!511 修复索引可见性问题

Merge pull request !511 from TotaJ/bugfix/parallel_cost

src/gausskernel/optimizer/util/plancat.cpp

@@ -251,11 +251,20 @@ void get_relation_info(PlannerInfo* root, Oid relationObjectId, bool inhparent,
              * mark the plan we are generating as transient. See
              * src/backend/access/heap/README.HOT for discussion.
              */
-            if (index->indcheckxmin && !TransactionIdPrecedes(HeapTupleGetRawXmin(indexRelation->rd_indextuple),
-                u_sess->utils_cxt.TransactionXmin)) {
-                root->glob->transientPlan = true;
-                index_close(indexRelation, NoLock);
-                continue;
+            if (index->indcheckxmin) {
+                TransactionId xmin = HeapTupleGetRawXmin(indexRelation->rd_indextuple);
+                if (!TransactionIdPrecedes(xmin, u_sess->utils_cxt.TransactionXmin)) {
+                    /*
+                     * Since the TransactionXmin won't advance immediately(see CalculateLocalLatestSnapshot),
+                     * we need to check CSN for the visibility.
+                     */
+                    CommitSeqNo csn = TransactionIdGetCommitSeqNo(xmin, true, true, false);
+                    if (csn >= u_sess->utils_cxt.CurrentSnapshot->snapshotcsn) {
+                        root->glob->transientPlan = true;
+                        index_close(indexRelation, NoLock);
+                        continue;
+                    }
+                }
             }
 
             info = makeNode(IndexOptInfo);

src/gausskernel/runtime/executor/opfusion_util.cpp

@@ -93,6 +93,10 @@ const char *getBypassReason(FusionType result)
             return "Bypass not executed because query used unsupported indexscan condition";
         }
 
+        case NOBYPASS_ONLY_SUPPORT_BTREE_INDEX: {
+            return "Bypass not executed because only support btree index currently";
+        }
+
         case NOBYPASS_INDEXONLYSCAN_WITH_ORDERBY: {
             return "Bypass not executed because query used indexonlyscan with order by clause method";
         }
@@ -438,12 +442,14 @@ template <bool is_dml, bool isonlyindex> FusionType checkFusionIndexScan(Node *n
     List *indexorderby = NULL;
     List *indexqual = NULL;
     List *qual = NULL;
+    Oid indexOid = InvalidOid;
+    Relation index = NULL;
     if (isonlyindex) {
         tarlist = ((IndexOnlyScan *)node)->scan.plan.targetlist;
         indexorderby = ((IndexOnlyScan *)node)->indexorderby;
         indexqual = ((IndexOnlyScan *)node)->indexqual;
         qual = ((IndexOnlyScan *)node)->scan.plan.qual;
-
+        indexOid = ((IndexOnlyScan *)node)->indexid;
         if (indexorderby != NULL) {
             return NOBYPASS_INDEXONLYSCAN_WITH_ORDERBY;
         }
@@ -452,12 +458,19 @@ template <bool is_dml, bool isonlyindex> FusionType checkFusionIndexScan(Node *n
         indexorderby = ((IndexScan *)node)->indexorderby;
         indexqual = ((IndexScan *)node)->indexqual;
         qual = ((IndexScan *)node)->scan.plan.qual;
-
+        indexOid = ((IndexScan *)node)->indexid;
         if (indexorderby != NULL) {
             return NOBYPASS_INDEXSCAN_WITH_ORDERBY;
         }
     }
 
+    index = index_open(indexOid, AccessShareLock);
+    if (index->rd_rel->relam != BTREE_AM_OID) {
+        index_close(index, AccessShareLock);
+        return NOBYPASS_ONLY_SUPPORT_BTREE_INDEX;
+    }
+    index_close(index, AccessShareLock);
+
     ListCell *lc = NULL;
 
     if (is_dml == false) {

src/include/opfusion/opfusion_util.h

@@ -68,6 +68,7 @@ enum FusionType {
     NOBYPASS_UPSERT_NOT_SUPPORT,
 
     NOBYPASS_NO_INDEXSCAN,
+    NOBYPASS_ONLY_SUPPORT_BTREE_INDEX,
     NOBYPASS_INDEXSCAN_WITH_ORDERBY,
     NOBYPASS_INDEXSCAN_WITH_QUAL,
     NOBYPASS_INDEXSCAN_CONDITION_INVALID,

src/test/regress/expected/create_index.out

@@ -619,10 +619,9 @@ EXPLAIN (NUM_NODES OFF, NODES OFF, COSTS OFF)
 SELECT * FROM point_tbl WHERE f1 IS NULL;
                QUERY PLAN                
 -----------------------------------------
- [Bypass]
  Index Scan using gpointind on point_tbl
    Index Cond: (f1 IS NULL)
-(3 rows)
+(2 rows)
 
 SELECT * FROM point_tbl WHERE f1 IS NULL;
  f1 
@@ -2748,3 +2747,33 @@ drop index test_table_idx1;
 drop index test_table_col_idx1;
 drop table test_table;
 drop table test_table_col;
+SET enable_seqscan=off;
+reset enable_indexscan;
+reset enable_bitmapscan;
+DROP TABLE IF EXISTS ddl_index_visibility;
+NOTICE:  table "ddl_index_visibility" does not exist, skipping
+CREATE TABLE ddl_index_visibility(id INT, first_name text, last_name text);
+--insert data
+INSERT INTO ddl_index_visibility SELECT id, md5(random()::text), md5(random()::text) FROM (SELECT * FROM generate_series(1,2000) AS id) AS x;
+--this update will produce a HOT, then the next created index need to check xmin when using it(get_relation_info)
+update ddl_index_visibility set first_name='+dw', last_name='dw_rt' where id = 698;
+--create index, indcheckxmin will be true
+create index ddl_index_visibility_idx on ddl_index_visibility USING btree(id);
+--explain, should be BitmapHeapScan
+explain(costs off) select * from ddl_index_visibility where id=698;
+                     QUERY PLAN                      
+-----------------------------------------------------
+ Bitmap Heap Scan on ddl_index_visibility
+   Recheck Cond: (id = 698)
+   ->  Bitmap Index Scan on ddl_index_visibility_idx
+         Index Cond: (id = 698)
+(4 rows)
+
+select * from ddl_index_visibility where id=698;
+ id  | first_name | last_name 
+-----+------------+-----------
+ 698 | +dw        | dw_rt
+(1 row)
+
+reset enable_seqscan;
+DROP TABLE ddl_index_visibility;

src/test/regress/expected/gpi_bitmapscan.out

@@ -293,18 +293,20 @@ drop index test_part_bitmapand_ginst_btree_a_idx;
 CREATE UNIQUE INDEX ON test_part_bitmapand_ginst_btree (a);
 --bitmapand scan
 explain (costs off) SELECT keyword FROM test_part_bitmapand_ginst_btree WHERE keyword @> 'new' and a = 10;
-                              QUERY PLAN
------------------------------------------------------------------------
+                                      QUERY PLAN                                       
+---------------------------------------------------------------------------------------
  Partition Iterator
    Iterations: 1
    ->  Partitioned Bitmap Heap Scan on test_part_bitmapand_ginst_btree
-         Recheck Cond: (keyword @> '''new'''::tsquery)
-         Filter: (a = 10)
+         Recheck Cond: ((keyword @> '''new'''::tsquery) AND (a = 10))
          Selected Partitions:  1
-         ->  Partitioned Bitmap Index Scan on qq
-               Index Cond: (keyword @> '''new'''::tsquery)
-               Selected Partitions:  1
-(9 rows)
+         ->  BitmapAnd
+               ->  Partitioned Bitmap Index Scan on qq
+                     Index Cond: (keyword @> '''new'''::tsquery)
+                     Selected Partitions:  1
+               ->  Bitmap Index Scan on test_part_bitmapand_ginst_btree_a_tableoid_idx
+                     Index Cond: (a = 10)
+(11 rows)
 
 SELECT keyword FROM test_part_bitmapand_ginst_btree WHERE keyword @> 'new' and a = 10;
     keyword

src/test/regress/sql/create_index.sql

@@ -968,3 +968,22 @@ drop index test_table_idx1;
 drop index test_table_col_idx1;
 drop table test_table;
 drop table test_table_col;
+
+SET enable_seqscan=off;
+reset enable_indexscan;
+reset enable_bitmapscan;
+
+DROP TABLE IF EXISTS ddl_index_visibility;
+CREATE TABLE ddl_index_visibility(id INT, first_name text, last_name text);
+--insert data
+INSERT INTO ddl_index_visibility SELECT id, md5(random()::text), md5(random()::text) FROM (SELECT * FROM generate_series(1,2000) AS id) AS x;
+--this update will produce a HOT, then the next created index need to check xmin when using it(get_relation_info)
+update ddl_index_visibility set first_name='+dw', last_name='dw_rt' where id = 698;
+--create index, indcheckxmin will be true
+create index ddl_index_visibility_idx on ddl_index_visibility USING btree(id);
+--explain, should be BitmapHeapScan
+explain(costs off) select * from ddl_index_visibility where id=698;
+select * from ddl_index_visibility where id=698;
+
+reset enable_seqscan;
+DROP TABLE ddl_index_visibility;