol;
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int len;
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eol = strchr(text, '\n');
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if (eol)
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*eol++ = '\0';
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{
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len = eol - text;
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eol++;
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}
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else
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eol = text +strlen(text);
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{
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len = strlen(text);
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eol += len;
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}
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do_tup_output(tstate, &text);
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values[0] = PointerGetDatum(cstring_to_text_with_len(text, len));
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do_tup_output(tstate, values, isnull);
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pfree(DatumGetPointer(values[0]));
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text = eol;
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}
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}
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@ -1269,6 +1279,5 @@ end_tup_output(TupOutputState *tstate)
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(*tstate->dest->rShutdown) (tstate->dest);
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/* note that destroying the dest is not ours to do */
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ExecDropSingleTupleTableSlot(tstate->slot);
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/* XXX worth cleaning up the attinmetadata? */
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pfree(tstate);
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}
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@ -10,7 +10,7 @@
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.508 2009/07/16 20:55:44 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.509 2009/07/22 17:00:23 tgl Exp $
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*
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*--------------------------------------------------------------------
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*/
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@ -5986,7 +5986,8 @@ ShowAllGUCConfig(DestReceiver *dest)
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int i;
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TupOutputState *tstate;
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TupleDesc tupdesc;
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char *values[3];
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Datum values[3];
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bool isnull[3] = { false, false, false };
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/* need a tuple descriptor representing three TEXT columns */
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tupdesc = CreateTemplateTupleDesc(3, false);
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@ -5997,29 +5998,46 @@ ShowAllGUCConfig(DestReceiver *dest)
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
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TEXTOID, -1, 0);
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/* prepare for projection of tuples */
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tstate = begin_tup_output_tupdesc(dest, tupdesc);
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for (i = 0; i < num_guc_variables; i++)
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{
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struct config_generic *conf = guc_variables[i];
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char *setting;
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if ((conf->flags & GUC_NO_SHOW_ALL) ||
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((conf->flags & GUC_SUPERUSER_ONLY) && !am_superuser))
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continue;
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/* assign to the values array */
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values[0] = (char *) conf->name;
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values[1] = _ShowOption(conf, true);
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values[2] = (char *) conf->short_desc;
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values[0] = PointerGetDatum(cstring_to_text(conf->name));
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setting = _ShowOption(conf, true);
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if (setting)
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{
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values[1] = PointerGetDatum(cstring_to_text(setting));
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isnull[1] = false;
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}
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else
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{
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values[1] = PointerGetDatum(NULL);
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isnull[1] = true;
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}
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values[2] = PointerGetDatum(cstring_to_text(conf->short_desc));
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/* send it to dest */
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do_tup_output(tstate, values);
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do_tup_output(tstate, values, isnull);
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/* clean up */
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if (values[1] != NULL)
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pfree(values[1]);
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pfree(DatumGetPointer(values[0]));
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if (setting)
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{
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pfree(setting);
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pfree(DatumGetPointer(values[1]));
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}
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pfree(DatumGetPointer(values[2]));
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}
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end_tup_output(tstate);
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.156 2009/07/18 19:15:42 tgl Exp $
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* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.157 2009/07/22 17:00:23 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -223,15 +223,13 @@ extern void UpdateChangedParamSet(PlanState *node, Bitmapset *newchg);
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typedef struct TupOutputState
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{
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/* use "struct" here to allow forward reference */
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struct AttInMetadata *metadata;
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TupleTableSlot *slot;
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DestReceiver *dest;
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} TupOutputState;
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extern TupOutputState *begin_tup_output_tupdesc(DestReceiver *dest,
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TupleDesc tupdesc);
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extern void do_tup_output(TupOutputState *tstate, char **values);
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extern void do_tup_output(TupOutputState *tstate, Datum *values, bool *isnull);
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extern void do_text_output_multiline(TupOutputState *tstate, char *text);
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extern void end_tup_output(TupOutputState *tstate);
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@ -240,11 +238,14 @@ extern void end_tup_output(TupOutputState *tstate);
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*
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* Should only be used with a single-TEXT-attribute tupdesc.
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*/
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#define do_text_output_oneline(tstate, text_to_emit) \
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#define do_text_output_oneline(tstate, str_to_emit) \
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do { \
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char *values_[1]; \
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values_[0] = (text_to_emit); \
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do_tup_output(tstate, values_); \
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Datum values_[1]; \
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bool isnull_[1]; \
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values_[0] = PointerGetDatum(cstring_to_text(str_to_emit)); \
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isnull_[0] = false; \
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do_tup_output(tstate, values_, isnull_); \
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pfree(DatumGetPointer(values_[0])); \
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} while (0)
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