AnnXie2001 opened a new issue, #2193:
URL: https://github.com/apache/age/issues/2193
**Describe the bug**
create … with … The execution plan of match is abnormal.
**How are you accessing AGE (Command line, driver, etc.)?**
- Command line
**What data setup do we need to do?**
psql
CREATE EXTENSION IF NOT EXISTS age;
LOAD 'age';
SET search_path = ag_catalog, "$user", public;
SELECT * FROM ag_catalog.create_graph('test_graph');
**What is the command that caused the error?**
SELECT * FROM cypher('test_graph', $$
CREATE
(a:Person {name: 'Jane', livesIn: 'London'}),
(b:Person {name: 'Tom', livesIn: 'Copenhagen'})
WITH a, b
MATCH (p:Person)
RETURN p.name
$$) AS (result agtype);
The first execution plan was different from the subsequent ones. The vertex
was not created in the first attempt.
**Expected behavior**
The vertex creates in the first attempt.
**Environment (please complete the following information):**
- Version: postgresql 15.7
age 1.5.0
**Additional context**
postgres=# SELECT * FROM ag_catalog.create_graph('test_graph');
EXPLAIN SELECT * FROM ag_catalog.cypher('test_graNOTICE: graph "test_graph"
has been created
create_graph
--------------
(1 row)
ppostgres=# EXPLAIN SELECT * FROM ag_catalog.cypher('test_graph', $
postgres$# CREATE
postgres$# (a:Person {name: 'Jane', livesIn: 'London'}),
postgres$# (b:Person {name: 'Tom', livesIn: 'Copenhagen'})
postgres$# WITH a, b
postgres$# MATCH (p:Person)
postgres$# RETURN p.name
postgres$# $) AS (result ag_catalog.agtype);
QUERY PLAN
-------------------------------------------
Result (cost=0.00..0.00 rows=0 width=32)
One-Time Filter: false
(2 rows)
postgres=# EXPLAIN SELECT * FROM ag_catalog.cypher('test_graph', $
CREATE
(a:Person {name: 'Jane', livesIn: 'London'}),
(b:Person {name: 'Tom', livesIn: 'Copenhagen'})
WITH a, b
MATCH (p:Person)
RETURN p.name
$) AS (result ag_catalog.agtype);
QUERY PLAN
----------------------------------------------------------------------------------------------------------
Nested Loop (cost=0.00..43.00 rows=1200 width=32)
-> Custom Scan (Cypher Create) (cost=0.00..0.00 rows=0 width=0)
-> Subquery Scan on _age_default_alias_previous_cypher_clause
(cost=0.00..0.03 rows=1 width=0)
-> Result (cost=0.00..0.02 rows=1 width=192)
-> Seq Scan on "Person" p (cost=0.00..22.00 rows=1200 width=40)
(5 rows)
The first time the stack of the plan is executed, ExecResult() directly
returns empty:
#0 ExecResult (pstate=0x559cf111fd18) at nodeResult.c:77
#1 0x0000559ce43043de in ExecProcNodeFirst (node=0x559cf111fd18) at
execProcnode.c:464
#2 0x0000559ce42f8ba3 in ExecProcNode (node=0x559cf111fd18) at
../../../src/include/executor/executor.h:262
#3 0x0000559ce42fb39f in ExecutePlan (estate=0x559cf111fab8,
planstate=0x559cf111fd18, use_parallel_mode=false, operation=CMD_SELECT,
sendTuples=true,
numberTuples=0, direction=ForwardScanDirection, dest=0x559cf10218c0,
execute_once=true) at execMain.c:1636
#4 0x0000559ce42f9121 in standard_ExecutorRun (queryDesc=0x559cf1009878,
direction=ForwardScanDirection, count=0, execute_once=true) at execMain.c:363
#5 0x0000559ce42f8fb1 in ExecutorRun (queryDesc=0x559cf1009878,
direction=ForwardScanDirection, count=0, execute_once=true) at execMain.c:307
#6 0x0000559ce452ff0c in PortalRunSelect (portal=0x559cf0f06ad8,
forward=true, count=0, dest=0x559cf10218c0) at pquery.c:924
#7 0x0000559ce452fb7a in PortalRun (portal=0x559cf0f06ad8,
count=9223372036854775807, isTopLevel=true, run_once=true, dest=0x559cf10218c0,
altdest=0x559cf10218c0,
qc=0x7ffd24d3f620) at pquery.c:768
#8 0x0000559ce4529376 in exec_simple_query (
query_string=0x559cf0e9b5c8 "SELECT * FROM
ag_catalog.cypher('test_graph', $\n CREATE\n (a:Person {name: 'Jane',
livesIn: 'London'}),\n (b:Person {name: 'Tom', livesIn: 'Copenhagen'})\n
WITH a, b\n MATCH (p:Person)\n RETUR"...) at postgres.c:1253
#9 0x0000559ce452dce6 in PostgresMain (dbname=0x559cf0ec69a8 "postgres",
username=0x559cf0e97c48 "gpadmin") at postgres.c:4615
#10 0x0000559ce446f6bc in BackendRun (port=0x559cf0ebc2e0) at
postmaster.c:4528
#11 0x0000559ce446efa1 in BackendStartup (port=0x559cf0ebc2e0) at
postmaster.c:4256
#12 0x0000559ce446b52a in ServerLoop () at postmaster.c:1823
#13 0x0000559ce446accd in PostmasterMain (argc=3, argv=0x559cf0e95b90) at
postmaster.c:1495
#14 0x0000559ce4374db4 in main (argc=3, argv=0x559cf0e95b90) at main.c:213
The stack of the second execution plan enters the function for creating
vertex:
#0 create_vertex (css=0x559cf1006498, node=0x559cf10067b8, next=0x0,
list=0x559cf1006c38) at src/backend/executor/cypher_create.c:498
#1 0x00007f2f500ae521 in process_pattern (css=0x559cf1006498) at
src/backend/executor/cypher_create.c:158
#2 0x00007f2f500ae6f4 in exec_cypher_create (node=0x559cf1006498) at
src/backend/executor/cypher_create.c:217
#3 0x0000559ce431f86a in ExecCustomScan (pstate=0x559cf1006498) at
nodeCustom.c:115
#4 0x0000559ce43043de in ExecProcNodeFirst (node=0x559cf1006498) at
execProcnode.c:464
#5 0x0000559ce4341598 in ExecProcNode (node=0x559cf1006498) at
../../../src/include/executor/executor.h:262
#6 0x0000559ce43417b6 in ExecNestLoop (pstate=0x559cf10062a8) at
nodeNestloop.c:109
#7 0x0000559ce43043de in ExecProcNodeFirst (node=0x559cf10062a8) at
execProcnode.c:464
#8 0x0000559ce42f8ba3 in ExecProcNode (node=0x559cf10062a8) at
../../../src/include/executor/executor.h:262
#9 0x0000559ce42fb39f in ExecutePlan (estate=0x559cf1006008,
planstate=0x559cf10062a8, use_parallel_mode=false, operation=CMD_SELECT,
sendTuples=true,
numberTuples=0, direction=ForwardScanDirection, dest=0x559cf1012c08,
execute_once=true) at execMain.c:1636
#10 0x0000559ce42f9121 in standard_ExecutorRun (queryDesc=0x559cf0f58be8,
direction=ForwardScanDirection, count=0, execute_once=true) at execMain.c:363
#11 0x0000559ce42f8fb1 in ExecutorRun (queryDesc=0x559cf0f58be8,
direction=ForwardScanDirection, count=0, execute_once=true) at execMain.c:307
#12 0x0000559ce452ff0c in PortalRunSelect (portal=0x559cf0f06ad8,
forward=true, count=0, dest=0x559cf1012c08) at pquery.c:924
#13 0x0000559ce452fb7a in PortalRun (portal=0x559cf0f06ad8,
count=9223372036854775807, isTopLevel=true, run_once=true, dest=0x559cf1012c08,
altdest=0x559cf1012c08,
qc=0x7ffd24d3f620) at pquery.c:768
#14 0x0000559ce4529376 in exec_simple_query (
query_string=0x559cf0e9b5c8 "SELECT * FROM
ag_catalog.cypher('test_graph', $\n CREATE\n (a:Person {name: 'Jane',
livesIn: 'London'}),\n (b:Person {name: 'Tom', livesIn: 'Copenhagen'})\n
WITH a, b\n MATCH (p:Person)\n RETUR"...) at postgres.c:1253
#15 0x0000559ce452dce6 in PostgresMain (dbname=0x559cf0ec69a8 "postgres",
username=0x559cf0e97c48 "gpadmin") at postgres.c:4615
#16 0x0000559ce446f6bc in BackendRun (port=0x559cf0ebc2e0) at
postmaster.c:4528
#17 0x0000559ce446efa1 in BackendStartup (port=0x559cf0ebc2e0) at
postmaster.c:4256
#18 0x0000559ce446b52a in ServerLoop () at postmaster.c:1823
#19 0x0000559ce446accd in PostmasterMain (argc=3, argv=0x559cf0e95b90) at
postmaster.c:1495
#20 0x0000559ce4374db4 in main (argc=3, argv=0x559cf0e95b90) at main.c:213
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