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Remove EState.es_range_table_array.

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Now that list_nth is O(1), there's no good reason to maintain a
separate array of RTE pointers rather than indexing into
estate->es_range_table.  Deleting the array doesn't save all that
much either; but just on cleanliness grounds, it's better not to
have duplicate representations of the identical information.

Discussion: https://postgr.es/m/14960.1565384592@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2019-08-12 11:58:35 -04:00
parent 5ee190f8ec
commit 3c926587b5
4 changed files with 6 additions and 22 deletions
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1
src/backend/executor/execMain.c
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@ -2790,7 +2790,6 @@ EvalPlanQualStart(EPQState *epqstate, EState *parentestate, Plan *planTree)
estate->es_snapshot = parentestate->es_snapshot;
estate->es_crosscheck_snapshot = parentestate->es_crosscheck_snapshot;
estate->es_range_table = parentestate->es_range_table;
estate->es_range_table_array = parentestate->es_range_table_array;
estate->es_range_table_size = parentestate->es_range_table_size;
estate->es_relations = parentestate->es_relations;
estate->es_queryEnv = parentestate->es_queryEnv;

23
src/backend/executor/execUtils.c
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@ -113,7 +113,6 @@ CreateExecutorState(void)
estate->es_snapshot = InvalidSnapshot; /* caller must initialize this */
estate->es_crosscheck_snapshot = InvalidSnapshot; /* no crosscheck */
estate->es_range_table = NIL;
estate->es_range_table_array = NULL;
estate->es_range_table_size = 0;
estate->es_relations = NULL;
estate->es_rowmarks = NULL;
@ -720,29 +719,17 @@ ExecOpenScanRelation(EState *estate, Index scanrelid, int eflags)
* ExecInitRangeTable
* Set up executor's range-table-related data
*
* We build an array from the range table list to allow faster lookup by RTI.
* (The es_range_table field is now somewhat redundant, but we keep it to
* avoid breaking external code unnecessarily.)
* This is also a convenient place to set up the parallel es_relations array.
* In addition to the range table proper, initialize arrays that are
* indexed by rangetable index.
*/
void
ExecInitRangeTable(EState *estate, List *rangeTable)
{
Index rti;
ListCell *lc;
/* Remember the range table List as-is */
estate->es_range_table = rangeTable;
/* Set up the equivalent array representation */
/* Set size of associated arrays */
estate->es_range_table_size = list_length(rangeTable);
estate->es_range_table_array = (RangeTblEntry **)
palloc(estate->es_range_table_size * sizeof(RangeTblEntry *));
rti = 0;
foreach(lc, rangeTable)
{
estate->es_range_table_array[rti++] = lfirst_node(RangeTblEntry, lc);
}
/*
* Allocate an array to store an open Relation corresponding to each
@ -753,8 +740,8 @@ ExecInitRangeTable(EState *estate, List *rangeTable)
palloc0(estate->es_range_table_size * sizeof(Relation));
/*
* es_rowmarks is also parallel to the es_range_table_array, but it's
* allocated only if needed.
* es_rowmarks is also parallel to the es_range_table, but it's allocated
* only if needed.
*/
estate->es_rowmarks = NULL;
}

3
src/include/executor/executor.h
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@ -535,8 +535,7 @@ extern void ExecInitRangeTable(EState *estate, List *rangeTable);
static inline RangeTblEntry *
exec_rt_fetch(Index rti, EState *estate)
{
Assert(rti > 0 && rti <= estate->es_range_table_size);
return estate->es_range_table_array[rti - 1];
return (RangeTblEntry *) list_nth(estate->es_range_table, rti - 1);
}
extern Relation ExecGetRangeTableRelation(EState *estate, Index rti);

1
src/include/nodes/execnodes.h
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@ -502,7 +502,6 @@ typedef struct EState
Snapshot es_snapshot; /* time qual to use */
Snapshot es_crosscheck_snapshot; /* crosscheck time qual for RI */
List *es_range_table; /* List of RangeTblEntry */
struct RangeTblEntry **es_range_table_array; /* equivalent array */
Index es_range_table_size; /* size of the range table arrays */
Relation *es_relations; /* Array of per-range-table-entry Relation
* pointers, or NULL if not yet opened */