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Not remove all paths, keep IndexPath's

pull/4950/head
Onur Tirtir 2021-06-01 10:43:51 +03:00
parent 1af50e98b3
commit 82ea1b5daf
1 changed files with 45 additions and 14 deletions
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59
src/backend/columnar/columnar_customscan.c
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@ -27,6 +27,7 @@
#include "columnar/columnar_customscan.h"
#include "columnar/columnar_metadata.h"
#include "columnar/columnar_tableam.h"
#include "distributed/listutils.h"
typedef struct ColumnarScanPath
{
@ -50,8 +51,13 @@ typedef struct ColumnarScanState
} ColumnarScanState;
typedef bool (*PathPredicate)(Path *path);
static void ColumnarSetRelPathlistHook(PlannerInfo *root, RelOptInfo *rel, Index rti,
RangeTblEntry *rte);
static void RemovePathsByPredicate(RelOptInfo *rel, PathPredicate removePathPredicate);
static bool IsNotIndexPath(Path *path);
static Path * CreateColumnarScanPath(PlannerInfo *root, RelOptInfo *rel,
RangeTblEntry *rte);
static Cost ColumnarScanCost(RangeTblEntry *rte);
@ -137,18 +143,6 @@ columnar_customscan_init()
}
static void
clear_paths(RelOptInfo *rel)
{
rel->pathlist = NIL;
rel->partial_pathlist = NIL;
rel->cheapest_startup_path = NULL;
rel->cheapest_total_path = NULL;
rel->cheapest_unique_path = NULL;
rel->cheapest_parameterized_paths = NIL;
}
static void
ColumnarSetRelPathlistHook(PlannerInfo *root, RelOptInfo *rel, Index rti,
RangeTblEntry *rte)
@ -188,8 +182,13 @@ ColumnarSetRelPathlistHook(PlannerInfo *root, RelOptInfo *rel, Index rti,
ereport(DEBUG1, (errmsg("pathlist hook for columnar table am")));
/* we propose a new path that will be the only path for scanning this relation */
clear_paths(rel);
/*
* TODO: Since we don't have a proper costing model for
* ColumnarCustomScan, we remove other paths to force postgres
* using ColumnarCustomScan. Note that we still keep index paths
* since they still might be useful.
*/
RemovePathsByPredicate(rel, IsNotIndexPath);
add_path(rel, customPath);
}
}
@ -197,6 +196,38 @@ ColumnarSetRelPathlistHook(PlannerInfo *root, RelOptInfo *rel, Index rti,
}
/*
* RemovePathsByPredicate removes the paths that removePathPredicate
* evaluates to true from pathlist of given rel.
*/
static void
RemovePathsByPredicate(RelOptInfo *rel, PathPredicate removePathPredicate)
{
List *filteredPathList = NIL;
Path *path = NULL;
foreach_ptr(path, rel->pathlist)
{
if (!removePathPredicate(path))
{
filteredPathList = lappend(filteredPathList, path);
}
}
rel->pathlist = filteredPathList;
}
/*
* IsNotIndexPath returns true if given path is not an IndexPath.
*/
static bool
IsNotIndexPath(Path *path)
{
return !IsA(path, IndexPath);
}
static Path *
CreateColumnarScanPath(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
{